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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 un q5qs6zed)vqs +l :4sjits of 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 that jb yd6gp1.se+-jw( w tthe $emf$ 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 r 5y7i0 25xra-qtlr+iskyes(o( e 8zo on the i ( s+7(r0s i5xra el8ozy-kyqtir5oe2 nduced $emf$, 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 through a loopf nj pk8316kku of wire produces what kind of ch jnkk1 k83p6ufange on the induced $emf$, 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 loop of wire produc0r,t k-jjw5dt es what kind of change on the induced t w-,rt0jdk 5j$emf$, 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 removedq2jsb 4wi-j dsdp8o zj)y)+t. from a 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 dire9 auqhku 0e0 2h9 ;n0xboteoq.ction of an induced current in a conductor will be that which tends t92xtn;e9e k0u 0qoo h a.uhb0qo produce which of the 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 tablw03+m+nsw c jk 3e23 lev9qfzge. A bar magnet is held above its center withv9l wm33sg32qwk ++j z0feenc its north pole pointing down. 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 horizonta9r.e w 1wk2lseyx/m2hl table. A bar magnet is held above its center with its north pole pointing down,2eys .wewrk2hxm/ 1l9 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 vector1or ;+ofdjbr 30mu4p l .:g ahnlnao30 points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense ofnha n43;pm rlgr o o3 j:+bfl.1d0uoa0 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 a region where the magnetic fien*s6axyzo 0g1 .er-v zld vector points straight up. The magnetic field suddenly grows stronger. When zoyzser v*nx.a10-g 6 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 magneticizb1w b0o*epc/p 7uo ) field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current 7e/ibop)*pbo1 uw0 zcin 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 l tgew*+( o m;kpo /z(srrfs4v5ies on a horizontal table and carries an ever-increasing current northward. Tw/z+( ;okog *m4w ptr(evr5sfso coils of wire lie flat on the 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 et4 3z mwp.jhx:v m.8yqntering first. As the north pole enters the wire, the induced current will be (as viem483qtw:j y hxmp.vz.wed from above)

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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 constann6e514ox;zs o, mro6kgw 5-.hcfzygi t angular speed about an axis whose direction 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 ir5-gz;nc41yow5ifx ,6e .kog6m h szof 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 wivy he5p(vat31re is rotated at constant angular speed about an axis whose directvy31 t(phea5v ion 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.m26ker rwcdl3 2 *m:et
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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 totk+a1ta 04xl aifqud91 -y)that 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 a magnetic field.zx08a b *:s6dbktt0 od 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-west im. ;.n3l4lzxt qkq si:v0/hvdirection) is moved northward at constant velocity through a magnetic field that points straig zvk4.l/3shn0i ;q.xitv :qlmht 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 f iehug:6:l5gangular 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 transfor6sb.znkxprq3*b8 q d*ms

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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 revolutio fuq5e:9 ,d.eosmie:kns each second. The frequency of t ukdo5s9q:e, ee.mif :he $emf$ 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 use cw. 2x1ejcndt)qij4* d to

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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 tsrt (8xwffo-6 hat

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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 knskm g mws6. t+d.0 k5qbq)1bthe secondary coil contains more loops than the primary coil then it iq+s t50.kg)nmbw b.m sk16 dkqs 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 coil co2:ro7d.7ppj 7 vqtv ientains more loops than the secondary coil then iteid 7v7rv:jpqp 27.to is 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 power ik 8 bvsaaohua8y,17 *unput

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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 circ2yqs6rzs: o(fuit,

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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 inductor are connected in series lrf0 qax69 d8wkz3po mzp5*l: to an ideal battery of constant terminal voltage. At the moment contact is made wi6f:xpma38 l90 qodplr5 *k zwzth the battery, 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 z-s qen*)hiw9u8t9awseries to an ideal battery of constan-wtuaq hz ie9sn *98)wt terminal voltage. At the moment contact is made with 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 apab(0.u7nwj(p 6 q axpnd 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 resigd1+s0 sx fx7*epce p-stance 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 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 indus38kh*ed5wyp sc) 4 ixctor are connected in series to a battery. The time constant for the circuit 8wd5 yc s3e)pk4*hisxrepresents the time 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 inductqhrkoftdhro*i +xl8 + o u v8(4eq6y51or are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current tqrk6l8 oxv1o r+( itue8hh4d5qf+ *oyo decrease to

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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 the same unitslqsllt ++ rfb:2(naa( 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 this circuit, the cu g19ai afz5;)1z sctb;x9r dnfrrent

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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 .vsll0 ub8m t*AC power supply. In this circuit, the currentu*b v.lt8 m0ls

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactanpueec;4* 2zj :vx7mzp ce in an ac circuit changes by what factor when the frequency isjpz2pe7veuzc* x ;:4m 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 AC voltage across an inductor i)d ks ncli+29)q fbgf,s doubled, the inductive reactance of )d9gqsc,+fkil2 nb f)that inductor

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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 erpmcpk4 c0duw;n.+ 7 across an inductor approaches zero, the inductive reactance of pr7 n . cpe+;dumw0c4kthat 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 g6fqpl95wyc if 4)wk4AC power supply. In this circuit, the curreq 4 9w)gycfw4 kilf65pnt

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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 anq0c4 mw s15tbx ac circuit changes by what factor when the frequency q0m15xb c s4wtis tripled?

