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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
本习题练习试卷来源于51fly国际课程 (https://51fly.win)， 为试卷打印版，您也可以在网站平台(https://mail.51fly.win/)直接 访问本试卷的在线电子版并查看正确答案与解析，搜藏保存任意题目到收藏集。 访问方法: 平台首页左上角"通过试卷号快速访问"输入试卷号 80，并点击直达试卷；或浏览器地址栏内直接输入本试卷链接 https://mail.51fly.win/test80.html  教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。
 作者: physics    总分: 142分  得分: _____________

答题人: 游客未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units h75;(mpqui vhof magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states tkk l7y5 +xsxr4hat the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of change on ) lqqx-bv fbt:,i y-b7grwmefz673(b th xze7 lfb,b ibg-m(f)qt r -6wvy:b73qe induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field througia/g) 289bwb egeu i6p7upx g7h a loop of wire produces what kind of change on the ia b9bgp7/ueewg6 7 xu g)i2p8induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a looz) .x gz 7)ae1qfjhw5oc(+y b ytj;ouc41h/gop of wire produces what kind of change on the indu h)1fyq5/1.o(zoe j w) bytzjhxgo;g c cu7a+4ced $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a 5f3rl 7ghb)dm magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conet9rr 1m6x e2ny+b5bzductor will be that which tends to produce which of th2bt9ezxre5mby61+ nre following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal tab4: rgi 0u ld)pi6us+b a.usnk(le. A bar magnet is held above its center with its north pole pointing ds i +6b)ud(.lu n0aiguk4s:rp own. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bd1fz*zemh +b2ar magnet is held above its cent1 dm+2zhb*efz er with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector poi .8hva v;d(/x 4wq jtbwveb2;mnts straight up. The magnetic field vanishes suddenly. When viewv v .4b jtw edqwhbx;a;m(28v/ed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in:(l ywm7i50ykt hf*k l a region where the magnetic field vector points strai7 i:klthmwf*(0ly k5yght up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the maga /n2cmv /azy7netic field points straight doy72 cam/ nv/zawn. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-ioz b:m1lrzvuw*5w *eejqqk:(k0) ch. ncreasing current northward. Two coils of wire lie flat on the zlwr:wo.(m5qqcj k b*hve1 :0 e u)kz*table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering first. A)zqex9;y9qzkk l0y h, 7qfcp *s the north pole enters the wire, the induced current will be (as viewed from abov) qhk ky; pl0,qezc z79qx9*fye)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axisz 0stid5cep9 l9 h(hut/ j,u+z whose direction can be varied. In a region where a u(j uzc0z shhut9l+e /di59p,tniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at consthn 2*;z+dv-ciajnblx .k us/e7i0/lxant angular speed about an axis whose dirze+ijn.xba ;-7*sl c0/ivkld/x nu2h ection can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.fn69md /.uigu pp8rs6
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways th z:*tgcmfe uwq8z-f +,at an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a6q;-issvw, c i1a - m/ qdbb0awoe(1yk magnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-we/jmlwf 5+j 3 r dqii159zsh0ozst direction) is moved northward at constant velocity through a magnetic+1fh5lq oiwj di rzsz035/9mj field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant ,4bq+ 8mqfrtij m*hl( angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator t .pg pnp/t02xyy/nz8nransforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The z-fr 9sba+gjtqyzpkjt. y0+6wiy((1frequency of tgt.j6fy-(iks +1abz 09y+r(twq z pj yhe $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used vlg 3 v6x l,+5ifc+v-qk4sfy qto

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device thtc)k6zx: g7pjat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary n llmj7l03*0b 1px hwncoil contains more loops than the primary coil thexljnbll7* ph10n 0m3wn it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary comd 1v/+ ppwn:wil contains more loops than the secondary coil then it i vpd np/+1m:wws a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the n;h xqqme1-lmv 8g n*07asj o5power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circui p5-i 1qc(obh3oci co3t,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inds7g6mv4pro3q g+i+zo uctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the batterogo+gsmpz 37rqi 6v+4 y, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of cowj:,ez 9 vb knk13ccb70uznz 9nstant terminal voltage. At the moment contact is made wi zcb91kb9ej:uk 3nw zc zv,07nth the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L atoeex 8kkmfyj4)jm7 g4/tq21 nd resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R pr;lq,:zpt;fij-c4; gdi (bc l (qzm3is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battw7-t la j l7cd3/e,gmwery. The time constant for the circuit represents the tim t/l3c7m,-wgwl da 7eje required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series tz7fx(bw+k . ovo a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease k+owvfzx (.7bto

