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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following p3tqri-j dw1p5 iu+zp9*o ne g 977kfuare 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 sta h:ga2z.zs* e f/rcd+btes that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in ape ldkdi , (*h-8pxi2a coil produces what kind of change on the inducp8da* d ikel(x2,-hpied $emf$, 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 wi1 h: g59 .a8cac wp-q+qxlyzf)wbzr.z re produces what kind of change on the inducf)a5+qwp :wy9 qzb .zc8ar.-gxhzc l 1ed $emf$, 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 kind of change on tnmzfohmk,q7e( r0 lq 5kb9( 7ghe induced qzk lgm,b5m q 7(9e7hok(rnf0 $emf$, 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 (8zdf/ -goaupzv 2y d7 em19pjmagnetic 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 conductog9hvo,wobl+7; zd:jb 8p0 bqk r will be that which tends to produce which of the following effep 9 78+j b odg;vqkwhozbbl0:,cts?

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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. v bfb5 w8q k) n-fzoum.wbn8+; A bar magnet is held above its center with its north pole pointing down. The stationary b) bnz wb5m8vwfoq8+kuf .n ;-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 h*-eiud;2pt9qgw34ovyan 2xbar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falli*th9dp; ei va-g x3 nq22w4yuong 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 r8jx6z6ieecekr;u n9;n1*m d bfqj1/ table top in a region where the magnetic field vector poink ;ifen61e;m jbx/d n9rz 6ejqc8 *ur1ts straight up. 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 field ve 1n-s;9wmt2d060mb qfqp aso,7gca r fctor points straight up. The magnetic field suddenly grows stronger. When viewed from above, what isag d0c9qa tonqpf f16r bm-0s2;7,ws m 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;dcjeu )wr uaud *:n+65kwq7r a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?7ru e6dq nwd*:r+jc u;)akuw5

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-incr(p 9;vp (u2;jc ao5fayky )pq4c dv(bxeasing current northward. Two coils of wire lie flat on the table,x(c pdqoy(pu)f 5av kb 2;v( cpj;4y9a one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole enterix /np- 0e6of*vd;r mtfng first. As the north pole enters the wire, the induced current will be (as viewed from 6xe*dom- vftnp;/r f0above)

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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 chlq zkqecs)x *.1mi-3onstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field poq.k3)1z-xis* mc e lhqints straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed ab3e5* smyrxwgq dntao7(3ak:7 5xlmz +out an axis whose direction can be varied. In a region where a uniform magnetic field pointmwd:e n7 35 y(rxx5gos+zt* a 7qakl3ms straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.6k)mp.xhq7 wiv 4vw 8ffm q3j8
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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 k5ebe. v;smwj 8* g dsk;p0j0qan $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic fievx4s)v2 s:sm tld. 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 moved northward at con oxxo wc-qfx 2.4b;7osstant velocity through a magnetic field that points straight down. Mbxq.-4 o7s;xo2fxwco ake 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 const2og2pkalqvt9 i :8l4lant 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 transforankm b1 a/ 14yj 4;sxqd3uti ms(7.apams

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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 se (i1)joma; t0 eceamuz1kou) 0cond. The frequency of the 0mk1aez 0 ;ujo))uo1tame(c i $emf$ 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 ueh/4ygd;xz( x sed 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 devicoofh kof:,45,9a w 3zfku 5kdie 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 thecj5 7m sni/ z-7zlyeb3he:c tkw7q:z;0hgzs; secondary coil contains more loops than the primary coil the:775h;seg- j3/imehztn :zzzwbys7lkc cq ;0 n it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the pri f : p pcv+t*xsdq.z3jrjcn2/;mary coil contains more loops than the secondary coil then *jtxnz.;:3jprp+qvs/fdc c 2it 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 /er9u tu7lk0 dinput

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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 circuypxdzxlq37rkh5;2i kv*u 3. eit,