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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 voltage acrossiea e q5hc/lz)/r*lcclnc) fb,;-0m j a capacitor approaches zero, the capacitive reactance 5fi,*/ezc l))-q rc cl lbenmh; 0acj/of that capacitor

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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 between the voltages ofe/m q6/urgyk . the inductor and capacitor in a RLCu.gkrm /6yeq / series 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 RLngyze3og crh7b;*/q vkmk x 684w)0wwC circuit is defined 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 of the circ u -marbu1/.ird5 jqm.uit increases if R increases. r1uiab./.m5dj-q r mu When is this statement 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 impedance of the circuit incrtu ,taip12 wf/eases 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. The impedance of the ci9uwm4 grpu /, vyj4h(krcuit 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 andhg1mxn/0 8t) dy (tbci the capacitance both double in an LRC series circuit, the resonacndgth (txb8/m 10i)y nt 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 circui2/9 3fobi3 sstpnmm-quq4vg3po )v l;t that is driven by an 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 RLC zf4wm9 q+ l* wf*ok1oycircuit 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 rafn row- cj6 h pn+yqp16+n3.svdius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane 6+3wn.1fcjnp6+sypv qnr-h o of the loop and 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 meaq fq8zp, sat5*(xr 0 is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the lo8xt(*zq5erpfa qa 0s ,op 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 m0ro/qi8s/02ofo v tspagnetic field of 0.20 T. Find the magnetic flux th/0p/or 2v0 tos8ofsqi rough the loop when the plane of the loop and the magnetic 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 adjustable single loop is reg,mn55o:: xks m0pzjaduced 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 froz;f8 ,euaw; vjm $4.0 \times 10^{-5} \; Wb$ 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 w85 q.3wux:xsve 65aq8k ynauha; 0za with sides 18 cm. A uniform magnetic field is applied perpendicular to aw.0:6 aqhwu8ze 5 ys3ukqvn5xax ;8a 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 induced $emf$.

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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 uv:nryi4 u6vb4xh( n5) 7ptrw5chq m2with 15 turns and an area 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 ag+wenoqpu,f;7mp)08)h jr yx nd 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 w4day -i2tsmgw4y, ds5ing span of 60 m flies horizontally at a location where the downward component of the Earth's magnetic field y5w2sd yd, i4m -gta4sis $6.0 \times 10^{-5} \; T$. 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 yfz d o1 w-adx4g7wsh7;(:tidv8ht8xm long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic t14z-f d hyaot8( vd7gd8: iw;sxxwh7field 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 generator has 500cfl2ubr;:a3 hb +9kafij3jg2 nbz.t 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 ) mlx8u 2vz1xvwire 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 rectangular loops on its armatu;qial 5 fxyco++7e06 zj kbas3re. 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 uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation y+s ; 5c0z6xla ij7fqba+ko3e, 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 turna (bq4gm nli +c:(ujt4s of wire 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 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 gem1 x)yjy1zhyosg l7 aw-967 w-qax4umnerator with an output of 12 V maximum whew6usyy4 a ah -xgjw )-1z17l7yx9momq n 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 generator with a maximux3 6uxrndw4zx:nlx ; h+7(prf m $emf$ 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 mote fxjqi9c 8pik.* znp7- x5cm0or operates 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 resistance of 6.00 6td cjbde/y5 0y)+8 g7b:e v f6qefkiiW. The motor operates on 120 V AC, and when running at full yi)jy6fd:6egfde q + c b 5etv8k0b7/ispeed it generates a back $emf$ 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 s0,he; fw*iw vl,6: ( ozlp vuq(2xfisW is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up current, eifp :0o* sli(sf6qwuhvw(2,lz; vx?

