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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 are units of mak5(zd*y dbda. gnetic 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 ty,;d li b,l frpq7kh73he $emf$ 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 cz11os) za8al /gs; x moq2f-paoil produces what kind of change on the indu2a apgf1 8zq ms/ ;oao)s-lzx1ced $emf$, 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 tham0 /ds,a 9sple magnetic field through a loop of wire produces what kind of9, dspasa0m/l change 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 p-dd aio uj xm8j,+/ a*z+9uqfsroduces what kind of change on the indu9i* uafa -,+zs jjqoddu /8+mxced $emf$, 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 magnetic :d66 iwlohl9ibue ,u8field 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 dire, 0rn6ffnxjuv nx0i/3ction of an induced current in a conductor will be that which tendiff x,n nu06nj3xr/v0 s to 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 table. ;lzz :cahyt, .(qtq8o A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewedcoz tzqhty:q.8,;la( 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 ta.s/ulozh5tp pvk6 : .tble. A bar magnet is held above its center with its north pole pointing down, and released. As it ahk . p zs/.pvot6u5l:tpproaches 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 m8o4nz)gc- it uyb4 /cpvzb6 r+agnetic field vector points straight up. The magnetic field vanishes suddenly. nb-vp oicy/)trb48+6u4 zgzc 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 k*x xr*ae+5w- xoqu+stable top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of +-xrs q*o5xex *+ kuwathe 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 h5*3oieagc 3am mlv-i*orizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from a*eci3avm35 -*im lo agbove, 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 carri tg(:fu.5k*bsy k9t wsrcsi y6 y:*v)ees an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, thstc )96sek t*y(yv *5ubf krg::iswy.e 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 enter7ltdlu) g/erym 7pw x7f9i2a(ing first. As the nola 7/7eltip d7x(gr 2w)m yuf9rth pole enters the wire, the induced current will be (as viewed 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 constant angular speed abouf9h*)rs hx 96loaxlg5 t an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of fxo59*6h)h9la sgx lr 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 constant angular speed about an axis whosc,fwyqe /7s8fh x21h8c e vu3qe direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the e,8q2f8 f7h h/y3swveq u cxc1loop'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.wc+a8wdp: adt m,d*q .
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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 that hldu4i y*r n4hujw3 3i8zmwc 71q:4ky r1l7a san $emf$ 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 magne aann-6 (+ee1nmb(.fku 0tkkatic 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 m2hlv(wffji 79 r c7az2oved northward at constant velocity through a magnetic field that points straight down. Make a statemen vr9f7(2jhf2liwz 7a ct 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 vemh sm 3kr9n7 ,es)t1qxlocity $\omega$ 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 transforqig;r; 5h pu:ums

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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 6 odjdqa4 5hrqrvwa3 )43ek1-r0 revolutions each second. The frequency of ta1derv5q4hw o)4-qd3j r3 arkhe $emf$ 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 tzulnuls( y9/ qckp7w +o31to/ o

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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 0l*zitao 8xw 2that

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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 contains more lo4 8kuohdtdxq g*/tm*tt8io+ 3. 9kiknops than the primary coil then it is /d xig . kkh+tnotqi9u *t3*om4kd88ta

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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 contains more l 8z;dwtdm3e9y7y th-roops than the secondary coiym9 tw8hzy-d ed3;r t7l then 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 powezumqcb (15d:x :uq x-zr 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 resonanwxxyz.i42:5ydlc g id 0c5 py9t circuit,

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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 indu:w3 6jcxo5m1,va6t5m xd gtezctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with 3om6z g65tcav ,t1d xx wj:5methe 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 d lz9,/ vvxga;battery of constant terminal voltage. At the moment contacg9 /vdlv; a,xzt 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 and resistance R is connected f*oy4a s)( fn.cjhc 7ip 5mzg3to 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 to an 0.5vkd 4gharoxz5m gag ici-;2lfd,* $emf$. 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. The time cem3dwz ( :p-bqd f9w0 bbm37;+2a k6yonquftyonstant for the circuit ry-9m qn+w6wkdu 33bmp f7t:20zf abe;b(y oqdepresents 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 inductor are connected in series to a battery. The batteri*ye, 4bdsm 1 7dvg0 xc;6x jlzmd.f/ny is suddenly removed from the cir7ydgb lid c 0m.d6n*1j xe4sf/x,mvz;cuit. The time constant for of the circuit represents the time required for the current to 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 *mjt t3,vf er8same 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 bx4ri n;1m* vxl;lo ey*6y*r5r 4adh gthis 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 AC power supply. In this p4 *m;6stfkd*wyebpg: aw 48kcircuit, the currena4g tb6*: pf s8d;p*w kkme4wyt

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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 changesk h3a6y9h: y7ggzy.ff by what factor when the frequency is tripleh y7:gkz ygy.af6h93fd?