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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 an idea z4.(fz1t-c n 5yslu6 o cq4w6w zm;mziu/ura;l battery of constant terminal voltage. At the moment contact is made wi owzztyi 5mq cm;/;a(n6 c6.44zz- frsl1u uwuth 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 a a-la )bb+ ill0)rrf4en ideal battery of constant t)l+0l -ailrba4) bef rerminal voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to recltm95:5l44 bwhd,.pbae9 zc9iy kan $emf$. 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 qyg:-.i zmz:p.pcesr8.g9 vy 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 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(6k,qk 6o bscd 9 il98e.tymvq a battery. The time constant for tkt( e.imld qc,6qov986byk 9she 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 swamay whdfvr s9 q(6ujw5/03 qe61j0h eries to a battery. The battery is suddenqq1 5uwfj3 ysrj edh09mw6 va/w(a60hly 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 sam aq,d/yjy:gx .e 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 ACg):4 mrbt;q v-f1nu+ zqt xbk. 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 supplf lr47,1tajp ny. In this circuit, the curren jn7pr4a,f 1ltt

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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 actx srq5;gu/oj36mwy 762bi hg circuit changes by what factor when the frequency is tripled3 ;wgsub5h62gqiytor /m7 j6x?

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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 t +l8otmtgz3 ahwqd3;c8.(ns yhe AC voltage across an inductor is doubled, the inductive reacta8tz8na tl+3d. hqmy(cw go3 ;snce 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 zero, the in3 mgm1n/ nd1x+h 4ktf z1euh/bu+tp5nductive reactancemzn35+ut nfd +k e hb4/mutn/1 g1ph1x 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 connel4h5en .-aa e 5fsnmopq8:c -;w korz5cted to an AC power supply. In this circuit, the currenmz kaae5c.5weqn8lfh- o: - 4on5prs;t

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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 o *pkd4oi3sg7 the frequency7iks3d*o gp4 o 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 capa 3 miv xdk9q g5qhjl:8*g/0kjhcitor approaches zero, the capacitiveid /mjh8l3x09q:5 k qkgvhg* j 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 betwr( i ;xqm5rzo:een the voltages of the inductor and capacitor in a RLC series circuo: xq(ir;5rmzit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is define.i3siae x0e doja 5k/pz0 3ob7d 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 of3+,i vm+odn 5ps ou/etr1z9ee the circuit increases if R increases. When is this stat 3po9oe+ert5szem+,u v1 /dniement 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 cizcbpb.8( 6n, (pxdcjj xr4pn7y dc).xrcuit 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 kcla6gido.g-rj -t;v*2 jr+r increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC soy9 z1- 1. gyp7jzfulgeries circuit, the resonant frequency of that circuly7fz -pyz .1 1g9gojuit 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 voltage. At recr;cl,nf7:kiub*//avs u )a qsonance,

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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 v)5by5bm ox1a+ 86zqsfebjhxm.* v,o 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 rotating in a uniform magnetic field of 0.20654ak uukra o3 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vect53kra ku4a 6ouor 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 unifor7a91v36y , a csqtbwysm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic yssa1vt3 6 ,abcyq9 7wfield 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 rotati,7unp-pwz l k;a. zy.hng in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop ,uw a7z ..lpkznpyh;-and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reducedb( ljp,yi8 5,5h ,sb +lmlhcpd 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 chae 9 5k4jmky-mdnges 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 sq; pruz6+hx7 98th+sux :xkzemuare 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 :pxth6++;zx zr9ku7esmh8 ux 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 turnouoiq /.lty3tdx c 2:7 ltkt44s 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 arew ;c5c ewt-i;ua $0.20 \; m^{2}$ 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 uwq)qvu*.lqfk, n+6 eof 60 m flies horizontally at a location where the downward component of the Earth's magnetic fi6 qw*)v+qf.qenlk,u ueld 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 4n 86 gdq77ifivlre7h tao;s- velocity of 2.0 rad/s about a vertic77ea-g 4d i fhovr;87is6q ltnal 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 hap u4ow* q /4vmwhz;vd,:3 ehtps 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns cpxdi8;p:;xka vbxp9 x2/.ad 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. Each loot5-aql0 ss u5f1dgh6gp 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 volta 6shlds55gt gf1 u-0qage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of arekzb/ufu3+b3hq5g/a o a $0.090 \; m^{2}$ 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 construdd0w zjn6tubwm605l2um5tp . ct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic fieldz2np6mt d05w6twj muul 0bd .5 of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator wi6irb* ) fte2dbj 57f,vtet .s0tte4qgth 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 operatesb.c3 ta.jzwe-f p)u b/ 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 s6s76cz 3kkp wW. The motor operates on 120 V AC, and when running at full speed it generates a bacwz6s 6skcp 37kk $emf$ 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 isdp k+2 zq3nq*j connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up q 2kp3*n+zjq dcurrent?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power s8zgp;:di vl3 kj5qoaqi/0 c2wupply. The operating current is 1.0 A at full speed. g2 vqw;8 zaio l0/35qkidpc:jWhat 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 c -*nedgq+el q/c+ 1sxresistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full cgxen1-*+c/dq +q esl 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 -yalg.d5h2c nis 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 transfod0h3 qou3*yzmrmer causes 14 A to flow in the secondary. Hoqdz0u3mhoy* 3w many 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 necessaf;5tvb h7nd1dad34slry in a 110-V primary if the 24-V secondary has 100 turnh3lddv bs 547a1n;df ts?

