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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 magnetic flux e +1zlrg3by e-oxcept

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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 t fqkdmslee/fu1 te,y/ , t: g,9z1p*drhat the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wi:v2fufiygt:i84kx y5re in a coil produces what kind of change on the ind5:gx y42ifu:v8ifkty uced $emf$, 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 loop of vgd :xqm) )8stja;r..qcuu p3wire produces what rjupm83) g dv.ct)aq u:xsq;. kind of 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 produces what kindq9*n*hk6x+.reuxj a s of change on the induce6 n.h ux*qxra*e +9jksd $emf$, 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 mab+rc-j0ds tpk qp 49m8gnetic 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 directior9jv odw74; 2bw);kkp)pcqmz9k / vp zijo 6j9n of an induced current in a conductor will be that which tek94)k69wmjkzw29/i)j7p v zpop; roc;d j bqvnds 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 fl 4v zbiag 0irlxw7)mf29 cr)w8at on a horizontal table. A bar magnet is held above its970if4m)vi zxa8)lwcr bg2r w center with 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 horizontal table. A bar magnet is held2., dj9e psh 5e jn*zc0c(hr-s8jionb above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from abop 9s -ncdz(c*nhe.ie8bjj h0 5sjr,2o ve)

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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 m+a;vlluc jt 0.b6/gllagnetic field vector points straight uplc 6ju l 0lv;blt.+/ag. The magnetic field vanishes suddenly. 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 fiu44 zjuz 2zf co*3772dwkxnk ztn(w/weld vector points straight 742xuuwwof zkwz 3nnt(z j7kc2/z 4*dup. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where iqg9g;7pt2cw the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from a w9gt pqgc;72ibove, 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 oal,4amrs ra6 7n a horizontal 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 viewed from above, the induced current circl6a4s mrl a7,ares

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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 entqk9)cm4m n/k tering first. As thn9 m4m/ qckk)te north 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 about anzj4(hr8 x 6bud axis whose direction can be varied. In a region where a uniform magnetic field points straight down,z 6urb84d(jhx what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant yy43ausos ;vo0r05 qs( gi;gdangular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what 0 svdsoa; isg04yrgo yu5 3;(qmust 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.l 1c6l qbxu.ey;3tq0k
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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 thatnicmlye2 -nw 76h)-kc pgsa13 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(ou mwo4eg+ +n magnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (orie/dds f9+xk1dwk* *peu *pqi9 lnted in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement*ppsilk 1*k+9 9wddx* q/ud ef 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 rr(36ydv:f6jc w3 wufpotates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transfoijpxb yb0.s* y/klh-7mf8d dv.)4ub7 6aypch rms

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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 s5edbx ujbtp5;4 xo* m9d*) pyp*t ffn*econd. The frequency of tho;5**bbxd*59 pm ujdpny*)t ef ptxf 4e $emf$ 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 ig*:n)gq q m8(ucw 2gzto

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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 dev4g/ ob,cho:q oice that

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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 wmb ss44g cn2)lb )s7hcv5c1msecondary coil contains more loops than the primary coil then it is am ssn bc7c1mlw s)v4h4gcb2)5

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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 loops than the secondary chsv-kv9 vjn)9 k8vrn) oil then it i8n)h )jv9-knv vksrv9s 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 powex:zc,m7pn pn8p 3yi;mr input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant ci am3ja5za21 dky )5;,,afys 9gvxtyox8bo+ ujrcuit,

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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 to 4 ./4b,hzf -wz +fdmhkueh.ny an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage ahw.e.44fhfd k+ yzbnmh, -/ zucross 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 are7hdgzqwuf p3ygh; ( +e2y*gr3 connected in series to an ideal battery of constant terminal voltage.ypgz;3gqf 3hghuyd +(*7r e w2 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 inducta 8-ne i 0ehqza/t7k2jxxm6fh4 nce 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 resisxa3z a.tfoix vd(aesi 43 3q(-tance 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 inductor are connected in series to a battery. Th*faebi5ru*wgn x1pl 5i,f .p z ferh3/g/ .ko3e time constant for th,l5a ozr/irhn53/fgkpf*w e efg*u b.ixp. 31e circuit represents 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 battery iak s)i; c* 7lbfiw u7d6b/s:pusp )bkcdsiu76fu /bwa :;i 7l*s suddenly removed from the circuit. 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 same unit; oy pz:i3i2ya: ennf.s 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 t3f39ytwhi;qlfy9e,i( i t pb+ o an AC power supply. On this 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 r7kxq z4 f tc8y dl9.1z38lzztthis circuit, the current yfxtz tklc1qzdzrl8 z8.39 47

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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 circuiow t v h0w34(yfs68z-hzvty9l t changes by what factor when the frequency is triphw6svyyz0o-(3h z 8 vtt9w4fl led?