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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 doubl rne7y.r *pn9o4qfc9p ed, the inductive reactancfon*e rpq99 .y7 rpcn4e 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 inductor approaches m zph0mm55b+srat1 4 uzero, the inductive reactance of thap+h0mt rm s 4b5zmu15at 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 to8l7cthi 3.nxer dwk8 . an AC power supply. In this circuit, the current.w8lh ckr dei.t7x n38

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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 the freod bn 6uy on86 8j4mdhl)p.2kxquency is tripl 6nnu ho8md2. dkyp)8 6j4blxoed?

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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 approaches zero, the cfif m3w5+1wuqn 5z:u6 hw n*hfapacitive reactanc ff+zf whq6i* u5w5 3nn1w:hume 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 voixt , i5e)4pcc.v i)xoltages of the inductor and capacitor in a RLC series circuio) xip.xtvc ,cei4 5)it?

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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 cir*i z*/0z by 4 swvmpu49whb(xbcuit 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 circuit increases if R incr/yw6o 13 3fkzfzx:* )wfo(w9z r2komv *msg fqeases.f2r fmqwox oz)sg*(m3y1k9v*z/o fw fkw: 6z3 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 cjp-58zh ap6kh4t b(sk0eo5r7r5e o acircuit 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 gh1ty:1uj f 9mincreases 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 L+ cjx a1wgl05s. ,wwwuRC series circuit, the resonant frequency of that cil cgswww5 +,uwa j.1x0rcuit 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 an AC applied vd *ezt8aghc1: oltage. 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 circu+;6msa o4lcc ppvggmg9:gd 3+it 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 rotatino v 2o;a8++wwjs f0vvcg in a uniform magnetic field of 0.20 T. Find the magnewovavwo8+fj 2;v c+s0tic flux through the loop when the plane 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 magnexwrcx:q *lwqn; .2(fctic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magn c:(cx2qqxw*fw l.r; netic 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 u6c r9 qwiyco .e+t4ls.niform magnetic field of 0.20 T. Find the magnetic flux64lqsower. +yc9ci .t 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 area of an adjustable slc zcc (d. q:m4d 3jpcwqlr*c5msb 473ingle 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 changexj yc/c2ni7 x9s 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 wrw: b.a- mh 9gn5em3pcire on a square frame with sides 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 -chmp3gb 9me5w: anr.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 turns and an arzr +sk)5s sp8mea 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 gtybg 55 *vj3u$0.20 \; m^{2}$ 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 horizontall.cz)msvhv(:5w: -7kixac0sc mca u 9ky at a location where the downa zkmmx9wc: (s:v0)7ic. c5kcvus-ha ward component 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 velocbufcqya5i uke ;8f/94f5 w.w wity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field of /wkue4 b9u8 ;a. iyff5 wfcqw5$5.0 \times 10^{-5} \; T$. 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 loop7b*9olowgib4ro bo + ,s 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 wire of areax*.j n8v(upc u7c rlk06yca l(n ayq)/ $0.090 \; m^{2}$ 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 ar,-xz ;mw 2t05whnwnfsq-e zk 9mature. 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 outpknmz xw wet9zn-,2q0sh w;f5- ut 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 g je-0f5h dgd1l 6fn6g)x/+ zncsr; uyof 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/f*iwt u +rsf1w)uz/w a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotattw+ *i z/f)frww1 su/uing 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 genm/r177 r adabverator 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 o k3 ix;bygeu0l.-+/u1yi rlj 6.00 W. The motor 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 res/ dc d ya3drcsc(da4.9istance of 6.00 W. The motor operates on 120 V AC, 4sc9yrdd3ca/c.d a d (and when 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 6.0 W is connected to a 24-V p+:sw br;xhm*j ower supply. The operating current is 1.0 A. What is the stxmrjhbs* : ;+wart-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 6.0 W is connected to a 24j 5z1jl.yv xm)- f4 ptucq5/qp-V power supply. The operating cu5lqyp txpq cvjm)5 f .u4/j-z1rrent 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 internal resistance 6.0 W is connected to a 24-: cwd z rnoc kszfb ,26r,t21;z2xc;qeV power supply. The opez2,zbkredzr2 n x os;t,;cw6cq12 : cfrating 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 reds;dlw3s msa,y b;wl5:uce 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 transforu mk1 paq4,k,nmer causes 14 A to flow in the secondary. How many tur kkam,np,1q4uns 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 m3 5lsq/xx 7e.ncprp2 rany turns are necessary in a 110-V primary if the 24-V secondary has57xr xlp/es3c nqrp2 . 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 primary coil and a 2000-turn sec hd99*f+ f1bita6fcxiondary coil. If the current in the secondary is 3.0 A, what is the current in the prt+6f1 *9if9hd ifab xcimary?