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have nx7 txyno1 ;rq7n/9anthe same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On thi.(xw 3x cuqn*c dy.jrqvxq760g 2 fg6ms circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an vy35-g)m, jyh tpfc)c AC power supply. In this circuit, the current 5y-y)hc)pfgm,3cvjt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what h-yt1f xsx -pka/( p/xfactor when the frequency ispxp- as k -h(/x1fx/yt tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the(w.r )nh i9jye 0m xr.:;srdar AC voltage across an inductor is doubled, the inductive reactance of thar:.e.0rs xm() ;rwy ja r9ndiht inductor

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本习题练习题目来源于51fly国际课程 (https://51fly.win)，学生可刷题练习，扫右侧二维码或加微信xxxxxxxxxx，获取更多资料
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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, the ig5ac: 3m7jwjog-l; 4jonm+ssnductijl 7 gsms g+ nwc4om3j;:5oja-ve reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supplg5w : :t/mxu g*d1cflhnwl* n-y. In this circuit, the currex*lf:15l/t* nn gwd-hgmuw c:nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what ull7bk1 by *cj(*b8-evk xlp, factor when the frequency is tri17*(bbpb lkc8xjlv,*kl eu-y pled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC vomo dw xndqhe,o;5-7b/en0gh2 z+iue e h;d6n7ltage across a capacitor approaches zero, the capacitive reactance of that capach2;5m,e -07gd+e;qwhduhnn 7x dezoeoi/ n6bitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle ( d7(to3o-ld+bi2 ywqqmj2se between the voltages of the inductor and capacitor in a RLC serwqdd (+ 23 l7( q-ooje2ymtisbies circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is define y(p0rbe*u0 7ew-x puld as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance o7*lkd a49t gyc+ 2wdiuf the circuit increases if R increases. When is this statdcy +ti9 27lg*duak 4wement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedan/qlje jr7a:gf0c)b 5 pce of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. Thrs rafk)r 9*y;m; 4upoe impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circu) coqz6pg9oa, it, the resonacp6a,oo)9g q znt frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by eo,ttl;q8ufq3ys77x bk8x:5ozj * oban AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series Rf uzjb45ygl( i;gf a68LC circuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rota;yykbxkq k, 26ting in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop andq26yy;kx,kk b the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a u.)edz5m7 frq -osn)xv niform magnetic field of 0.20 T. Find the 5qe).fvxmzr-7 sd )no magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of3 w.*,op+n /(f9bv llfbc vptx 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic p+ n/ lfwfvl3x.cotbpb9(v,*field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustabhsv:lsr 1 ep.cv,l6n7le single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes from ,d njc v7ve*), 0bg(ufn-yb om$4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides o b4u4a gmekys2r4 v+5uq3w0zw7gx u/ 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the inducedrbegmoakyzx74 q30g 5u2w4us v w/+ 4u $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an areaf1k,pm -ikf7oym+6 tu(tn6lm of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns andv r1uuh s2afh(x*4. z;gk r6dv area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizonti,1up )y5p io3rnyw/ xally at a location where the downward comrno)5u/y i31, ppx wyiponent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angular velocc:0xk cyx a8f(ity of 2.0 rad/s abou0k :(ayfxcxc8t a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generat5e )xf*cj4 1x(gsfb qlor has 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wirefl mneg4 5 ct(oat:5+z of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 re)l-thv7l8 i4i tx6 jbjctangular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a un4l)tbt7 x 6jivl8 j-hiiform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of a90dz r9uz2mw 1r1lxfh8 ypz9 vrea $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generb85 g fsg-od+vo)rsi 4ator with an output of 12 V m58f)bi -4dog vro+sgsaximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a genertqp8os n*/ c:g ;n3wafator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor opjb 209*s:cl5dxn*j;g . )gfzozryh j ierates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a r lt gdrd xje(lt6q583:esistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a ba ttdr(3j ll8q5xeg6 :dck $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a y*(dxime ,j, r n1gc 5rtm6cq*24-V power supply. The operating current is 1.0 A. What(rq ,g,dr5j6xmy *ien*ctm1c is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of interngdy480svd p q/al resistance 6.0 W is connected to a 24-V power supply. The operating current is sdp y/d0vg4q81.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. g469l-vtgkrk lnh 4;f0 jqt5r The operating current is 1.0 A at full speed. What is the back t 4l0-k5n6fr4kgqjt l;9ghrv$emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is m 1.t((doq+mvopug pjgq 1 avj5d+(r7needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transfo9l ckc;vbk;8l24zu;s*h 3h 9sw olyjzrmer causes 14 A to flow in the secondary. How many turns are in ;3j wluz 9yh ;kls4h92 o*k;bv8zclsc the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are k6iyxxi:55hc i.t pc3e5+ rp tnecessary in a 110-V primary if the 24-V secondary has3c 56 5h+x.ei y c:p5iipkxtrt 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn cv/-rhgcdkx*grl9r- o:8u ,v v)5pxrprimary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what ig)-o*-9/vgx rprlxv r:d 8cu k5vchr, s the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. a. spd x6m+d+nAssuming 100% efficiency, how many amps at 24 V can flow in the sec6sx.