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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 doubwwdgim/t 11x9n- h9rw/ 6bi wfled, the inductive reactance of that induct-ibm/ ig 61w9hx/91twnrwdfw or

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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 qv;f-ameh5vi7 -,et0zqni g( AC voltage across an inductor approaches zero, the inductive rea- z7,he n5qm(it ;gvfv0-aqeictance 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 th17jwtrktns 20v 0)f ;o id;aqxis circuit, the current o07s; wvjdir1x 0 fkat;)qnt2

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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 circui nyi;bqv/sj9: t changes by what factor when the frequebs/;:v 9y jnqincy 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 approaches zero, the+t4tsa t9rmue rf)8g 8 capacitive reactance of ttu49rasrt) 8+eg mft8hat 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 inductor and capacitor i2-q-qy*oic nvn a RLC serien*-y-i2 q cqvos 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 7raw k s/rq9a0is 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 impedan6, 51do4lq qdsy6ri r;qptw-e ce of the circuit increases if R increases. When id,ot6pi5; -r swqeqy1 lqdr64s 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 incrsyy./ dx :zlp)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 ci37wnv/u dn1 ep.)gzwq uu 2ga)rcuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitjagd1hl 92qm2) n 9prkkd*;bo ance both double in an LRC series circuit, the resonant frequency of that kh*92dgom)qa29kdr;bn 1j pl circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is mqgyt 9kx9o*n4+xb n*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 circuit occurs wheute,l/ 6s/h;vnc. gpa n

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rota cuie6 uqo6.2cting in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loeu .u6c6c qoi2op 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 uj 0e v2 1d 7ab7c(vj.f9b8fsn2xrxyx a uniform magnetic field of 0.20 T. Find the magnyv0 jfrxx 1ej7 cb22 snx79 b.a(fvud8etic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10.6mso m-cke)-pk c,f k35nlu*bqie-f m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the fk uki kp3enf-eb . m,-oscc*q 6m-5)lloop 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 amqqtvlr 6;)u,kd-kv .n 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 coprmcgwzi;oh3o1 f 0zt ;t9k4(il changes 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 square frame with sides 1oigbpuc:r2 fm y7lox. m 1222j8 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 8.0ogy cb mf u.r lx212i27m2jo:p 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 turns and an*fk 4imv4 +ak tt0f*uj 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 arey/flpr*dyd :) a $0.20 \; m^{2}$ 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 horizo8tq+x.m(g sd a syh;4nntally at a location where the downward component of the Earth'sqnd4ym+s.xsa; ht (g8 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 a; r xoh5hdqt.bl.nhrd/5l5-vngular velocity of 2.0 rad/s about a vertical axis through one of its.vo/-5xltdrn 5r;bhdl .qh 5h 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-sectikmf / v;.)g)xanz(+ucnu z3 tyonal 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 10j1pa1 uqs-n ahf4g-ze.j 0( zj0 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 armature. Eac 6sl:suby9fz 0h 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 0.30zuysb9 l:06sf T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consistsbwn pjl/;.*m11kmpv c of 100 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 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 simplen*g8c9/hzb, dob4xln g s(e9i AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. gzi9(b4*,d/8nol seg9h ncbx 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 gg(lvi 6j4p1lt0h8nvkksby ; 1enerator 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 )wjot3 ujj .y0have a resistance of 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 v:fs/j/des6z have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at f:6 fz/ sedjs/vull 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 w.)qeb5 h)cjxto a 24-V power supply. The operating current is 1.0 A. c )q5)bhxje .wWhat is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to .v q e4cgr2bb(ex 8x8wa 24-V power supply. The operating current is 1.0 A at full speed. Whatbq8c br.(w84g2x evxe 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 6:3haau1a +ch7wt aoy8.0 W is connected to a 24-V power supply. The operating current is 1.0 A ao8cu+a:wa1 yh3t7ha 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 b t* - jv2p1vs/4,tmiagzc2eq needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a 6tbtd+/q8z:2kuvxm9t6q yh u8 csm5u transformer causes 14 A to flow in the secondary. How many turns are in theqsz+tb d92ut6k8u8 :u my/xqv65tm hc 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 in ax7unfh8+9+ gmpp9lu6lzt ; wf2xett3 110-V primary if the 24-V seconw8fh9t2 tgnf3u ;xt l+u7m6+x p 9zlpedary has 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-tu8;fv+(y6g4ay)b2 gfd z avker rn secondary coil. If the current in the secondary is 3.0 A,a )arekfzg8yb+v 4d 2g; f6(vy 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 o1 )tde y7zledr/w.1aqf a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the seconqwde /y e)t 71dl.a1zrdary?