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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 1knz0j f5go(;i 2mfb fk( wxp2of a transformer. Assuming 100% efficiency, how many amps at 24 V can fl0jk2wfgpi k;ffn2(m(1 ozb 5 xow 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,e/u 3uc8jebaa -; dr3h;tgky9;e qqy neon sign transformer provides 7500 V at 10.0 mA. The primary coil operate/gd,9;y-c 8rjtq ;ua h uqye3eeakb3;s 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 300 turns on its secv p)q eckll*674pqa 4vondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is presentlpk v74c 46v)*eaplq q 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 tur/lj ul (9qo08sil qrk)ns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied 8l0kuiqq9 )rol/ (sjl 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-i px2zdk) h,h 100 turns and its secondary has 200 turns. If the input c) dhhxkz,p2i-urrent at the primary 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 haskq c0* j3 l4ip.hbn cog4zbu0/ 100 turns and its secondary has 200 turns. If the input voltage to the prii 0 ol h4gqc/.cunp*4kj0bz3b mary 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 has 100 t/wjodpv2:flpc :d(8b i;mr p. urns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power outp m/;.iclrpjdp2(p b:fw8d:ovut 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. Tj:5tudpub8oc(s- 5i7lcvtpu+ hs p7 5he 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 tl 5cu s85(-5 cit: vsjud 77hppbpuo+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 c d/qs 1 ;vce:ijfczshvac8 25j*x44n kurrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total rejk ci85:1czv;jfqxe/c *a4ns ds4v h2sistance 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. The voltagee;h h d*3e *;.lwv d9inuv 4rk5gu:fbe is usually stepped up to 4500 V by a transformer and transmitted through a power li*h 5d kgee b;.rehwd39u4;nifvvu l:*ne 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 rk w b*j2r-)rwl2 cm:nrj3hi)fju h/gvd 5q,*besistance 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 the transfocju2i/j- rqw2,bj nl )3 :gvdrkbh5*)rwfh*mrmer 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 kmhm*-b4nbz8 +(dd/ sx+ vhg:xxh4ll wb;nc- l x long has a total resistance of 0.60 W. A generator pro:+d-4; x/8b gwmxlhsbcz+n* vh-lh bxx l(dn4duces 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 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 transmitterbbn0 6h rz5b:d down a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 1000 :zr65n rbb0hbV?

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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 2hivy1f i+vvm5qi0,8 y0 A. It is to be transmitted on a line with resistan8i 5m +vi,hyy0 v1fivqce of 0.60 W. 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 carries a current of 5.0 A. How much energy isoh1i( :a.d,bs*jib, juvkp /z stored in the coil's bpudh,z( i,jk a/.v sio *1b:jmagnetic 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 anj(0 pam3z(l yi)abpf0 18-H inductor. What is this circuit's time constant?ypa(l(3 0) a0imzbfj p

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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 rms8c6-5.hz7u6xo0mmwn 9d;rf gwwgajz 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 )bp:r3es-y n 8f am)pmoutlet. 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 5ycv nd/58 xviis the resistance of the lamn cixy/8 dvv55p?

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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 supply. Whaa*;be2 tic,1gowq u1et is the peak current through thceiut o wq;,gba12e 1*e 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 power disscczh (*e8r k8cipated hc cz(c r8*e8kin 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-W6lyvn:z 7ml gn5)nxbry-a/hc)7pkmj5 l kg(9 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 resiset7pheg08s q n-,r2dntor 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 hr7/src)t0k3-trp :z5wih w wdg-bf)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-mHs9 zlx19bf/a*sqn+j s3vew44uut 7xx 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 2thr)e t5 f n8qpf u.h5*uo8dw7.50-mH coil 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 coao1 8tl-x vhydc6c(fg5p8m 9gil 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 necessary for 157 W of inductive reactanc w4jd7) vzx:zww3qc6je 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 V A7 *himbs u1)zqC at a frequency of 20 kHz is applied tu )mb*sh 7z1qio 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 thrs/ 4oham6 ,mzaswiyej,333rm ough a 2.50-mH coil due to a 110-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 reactanc(ql v+jf-k8fv e of a 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 j c:ym0)sbca (rv,c .dzo:r/lto have 50 W of capacitive reactance 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 10y7ib 3 6o;r)civ7xambx)1 ik d-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 5 mblii ) 1;l5 xfmd2nqb3n3ay0.010-mF capacitor be 100 Waimny2x 3im)nb55b3 l;q d1 lf?

