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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  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 areww)vdeo4.v o: units 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 thjp2ge (o44ycmrwxehjx *6p +5e $emf$ 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 changwetqk6o * 3ea7e on the inducek3e6 7at *oewqd $emf$, 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 ma7g9cig xqad9a7sy)x96emzd y7- t hl6gnetic field through a loop of wire produces what kind of change on the in6mh 9xl9si yzxdeg-69ay )7t 7 qg7adcduced $emf$, 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 pw qzr,sv,t9wi63qo2 a loop of wire produces what kind of change on the induqzqs2vtp93,ir6 ow,w ced $emf$, 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 magnetsd)7i ;40nzs h kcjinp0gv- ,sic 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 sk*kzy ,i 9i/jconductor will be that which tends to produce which of*sy9i, i/kk jz 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 table. -w 8* ,xtoefjqeo88njA bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed fr,*efxq w8to8o8j jn-e om 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 horizontalp;kiw) tw t w*q) ox0hq0e3)bb table. A bar magnet is held above its center with its north pole pointing dow0e3*qihwtqotwk ) b );wb0)xpn, 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 1ku6 eu)6g w8xlonwlfq /s1o9magnetic field vector points straight up. The magnetic field vanishes suddenly. os6 9lo 1)flge1 nux/qk86uww When viewed 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 a region where the magnetic bhw(-(am 6wft field vector points straight up. The magnetic field suddenly growwfb6-hm ((wa ts 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 whez*ngo4k/c25oh i o :rpt e+8rzre the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, whati z:ep4 r /kocgn* z2o8+trho5 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 horizo d9uqew,o h,1qntal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewu qd1ew9 h,,oqed 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. i 6ye9hyl,nz,As the north pole enters the wire, the induced current will be (as viewed from abovez,n6 eilh9yy, )

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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 a9f f fa08n(ak(0gc3uq o +xsfnm; py9ot constant angular speed about an axis whose dir039 u9m nf(f+8n k;py(gxo a0aqffoc section 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 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 wirepn (*llqpv q-7 ant+uzu/-dqrn+e- /j is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be /(j pqn-udnl atpnr +-/ e7vqul+z-*q 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.og2 jd.r8kyn*edrr - /
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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 qgr 2*y 5p6s x*:wchcr;orri9that 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 mai6,xdn +hmu /egnetic 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-west direction) is mo/7 oucm2v, krnved northward at constant velocity through a magnetic field 2uo,7 /rvmcknthat 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 angular veloa zwsr,fw qs40yfm;(5/gav7 bcity $\omega$ 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 trj 0.p-p7sbvbcansforms

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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 5yj3.5kz ntgsex d73r frequency of the 3s5gen5yk .rdxzj7t3$emf$ 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 d2uy10 e zpo3o zv69mtdevice used 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 that,lji u .+xzr.t

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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 coil contairx :l:gifwsn)+pdac+*ukhv 7x7sl6 - ns more loops than the primary coil thi 7+wfx7 s:u- vd:nhga)prkcx*lls 6+en 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 t eo3gaxk.x-33p (z bmjonwyr 4u;5v)khe primary coil contains more loops than the secondary coil thk53wxn gu)jmp;v y.(r3b4koxa- zo3 een it 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 inpycq s8 2 d qvp70xn1qr;ewp)n;ut

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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 circuit,ot:2r. i1,heredz; xx

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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 6n 32* c lv4c; it(vlj-os9eoa1cwwgeare connected in series to an ideal battery of constant terminal voltage.3t cc oi 6;osj2ve 4 e-g(wvnacl91lw* At the moment contact is made with 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 series to an ideal battery of constkod0bo-z u oj4(1 yu 4xrv:ai:uu/ mj.ant terminal voltage. At the mom4ju(o oxuyuoz-0 uik.b::1mv /d4 j raent 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 inducta+k(*t v zb:vksqx +nc6nce L and 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 is connected tp h-e+fw2a,m nx7qvp4o 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 battery. fqjq ig * zgevqay2peyb7-;: nf:,q;1 The time constant for the circuit represents the time requirevy bp :ejqqq fgg,z1i q;a*e-yf:;n72d 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 to a battery. y;ypujovr1fkb0x+/w9) fy u3 The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current tw y k1fj0;ufo+xbu) 9y3 /pvryo 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 t m 2s;690iujxc opij8ohe 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 this circuihs upug 877svd.0g +yonhfi3 6t, 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 AC power suy u m)5zx*x)xdpply. In this circuit, the curren*zxdm u xx5))yt