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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 transformer b5b3 ehtc3qph:;cxu zt ec/0 5provides 7500 V at 10.0 mA. The primary coil operates on 125b cbcz h;uh3 0ce/:tpq5t 3xe0 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 7qyack (70vlo lxr9 /chas 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A isr v7 cckxay0l7o9l/q( applied to the primary, what voltage 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 primary coilev (ko qt3pf7gr.;trj(bwi8 / and 300 turns on its secondary coil. If 1 r/7;p((kj 8.ftit vg3oberqw20 V at 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 its secondary has hp4z 4d y9d t5u-7scpr200 turns. If the input current at the primary is 100 A, we ct dscdyr p hz5p47-94uan 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 tran c9y;3 (rq wcx8h 8agttpes,-nsformer has 100 turns and its secondary has 200 turns. If the input voltage to thew,prte ; y -a3c(t8sgcqn8xh9 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 hac1bh3y7 7 /y ettoj:izm+fr,m s 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the second7i yy7 tczrbehomm+:,1j3/tfary 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 voltage is p6oujt 2+ .n; 1bsrqwpusually 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 primaryu+ ;jr1oq6 nbs2 ptp.w 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 V. The voltr .*+, m/(nwxyso:n- q kyel3cs4comuage is usually stepped up to 4500 V by a transformer and tr: k ylsc*+yr4ws u3eq , m.ocnm/oxn(-ansmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of curn3k8j z ;r,ukurent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the perce,kk ruz3u8j ;nntage 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 resistance of 0.6dv)m o/7pxa(i0 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heatingp(x 7advim/ )o 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 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 oc)r(+:- 0rt +ru yjt8hagx*(vlpg xkof 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 ogr0cott :aly*pxrx+ g8vu-+( ) rhj( kf 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 tapuv -+*uv),c2 l dacless power would be lost if the power w*cudvlpc vtaa +u-) ,2ere 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 f1t-*t/m.fnpb6zza1sz k(- ues p7hrg61 zd g 20 A. It is to be transmitted on a line with resistance z7( z6-ef d.*rn-buazm1 htgg z11 p6ptssfk/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 is stored in the khg )i9n6xxf.)u3,ck 7pfc pqvld s 35coil's magnetinchf7.d35lpsxkikp v,c69) g q f3 x)uc 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 inductor. What is*4w*; -jjszq 4nknuju this cis*k juq uz4nj- nj;4w*rcuit's 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 inajr * 9fydu7z2 an AC circuit where the rms 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 outlet. s am213, k p*4byiexkb 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 is8+c4jhu : hyra the resistance of the laa cu8h:rhyj4+ mp?

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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. What is the peak cxj iv hkfvpf/4w1 w)i n2yq5:(urrent through the resistor /w4v i:5jqw)ivp h f12n(xfky?

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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 ypy3t+( fzghw, jb(fs5r / so0is the power dissipated in the resistor?ywj+sorz((,/ff5 py bths 30g

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W res .fr-grrc6 fgl7zu//bv,0y ysu51s rhistor 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 resistor iszivtq:;fi tejdc;u 46av 7-, s $I = 0.80 \sin (240 t)$. 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 0qb (/4ebkfc,d m lr)8ul qyv3is $I = 0.80 \sin (240 t)$. 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 inducto8/q i qw .pl8dan i f+(:vukxx6i/gn/4sz+vjor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1000 z3bsc/r q9-/g6rm vy dHz?

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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 ln7 )g(z-wbjx,2ltt b 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 inducs-k3f5sd. 5w kh 3zjedtive 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 V AC at a frequency p gdtmh*j, a jzn-vo4--mly65 of 20 kHz is applieddj-t,-njm 5ah4mz g y6* lv-op to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil dueh2nw l )/ral6dftp 9c3 *0fema 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 reactance of i p,7rdd 0mlgb+j98 yma 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitidpaz6-7gbr sz7et99 eve 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 10-mF capacitor have a reactanpt9he 3, 7vqjoce 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-mFs m x,- i d9(be.iof)lvws;q vz2,f;bn capacitor be 100 Wwm; dq, v9) z,nf (lioev.sibf2;sx-b ?