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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 internal resistance 6.0 W is connected to a 24-V power supply. ho0s6s;3op* ptsrfk : The operating current is 1.0 A at full speed. 3ko s;osp0s h :tfr6p* 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 resistanv+0z)3d-mt o(t xx6kskzv w;rce 6.0 W is connected to a 24-V power supply. The operatin)kv6m3d ot0 w sx+- zkrv(;txzg current is 1.0 A at full speed. What is the back $emf$ 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 needed to regfd a(cnw,8zh.a5ch,duce 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;i-ct h)* 0zdiwe+ 38gyz0 y7edouan v primary of a transformer causes 14 A to flow in the secondary. How manh;y8*70)au3o-i0dze niw+g yv dzecty turns are in 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 necessy4;yw0 .e kirfary in a 110-V primary if the 24-V secondary has 100 turnse.y; 40irf ywk?

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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 primary coil an 1c -3jhm;5*j1wjid;l usilk gd a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the prim il1s jl3;jm5ik-c;jh dw1 ug*ary?

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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. Assuming 100% effis hg +n4,uvaqy3,vr) eciency, how many amps at 24 V ca,ysrv+),h aqvu 3 n4gen flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign 1m.j:mc 34argt e3ed1 xa*o 3xoysm0 ptransformer provides 7500 V at 10.0 mA. The primary coil0gam 3y3e:x*o 14jeox s . tmrdmcp3a1 operates on 120 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 primary coil and :mnf 5fone /.v300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what volt :n.omfv 5enf/age is present 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 turns on its primarmo gurua id9753vnk83mbz-blpq6 :yu5 -r4cl y coil and 300 turns on its secondary coil. If 120 V ap m9nl378 zv bd 5q3urm5-:kl u4bgryc-oaui6t 2.0 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 it.x zb,yo pv/a 1a/y t0adzb oj(9k6;qls secondary has 200 turns. If the input current at the primary is 1ya t/1dbz.p /qx0b9;oyz,o( ak6j avl 00 A, we 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 has 100 turns and its seconkwoq1t7 o63 4*cbl uimdary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secko3iwl6bom4 *1q7tuc ondary 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 100 turns and its secondarnc+ t/y:;nihcy has 200 turns. If the power input yhc/ic;nt+n: 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 19o ee.fxb9 mc+20 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power lem.+ f9xcbe9 oine of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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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 currw( xr k(*.j(5ybvp+cs snc*ycent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted th *c(w5 c ry((.kb+* jxvsnspycrough 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. Tcxa8l. 2m orubzc bfw pb1(3u9y6-7xzhe 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 percentage power lost in the transmission line uc prfw38-6xz(b 7 2lzmb.oua yx1c9bif 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 msrgmp*;.k8 z* atuw2 line 50 km long has a total resistance 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 rzg;tpm mkuar 2.*w 8*satio of 100:1. What percentage of the original energy would be lost if the 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 50 km long has a total resistance of 0.60 W. A generol xh10ajyz+- 0i:je oator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped upolj01ij0 xzyho- e:a+ 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 lem n00ki 3lkavm06;g;k(inm diss power would be lost if the pow;ikn i0 6 3im0m(;kgkda0 vmlner were transmitted at 3000 V instead 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 20 A. (7j,o1xef1 nz7*ybl e/oe ct zIt is to be transmitted on a line with resistance of 0.60 eoetz* 7 oxe1 zl7cn/ yf,b(j1W. To what voltage must the generator output be stepped up with 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 carriesimb r0ka:bosx)s6q +, a current of 5.0 A. How much energy is stored in the coil's ma0m o,bq+brk)s xa:i6sgnetic 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 an 18-H ind0c:n-uqz sk-ductor. What is this circuit's t0 -z qdu-k:sncime constant?

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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 rms voltage is 12o5edl )rrwg 0wn*qs0m(-n 4 nq0 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 inn 4i-e-/ p lu101 xp7tiwfzgyk5guk y,to a 120-V AC outlet. 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 outn(5iuo*dom j7- dlb2olet. What is the resistance of the lamp?-2o*oo d7( jdlub5mn i

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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 ackwwdl+, 9h zu5zhu2n*6g b:pa power supply. What is the peak current throa p*d26l5: b+n9uzk hwghzu,wugh the 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 is the polr77 q,6j y)o3rjrp) vlka8exwer dissipated in the63)l7pr xv ayj)7lo8rj k,rqe 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 50-3a8wsv. a4mdhd f0.3z/x nvuh W resistor is $I = 0.80 \sin (240 t)$. 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 resdmb+ (ie 3d:pg(cm0tfistor 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 4swjg l4 j2zkp0n4t-v a 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 at 60 tp bw,:u0p e*cHz?

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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 at 1000 1zyv: i(tamv-s yu)0u 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-m4hqa ak v9 nllt59:sh;.f2veuH coil have 14.0 W of inductive 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 ncm2/2 remvkh7ecessary for 157 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 when 120 3b szq4e9 n-jvV AC at a frequency of 20 kHz is applied tn - s3qezvb49jo 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 ss*auv exwv 7)w (7:dwaource?