+ndp amd+ ondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil ofh;)a 1v9( t0ji y,xiv 9wvddiq a neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 1h)qtvw,x;d v iydv(i9109ai j 20 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primw*f8z.;q t :rp8f vfvsary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is presenttvr8 sf: .zqf 8;fpwv* in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turn q/;eg/dm9 e5lgh.bg ms on its primary coil and 300 turns on its secondary coil. If 120 V at /.qgel5g h9mb/gd ;me2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turn-nd 9c8oz;r9uwi1y. dv -nnd rs. If the input current at the primary is 100 A, wcnnd iv9oz-uwn y;8r .d- 9r1de can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer haskp;ut3r)t 8u;g t3vps 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can g8p tru;3)v3 ;pkttus expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has sl:zbf+q tw62100 turns and its secondary has 200 turns. If t :+sqw fb6tzl2he power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 Vct+dbe:1iieu74 ds.w . The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turnid4tu.wce1b e:i sd+7s.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually ste/u bkj 3h9xl5yrn4lhdw5 *) cvpped up to 4500 V bcrk9dl wnvl4hbxh 5y35* ju/)y a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. Tucz;aa6r/8* lrxp;rfqv- ja 6he voltage is usually stepped up to 4500 V by a transformeapva*l rqcj;f6za-8x 6 ru/;rr and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistanc6d/dbc ok+i,ana* l ,te of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if thb ok+/6*i,ldta,c ndae transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line -)zcqk i np;b850 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduc)8cq;-b p zknie energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power wouwpyby.2m0 ;3t jrmj;a c+fe1 xy;f.byld be lost if the power were transmitted at 3000 V w+1 jx;ab y fb;f.emt;p.y3jym2r0ycinstead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 29pz( yv5pkmht( v h,dqr.5ww:ql o,a90 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with,.vtaqzlkp: 9wmo 5hq 5 phy(r( dw9v, a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How muchbeyd 5j1 *:kwe5 i/yn(ezapi: energy is stored in the coil's ma:y / eia i*5:z bdkjp(1eyne5wgnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and a b8ghf ufz) pk1pi:40jn 18-H inductor. What is this circuit's time conszj uhkg f1pip4b :)f08tant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rmrfthqvw+ 0j43t*c.5cu b o 1sfs voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlzvn 1rf3gb/ 9-rg v41.u idz+ j;ncedaet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the rer o v2 z-* cref;nxufdl/ qf-:ox+r)2/nyfgc*sistance of the lamq)+u zx rf fylrc*- c f/2-xf2ge:o; von/rnd*p?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power suppzy):c; s iw+mhly. What is the peak current through t+y w)icz msh:;he resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What ik; vh 8vyuww8d (9uat:s the power dissipated i;d wy:kvv(w88a uut9hn the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor i:, vm -vzz-kt,alexr 2s $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistorysdt*r j2v /y2 is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through axu-l n66q a5l34d:x umzu4l dl 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor 62mz+ na lobnb0qh:z sa5.k1aqg, k,c at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil w spkt8i67l2v at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of i0zak rbht wu9 92i2hcd)u*(e gnductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 1574 6)qjdthx-sb W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when378m2fnyuo kp+dpelim(n p:a29 a+ s t 120 V AC at a frequency of 20 kHz is applied7lpfsymo:upt+k2ai 983en( +ad 2pnm to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz sourceqwwgjn 7ife/wzp1wk +0+ a)3r?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of u lt20:7ue mf0gac( vla 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactan ulu9i7-f86x ;udz hwtce at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 12vvyeyv0o; +i m/5uqo 400 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capaciti+ m+w1bew;qc or be 100 W;+iw cq m+1bwe?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz +b9 s -kq(gsygand 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac serieshc19v6s clw7n circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capav ln9c671cshw citive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedanc m1gb ;:gv1 p+.mc5lttq1cfn ie at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series1g5 c+1n1;ltmfc.ptmbgq :v i?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mg5oql9q :owbe-:e kh ,F capacitor are b-5gw o,hk:e9ql:qe o connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series witha6ulc1k 1huz 4 a 20-mH inductor, what is the impedance at 1000 Hz? luh6z1caku41