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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 a4o 2l/1myeojvoxx 3.savw5 hwlt ,/a2c circuit changes by what factor when the frequencyaa / m15.oxl wtexy o4,ov2vl s32jh/w is 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 is doubled, the inductivo) euqe9oz/h;e reactance)quz o;/o 9ehe of 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 across an inductonjgl 2/m 0xhw3r approaches zero, the inductive re /mhjx32wn 0lgactance 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 supply. In this circuit, the cuz rqth c;ukou. v: p8mw;i5,uld(m5e0rren;pu.hk0 vd55w (il;m ,mqe cu:oz8r utt

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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 factor when thiy,h bu+c:)9jmz :nn be frequencyybc, i+zb: :u)m9nh jn is 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 across a capacitor approadr grw(.4n4y ccf0dz2 /xzcg:a3t4es ches zero, the capaciti(zr 4 4ftwx/y0rsg4cca3:.dg zec 2 ndve reactance 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 of the indg egyr,77-s ic zhbk56uctor and capacitor in a RLC sibke,g yrz h5cgs-67 7eries 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 * v(tyni/)t h+ 9iu*)vtwzbj fis 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 circuit incr7bx d: es64txpeases if R increases. When is this statement truep6t :sb4ex 7dx?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuitlc)b(+owb c1 z. The impedance 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. The impedance of the circuit inb+xc i0h27xsy creases 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 z/ kup bet 94*fh0hj szf )5xjfe/q44mboth double in an LRC series circuit, the resonant frequency of that circuit/ek jbqs /fu49z 4h efhmt)z0 xfp*4j5 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 circu 5n)xnjzbh gy)ne28f/it 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 ciz,a+ 9k0) rl6u:rb4ruihawp hrcuit 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 ry-2w+ w pg x4ljgm(ik;otating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the p(+x gwil ;2kmj4gp-w ylane 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 m is rotating in a uniform magnehbc a v -2zznu3vm(ja1 n5h6pl-l,*vctic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the m n hnzl,-u 2v (ac615av3pljbmhzc-v* agnetic 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 g8o*l 3p8co+r )7lj cxjef;y+isiu;a magnetic field of 0.20 T. Find the malgs p;e;i7yjrfxl+o*3+ 8i co8) uacjgnetic flux through 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 areal)uueq(g4w o+9m wf r) of an adjustable 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 chyu7nbs;t lf aajyo6-t)/t, d ;;l vm,kanges from $4.0 \times 10^{-5} \; Wb$ 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 squer20 fpn 2/r q(xkzu5t8w9fpi are frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the pla 2e082 rq5pi9 nrxpkf zftw/(une 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 with 15 tum5eq sv;anv7 (rns 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 and area dqa3jpiw 0.fu;a12 gb$0.20 \; m^{2}$ 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 m0 :lz1fb 7n ;+t7:ebsc ujyfispan of 60 m flies horizontally at a location where the downward component of the Earth's mag+:7:jub ;7 zbsceyt1nilmf0fnetic 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 angularzlql) ;ajmabal*a(- ) velocity of 2.0za; a*(m) j)-qlbaall rad/s about 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 generator has 50 loops and a cross-secti :s 1zyesmab:sa:i9h +onal 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 i oy0 .;ctfgic)* dy7j yojmx3wo ),j .zu5b8c100 turns 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 $emf$.

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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 armaibn7jf k-zu c,+8t+rature. 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, what will be the maximum output voltage of this genera 7afk-bu+zjc+, tri 8ntor?

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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 wire49 (arutnp6s5 eol1mr 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 wisoq hv maq )tqxn(+ou.5b1// kkh to construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.0.1+/qam/(obkoq tkqn vxu)5 h50 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 genera5ezzhm97;z-*-7yx ofo8hysjte*. ohp-g cb ztor 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 operry pzzz,e3 atz2arr+j/ cu001 ates 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 W. Tht/ h6rkj t hrlle).4.2ffv n(a rxdndk+.i(:re motor operates on 120 V AC, and wher h2(fa4.d:f knvlj. + h6k.trn ledx tr()i/rn running at full speed 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( z+rd,un 1lzy+hz4kb 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is th1 zrk+zb 4hd(z,lnyu+e 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 internal resistance u(e n)mt/itp:6.0 W is connected to a 24-V power supply. The operating /ip et)tmu:(n current is 1.0 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 internal2b*lu cq(7sz 3cab5ukj;wa4 b resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speedbqc w5j(l*u;kba b a7s24zu3c. 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 tlos8 9 ;-2vt zhvgmzp5o 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 trans(:xt 5wz(0f*yn ss zaeformer causes 14 A to flow in the secondary. How man s*0t5wsnaxyz(ef(z :y 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 necessary ijx/a 9zwple:(qdb x) 7n a 110-V primary if the 24-V secondary has 1w)jxp azx: (q/eb9 ld700 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consiqh0 7 i,qes:kxup:)lf sts of a 500-turn primary coil and a 2000-turn secondary coilqskh: qli)f: x e07up,. If the current in the secondary is 3.0 A, what is 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. Assuming 106qmx d 9 gvjjpf940w4g0% efficiency, how many amps at 24 V can flow in the seco9 d6fwj 0p9m4vgqj4gxndary?