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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 throu dwd ko rh,/dnae)43oy*.0p zogh 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 ser;d ig3o 9lo;lwies circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactanil od;;g 93owlce?

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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:s5x wcirc+ c3 if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serie i+w5x: crccs3s?

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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-mF k0jdv 1i*nbaf *fdqt ;mnt-08 capacitor are cba8fv1ntd i0q0*;dnmj- t* fkonnected 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 wit/cn. ,zs fr(:whbef/3g/naj f h a 20-mH inductor, what is the im 3nfrn:/z hbaw j./g fe,/fcs(pedance at 1000 Hz?

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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-mH inductor, what h c; t. qld7x /5)l9fmrw4x*onbi7vt mis the phase angle at 1000tv97xlm );o*wlrt.x/hb n7d 54mqci f 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 needd0ws5ab p*y6jr8eu( wed in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedd*y0 as(5b e j6u8rpwwance of 100 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 capacitances is ne7 a,jk9zzo66c8zqmh yeded in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hzahk6 7qyc,o jz89 6zmz?

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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 j w n89q5rzty97uk, vi450-mH inductor at 5000 Hz for a totazy q9w5itk7r 9nv,uj8l impedance 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 in series with a 100-kW rz wx1bpgyw2 z)8ypq23)u +kxxesistor at 1.0-MHz for a total impedanc)qu k8g1p xwz2wpz+2yb)y3 xxe 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 serie8mlr8a8 hl :m w.mxa)hs with a 20-mF capacitor. What is the impedance at l8)alx:amrmmw.h8h 81000 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 neef,5zi,-z7c6woguo, la tjx sz2)nvl7 ded in series with a 10-mF capacitor at 1.0 kHz for a total impedance of 45 W?stoi zazc7,5ljf7o, ,zn -uw)xg62lv

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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 kz 19bfvv9dr*4 gr(o-k cl3bqwith a 10-mF capacitor at 1.0 kHz for a phase anglegvfc( rv3 kqzdrlo99bk1 *b4 - 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 with a 30-W resis, nyumzt:d+ho5 5 cg;ntor at 1.0 kHz for a total impc5: y,mg nd+;5noztuh edance 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 2u4; sagxtbr *4ot 9kfa 100-mF capacitor at 120 Hz. What is the phase an4 uorkbtax 92sg4tf;*gle?

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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,,/exdcz x12ezyb0 k, h 20-mH coil, and 1.0-mF capacitor are ,1zkzdhe,/ eyb20 xcxconnected 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 circuitd/ vs1hobns6isy758db k4;se consists of a 100-W resistor, 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 r85e/s7 hs6odsvbkby4;dn s1i ms 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 of capacitive reactancrj8 gu cl-iq6w2:j f7ue 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. Whi:8f7cjw-62u lgru jqat 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 9guuvfx2p ji-0 ,c2aja 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when ap 2ji,xgj2v-c u0fu9connected 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 resistor for a phase angln py/6g 1:d) khojqtp.a0(ooybw3gq 0xuvz 85e o3p6 k5o. x q1pj) bzay/od th:gwou8(qnv0 yg0f $40^{\circ}$ 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 whah st;iu-1 2raqt frequency should the circuit be driven in order to have maximum pohsr ;itu21-a qwer 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 Wap5c:ta0iht+lm b9 d.v ef2 px2*sz9 d resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, h5 xspfm.ai2 t2be0*c9dtl:p z+da9vwhen 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 cirwexdxitq,;8w -k1 l+9vbrt w9xx q 8nk),r-oucuit 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 +d6u hzejq1 u1j cb* z 00qtz00pfho,kof 60 W and a resistance of 30 W. What is the power fa c0h ku 0 epb0jdztz,*q0+oujq611fzhctor?

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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 50h0dzdf fc8 /g4-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when / ffc8d4zdgh0connected 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 -5hoa4:6aj-exc z1bnrq eu3b15-mH coil in series? e-4:5bc ha6e3ua z1nx jboq-r

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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 e kbyqz*pv -fmjv./,8es/5 iqjklg 6:resonant frequen8e* -v.:mqjiz lg5pfy6b/ qsk /kj ve,cy 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 wisrx*g, a4fv2s jgoo- .ta7*dith a 3.7-mH inductor for a resonant frequencyog* 7a4i-.od2xsat,r*s j gvf 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 inlgl2i*ppn -hko *o1 t,d(hbre ((c1os series with a 30-W resistor and a 40-mH coil if the resonant frp ln(s gb11*op, i*ocle 2hho-k r(td(equency of the circuit is to be 1000 Hz?

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