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-5.yef:d kyz )xro38z hmH inductor, what is the phase angloyyz)k 3rf:dx h ez.85e at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF r/-yu u.btr7wqq qmgp0n.d uc 1:- *mpcapacitor for a total impedance of 1uq -u*rpm1dg yq7. wb:t.npq/mru c0-00 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitaw fc1wk; 2fy 5m)pcg-ences is needed in series with a 100-W resistor and 15-mH coil to g wf ey1pgw cfc-k;2m)5et a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at dqdi8/5) 6r*q wz cb.tx eb+t1 tnt*rd5000 Hz for a total impedance of 4qc 1 xb/d)n*6.tt+wdrtitq*ed brz85 0000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at0k,mptw1- ku4 q sep/j 1.0-MHz for a total impedance of 1p mt wk,p-u/4ek0 q1js50 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in 5 ;pl r *o(z0nfx;pus)fzro3b series with a 20-mF capacitor. What is the impedance anpf0 f(ruo*; zrzs5x3;oblp) t 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor atb1xd1omnl 2;r-uec,+aqh c9 v 1.0 kHz for a tota;hb19qx+r1muocde,c 2vn l a-l impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kH,zimaxzckd0 , n;t76h z for a phase angle of,ac,zzxn 76t h dmk;i0 $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with o g64swptcn/s)o g.a8o2e j58fh ygg3 a 30-W resistor at 1.0 kHz for a total impedang/8s6w5)gtpao3 yfjhg8s c2.oo 4engce of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in*uf g t4q5(5(5hikd h:ahlsdx series with a 100-mF capacitor at 120 Hz. What is the phase ang5d( :qa 45 u(*lhhifsxkht5dgle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and yi6sk 7**) j zywq ae*pi)9ayk1.0-mF capacitor are connected in seriespkqwy*skiy * a*79) )eiazj y6?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and a 09caa yeg5d fh3xt*5n2oqkh, 5.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms cxhf5coe*2 yk9 a,3hqgtn5d a5urrent in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an inductoksa92rg z rk(ky3 2- rooe/ok.r of inductive reac y z2 okogokr.-kas/(3rrek92 tance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W jb( dc:4 s9dzu /3c8jtg7ssvxresistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-s 4g9(sujcdd/3s7v8 j:ztxcbHz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necettsr4(bc. : sgssary in series with a 500-W resistor for a phase angle of.gs(:cbr s4 tt $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. A.nx pqyw;qa76p7s p2bt what frequency shoul.2bpn;q6 wapxp sy77 qd the circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 1f8y;myw fu -s0g4hg.a f7b-xui /o1q e5.0 W inductive reactance, and 10.0 W capacitive r8f ibsx 0gf.h mq 4-eo1 yua-/;ywg7fueactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit is 2((7jfy3ct gy-g4f aivg x5jzpzg7/n$63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance kgozg;8pmw(3z ) p.8s 5sjtjtof 60 W and a resistance of 30 W. What is t ( kp 85t)3pj8szj;g sgzm.towhe power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for 7kn 4v)-ycy eoa series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whevyk-c4 yen)o7n connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequev ktf3vir +y-.ncy of a 1.0-mF capacitor and a 15-mH coil in series?i3 t yrk-+.vfv

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a reson:a wm)gct ;6sbant frequmt b6:gc)w ;saency of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in7dd ocge (kxv;ta21k ) series with a 3.7-mH inductor for a resonant frequot (xvd 1gck;k)e72adency of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series kaq8 ilr zb8(.jq+n 8avr.pfs.; la3u with a 30-W resistor and a 40-mH coil if the3lqaz.v.r(; lkaun 8bji+aqr 8p f8s . resonant frequency of the circuit is to be 1000 Hz?

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