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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 a 4kpkbq5+z s g+xup d+1/ h9l3rv5n+mrh.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 reactance at 10 kgwxai .a8m:6jzdx m42 Hz?

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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 ok0r5g.th jak3 f 1200 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 capacitivew: nda-h:d3xu reactance of a 0.010-mF capacitor be 100 W dnx3ha-u:w:d ?

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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 throw yvt:rk(1: vough a 0.0010-mF capacitor at 1000 Hz and 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 series circuit with 12.0 W re9 tl212pp9 q6t1 rq oayysum(d(g+ aafsistance, 15.0 W inductiy(9g1durta2lq2tp+(p1oa m 9y f 6q asve reactance, and 10.0 W capacitive 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 im1qb3xk w, lb7opedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connecte xlkob73 ,bqw1d in series?

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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 150g2*e ajxi/8sub:0 ln 7oam) gs0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor areblu7:se n8m/aix0ao s*jgg2 ) 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 5ufar-z; 1tlv with a 20-mH inductor, what is the impedance at 1000 Hz a1vl;f-5 trzu?

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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 0sflplg6vo8 t4y9bv/ 20-mH inductor, what is the phas 6 9bvtfll0p4o sgy/8ve angle 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 wity:h) 6b g8mlteh a 20-mH coil and 1.0-mF capacitor for a total impedance of 1ym6l8bheg :)t 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 capacitanc.uxe;agq m4mc1 :v+ kxes is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W1 kxv:g + 4emmc;.qaux 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 x z1qs)toru73lk.os* at 5000 Hz for a total impedance of uso.xrq 7l3z 1*ots)k40000 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 i w0jq9hu3 gbi(n series with a 100-kW resistor at 1.0-MHz for a total imp9b j(qiwg0uh3edance of 150 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 series with a 20-mF capacito;k+ ;8 l gpbgg:ephe 9mvd9t)cr. What is the impedance:gb+p8t; v p)cmk9l9ege hd ;g at 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 capac mrm)k+ ny; s4b(k/rzkitor at 1.0 kHz for a total impedan r (bzm)sy;n/+km rkk4ce 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 k;+ rq3m7eusz ;mep3:ej gwuj( Hz for a phase em:qug3;j73 je;+rzwu msp(e angle of $40^{\circ}$?

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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 w oa:hptgj*k. uei x6,;ith a 30-W resistor at 1.0 kHz for a total impedu*;axek .p:, hjgio6t ance 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 series with a 100-mF capacitor at 120 Hz. What io 3) hutk.tm0is the phase a. ot0m)htik3 ungle?

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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 V8p sld me7e5e6w*ih8f and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF c8m pfhs8ed*ee 7wil65apacitor are connected in series?

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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 resistorf*6l)-t(hla v4baz js, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rma ) af(t-4*6bl zvjlhss current 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 capacitlg2uj 1,q i,sdor of capacitive reactance 30 W, and an inductor of induct,jq1s2,l gd uiive reactance 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 sebs :iuh: g9rw*ries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a rug 9iw:h*: sb60-Hz 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 nece9 t6qiev3,u **i c afoo6+gsfassary in series with a 500-W resistor for a phase angle of o*,3 at9qaei u of* sci6+6gfv$40^{\circ}$ 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 h 4v-0ufdecnd-as R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order- dvec4uf-nd0 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, 15.0ek w29l-gn)*uf bhq +c W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 1ug -c+l9*)k hwn2qfbe 20-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 circuc ndat .xfrc2o9yf*w*i,:hlx; k )uw; it is $63^{\circ}$. 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 impedanceou1(s2oaqn54 )buw z q of 60 W and a resistance of 30 W. What is the power fa 5(2n1 uobswqz4)qau octor?

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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 a setv 0mykw 9ggi liv i5,ga3uf-/1cku,:ries RLC circuit containing a 50-W resistor, a 10-mF capacitor-1iyk0g 5ifkl,u w9ug m c:g3t,i a/vv, and a 0.45-H inductor, when 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 frequency of a 1.0-mF capacitor and a 15-mH coil in serisbqunq i;bv v:)ho 4mj:53,wees?h e5 :jb3u4i:w vmvbsn, ;qqo)

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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,;rwyn95 ekrilxv7 8w .7-mF capacitor for a resonant frequency o8r5el r n;7xywi,wk9 vf 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 in series with a 3.7-mH ia 0616jlnb 7 +g8i2mafeiyrlanductor for a resonant frequency of +a1al7 6g nfjami6ibrl20ey8 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 wmhxzfzqs.: (ni 3t1q)7un,dseries with a 30-W resistor and a 40-mH coil if the resonant frehmqs,wtzf)7:( uq zni3xdn1. quency of the circuit is to be 1000 Hz?

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