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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 transformerf b,gw nnu(p:(h --apr provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does nga wr(-,b-f nphu:(pthe 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 300 turns on itsm2b;p cfck4a ; secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the seco; b2kpf mc;ac4ndary?

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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 primary coil-/ 38mx3umg4tx azrq9vdu ty5 and 300 turns on its secondary coil. If 120 V at 2.0 A is appliedgau8z 5/ 3vmt-u x4q3d xrt9ym 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 seconda.syt i0dpg- h 7w 1;wxrimju o7ok3/2nry has 200 turns. If the input current at the p7w7 p2/k0ytg -d.u 1rmwshoo ;xji3inrimary is 100 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 bf3ze yrt5 n:jrwsgr0s 9 8*sld4ne,1 secondary has 200 turns. If the sds lzs3bt0r9r: 8n fyw51,e j4rgn*e input voltage to the primary is 100 V, we can 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 i3v z. kmu5w:phas 100 turns and its secondary has 200 turns. If the power .uk5 imwzv 3:pinput 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 V. The vol0 z2,iy*u;s8cord jqptage is usually stepped up to 4500 V by a transformer and transmitt,2 zqi r8sdy0p ;ojuc*ed through a power line 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 current at 120 Vwsikqv*g1ddefh *gp8 0k(6e0w / zhn *. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of toge*(h0*0vg1k 6n/df z kh i8qsdw*we ptal 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. cgn0f85 8iqrjThe 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 line5r8ij08gqn cf 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 t1 za2 ;ih ; kwiuzxpx5ls4n-o0otal 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 ratio of 100:1. What percentage of the original energy would be lz; z;1x2 5o ps4n0i u-hliawkxost 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 5hot9 nr.*qjk/izm.w 6 0 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 ratio of 100:1. What percentage of the original energy is lost when the transformet nmqo 6kjw .9h/*rzi.r 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. Ho/2pyv3e jgd.z r6wuy3w much less power would be lost if the poe 3dw6 .r23y vu/gjyzpwer 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. It is to be transmitted on a line asvg 5 /l tkwnm0wq4k g)y(b8m4qc2l:with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power k04ly w5n)gqmastb4 (8 /vc2wk :mqgl 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 much energy is 4+*lozrl3eudu; 3wyf8xti) i stored in the coil'uufiw3l8+d 4 ri)lz3 *eyx;tos magnetic 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 .xgnt)(7wh;ds5tt zucontains a 6.0-W resistor and an 18-H inductor. What is this circuit'sdzuh.s tw(gt7x )5t ;n time 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 12065pihz/-lfcmpj za u dyd n(6kdd,571 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 outlet. What is the peak currents,t ccl9bfgqw0y y0co(mf 386?

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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 ibo+pathm +h0 9. .mepknto a 120-V AC outlet. What is the resistance of the lamphm90.p b +pk aoe.+mth?

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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 cxa+ma5nj3n9 ac power supply. What is the peak current through the r+na5m93xcjn a esistor?

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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 pyp.yub5e ym; u,k9i2 bower dissiupi yby9mue 2k,5b ;.ypated in 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 n4.m oj:kf.g2me(8cblz7f/ztzx0s 2uh 4bcu 50-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-Wxl*j(njf78+l*k: m 9i1to gglx eski. resistor 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 a 50-W resistor olf25 vd+ 3vnyis $I = 0.80 \sin (240 t)$. 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 aj pejmue m 3/c:7)o-zc 1.0-mH inductor 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 coyerm0;( rmsu:gb8u ,aetf 0b -il 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 inductive reactancrjs ;-ks+mi;wq. g gm+e?

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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 157 W of inductive reactance at 1000 Hl5a -zuhyoo95z?

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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 V AC at a frequency of :jzsk 3l*0.kj gkhnrpa t+v;120 kHz is applied tog h*p.krktj +; :svknlj 3a10z 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-c0 kf7 44hyv.f5**7.q czdftswxrnjb V, 60.0 Hz source?