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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 th 2 hssbm,tb7f8 1zr3e v3ork5crough 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 resistance, 15.0 W if . :cqt4yp (y6sgpolvd ir*21nducpd:viy.qypc s*2l1 rg4ot(6ftive 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 impedanceq ppqhrd-9gtaa0 /nn6bv 8*p7 at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor q rt-*vpbnag90q/p8dhpn67 aare 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 1500 Hz if a 100-W resistor, 20-mH coil, and 1dmyvmlpc537 sx/e/m2/w2bq f .0-mF capacitmcpxe /m5v qb y7fd3l/ mw2/s2or 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 connect(ecylm k6- ku-y ,.kwqed in series with a 20-mH inductor, what is the impedance at 100k.ly-6w e ( myukk,-cq0 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 20mwd;ur l/q;2j:gm 0cm-mH inductor, what is the phase angle at 1000 Hz 2/umg:mr ;0 cjql;wmd?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needz;.2- if ovu ewi2za irav.*,bs( zrs;ed in a series circuit with a 20-mH coil and 1.0-mF capacitor for a ti-r2f a2zi., (v swar vi.zeso bz*;u;otal impedance 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 followingc9k 0fpqri2p + capacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110pir0 fcqk +p92 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 50bzegpje 6p-qvy)4-+k00 Hz for a total impedance ofe b-v6+-q) peg4pyzjk 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 +eg bb.off w3 l0vs2d4with a 100-kW resistor at 1.0-MHz for a total impedance of 1s 4w2gfbb.0d3 levf o+50 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 capacif*f t, k:igwap9lb33k tor. What is the impedance at 1000 Hz*k33,g:pi af9ltk fwb?

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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 auhkg i.;xzg.. xh i-3t.g; bxws7 8bgx 10-mF capacitor at 1.0 kHz for a total impedance ofig b.-u.git. zh k78xx.g;bxs3hx;g w 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 kHz forbcid3:x5 y g,hk)/adl a phase a,/)xd di3kl bghcay :5ngle 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 w8: b0bz/ (-r3;izv f0odndb knpll: euith a 30-W resistor at 1.0 kHz for a total impedance of 4k-;nl( bd0/lodp:v zni0 rzbb8 u3 e:f5 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 iwj,ru,cikk 0 4n series with a 100-mF capacitor at 120 Hz. What is the phase i0kr ukc,j,4wangle?

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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.;nsv ls.i:2 hp)ugyiu (9lryx2mr0 h(0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor sunmix2rvh2h0 ylp9:iryu)l( ;.(gsare 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 rj p)mr/fa qb:sgnic--; q +s7zesistor, 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 t +; -q -:/sinar fgpc7sqjmz)bhe 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 capac2/ ,oovwx*3yduyul bs-:j ocrr(p42 vbz m,x)itor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz py3ozx2 -2 cv ms, ur)o ,:y4b*lbvdprwux /jo(ower source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit contc2jwk; mt/;9e q,uwav 9mb.pgaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductom w2u;g ,katqw/ e99mbpj.;vcr, when 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 resistor for a phase angle l6 nddec(x5 vs/pd*(oof (nc5p 6dsodle/(vx* d$40^{\circ}$ 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 what frequh7e/ol 5 neip .(bubd-ency should the circuit be driven in order to have maximum power transferred from te.en/uol7bh -(bipd 5 he 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 serie:a 8gn:yz5szis circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacinyis :gz:z a58tive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circu7vvr4l+er frwn hu (9lgq2zd5q(sv+01 vl1ot 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 impedance of 60 W and a resistancs-m l:wyioho)1 n8,ft e of 30 W. What is the powerlo) 8hsy otiw1,mfn-: factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50km*lo- y nw(svf j;0kx5j kx,9-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whenf(k 5no-jy0k;*k,9lswx mx jv 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 seritjg q loz+vx:tapt,5hw3623n fep8b3r,e8jx es?zj 3b+ ,,exrveqlf8a63w5n8gptx3 2p h otj t:

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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 s)** taqmhgk8 yeries with a 4.7-mF capacitor for a resonant frequency of 10m* 8) yahg*qtk 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 serie. s4 wbujuxl+hd;ef6 (k)l*bls with a 3.7-mH inductor for a resonant frequency of ;e f*su d)wkx b j.lbuh4l6l(+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 a 30-W resistor and a 40-mH c *qnv3* b+xssuoil if the resonant frequencyq ns vu*3xb+s* of the circuit is to be 1000 Hz?

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