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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 4.7 ;fux:qznu6 x0-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 r9hnd8 ky2md3lp:) vbh dr(;wreactance 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 m1c9zpbpn92w8 yj qm-10-mF capacitor have a reactance of 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 capacitive reactance of a 0.010-mF capac5og+ o cj) *0aju;iauuitor be 100 W?*o) aj+u5gu ji aco0u;

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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 1m78sob t5luebu82 rnthrough 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 impedanceo*v -kevot(3ee r b*n* of an ac series circuit with 12.0 W resistance, 15.0 W indu*v ee* ( okotnvb-3*erctive 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 impedance at 1500 Hz if a 100-W resistor,, lie4uobon,3 20-mH coil, and 1.0-mF capacitor are 3,o4n ulbio,e connected 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 1u ruo2wezfe539 ys 89mla 6kdn1ywv3,500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitowa96s8 lwfrduk , 3m2vz1n9 3 oyuee5yr are 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 connecq r mfxbaz0uicd58(cg,r ;um,1 7mmr*ted in series with a 20-mH inductor, what is the impedance at 1000 Hz? 07 ,85urzxr f*dcimbqu cr1(mamgm,;

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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-mHo 9g7ir)7x2 qm g; 2wof+vrbxt inductor, what is the phase ang t 7v+ )mo22oiwbgxf g7xrr9;qle 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 qfen /34 ucucl--d 7brcircuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 H3cu-qeb/4r7u n c fdl-z?

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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 capacitances is needed ijtn v( r++s4zhn series with a 100-W resistor and 15-mH coil to get a total impedance of 11hvt +4jn+rs z(0 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 t):*ygrgxf;v series with a 450-mH inductor at 5000 Hz for a total impedancet:gy r vg;xf)* of 40000 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 inhl5 q +nw.0j6ffwmc/dn hv:l 4 series with a 100-kW resistor at 1.0-MHz for a total impnfdw4:.l c0w6 fv+j5n hmh /lqedance 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 y m 9 k4vxgf,+mhw*lk0ppptt6g fqu:a1n,0-u capacitor. What is the impedance h 91*fu: ml mtkgpgpny 6 tax0,v 0,kqfup+-w4at 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 w yo4pl:uq+f *yv( g sl)fd.(kkith a 10-mF capacitor at 1.0 kHz for a total impedance of 45 W?k.fy):gu4l ofv( d*s+l k( ypq

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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 kHz (6)q 0f.l b4re fyakoj2uza)or/73 .o viwau rfor a phase anob . u)j4r2./yvei6krua (oa zq3 loaff7 rw)0gle 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 ndv 0gk(c4b, nqeeded in series with a 30-W resistor at 1.0 kHz for a total impedance o0,gc4kb( d vnqf 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 serg8.h n4y nm u2zir.2afies with a 100-mF capacitor at 120 Hz. What is the phase anz4nrg2ymu n .ih2a.f8gle?

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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 0z4r y.j+iwgzw) px d98,j bce1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conn ez.rw 48jz,db9wpy cxig )0+jected 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 res/w5hr3 /qbmrzistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 125/ hrmq3bwz/r0-V, 60-Hz power supply. What is the rms 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 capacitor o1r*m p9 ju/o1pufzt .rf capacitive reactance 30 W, and an inductor of inductive reactance 30 W ar z t1u pp1/*rourm.9jfe 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 seriezym.k--z7u v3b;hovfu)m w-as RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whe u )uk--v o-7ba 3mwvhymf.zz;n connected to a 60-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 necessary in series with a 500-W resisc dvsu+5sl *w6tor for a phase angle of *w6v5c u+s sld$40^{\circ}$ 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. At w+3vq7u ojm:; 3f lamsfb9)bdj fysx03 hat frequency should the circuit be driven in order f 7sox f)vq39+bmda3 ;m0s jybu :flj3to 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 circi/fm.xt8 3z cbuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power st8cxiz.fm/b 3upply?

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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 Aggcg,om z9z:o5+p5p hC circuit 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 impedance of 60 W and a resistq.0wy ja5w 60tedk il1 9*gztaance of 30 W. What is the power factorg. yw0106kjazqe* lw ita95td?

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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 series RLC circuit containing a 50-W resistl8shl - ;ye,w6tcx-a tor, a 10-mF capacitor, and a 0.45-H inductor, when connectwlttcx ae;--sy8, hl 6ed 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 cap gai.v jwnue*/bx5g*8t. +gr tacitor and a 15-mH coil in series? .+ittr*j .5bungewa*xg8gv/

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needekq 1s 7bln/l y2o:e9dzd in series with a 4.7-mF capacitor for a resonant frequenc ky b7lle:1odznqs29/y 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 in series with9zqm;c(5ssdjr4s( ,y u6 hmed a 3.7-mH inductor for a resonant frequency of d6(ssjzm yqhu5c;,rm sd9 (4e 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 with ymhy0kpgzv z299v slj-ck/0c:0zq/va 30-W resistor and a 40-mH coil if tvqyvk0/-z 9kz 0 cp:v90z/ylgmjs2ch he resonant frequency of the circuit is to be 1000 Hz?

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