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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 primard/ldi9*+g*zc3 w/kta e tk;xj y coil and a 2000-turn secondary coil. If thed/c;x3 aze+d/9t wikjk** tlg 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 primar 3h8fq 3mmwg;jy of a transformer. Assuming 100% efficiency, how man3 3f ;8mwqmhjgy amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 Vz:wmh6xd*k9vs1 0dz( pni: ns at 10.0 mA. The primary coil ope dszd ph0(6:zsnn9*:wi kv mx1rates 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 primek0e58c*udz +;b l3wlzpr*cg ary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secozle *3kc0cr;*dw pl8b gz5u+e ndary?

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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 cz (r 9rvbe8+c 2)ohtumoil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary+m buhcezt)2 (9 8vrro?

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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 +.u ta*cutc0-i i+y1nc *zb eshas 100 turns and its secondary has 200 turns. If + +*-zby0ttc*ncu1 c.ai euisthe input current 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 has 100 turns and its xr;/ 0pk n5-wg ki.bh8fry5 e7vdot, ai0; rpmsecondary has 200 turns. If the input voltage to the primary is 100 V, we can exproph5 rge5 .y-f;nra8 pi/b7i0m0v;dtxkk w ,ect 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 turns and its secondary has 200 turnh /wp(z3ok57m4y fko1qgzb7ns. If the power input to the primary is 100 W, we can expect the power outpzf/3wy q5pb7 kg7mh okz4n (1out 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 cu6 gc z;jmmnmdxl(6g0t+w3 5o w0qsgh- rrent 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 number of turns in the secondary if the primary has 20(o53m sm;0qgw0 mg tx6-g lwd+hzncj60 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 voltage is usually stezxhy6cgds 80(9*nr p+g0 y oa0cr *mfmpped up t90yrd 0paxyo+ fc *h( *zgc8g ms6r0mno 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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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 i+f azv,y +nql0y*9iyhvioz -dw+,+q120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line alvoz iiyzn-y*9vqdi +hw, 0 y+,f+ q+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 hanl b+, u* s)iuh8m0uvnw7luz2 s 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 wouls b8w)z li7v*h 2nlu0 u,um+und be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 Wxfu5; zmzys5jks0 koo.+ ,id5. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltaj z osy.f5,0+zko 5s;kdxui 5mge is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power wjut u4vt6oc t 1qs zw6f(a;l/-ould be lost if the power werej1f/a;cl-ow4vs 6utq(ztt u6 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 aa qcmn a+xpq n1-, 5.bls9no5gt 20 A. It is to be transmitted on a line with resistance of 0.60 W. , 9n.galqnqn5+ m1pc-aosx5b 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 cqg6ln ds bmf,*9 mv)h,urrent of 5.0 A. How much energy is stored in the coil's mag *)d9fmvm6 nb,gsh, lqnetic 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 187r9 +rp+zlp80 vs 1c:x* wgi0ayzoitd-H inductor. What is this circuit's y1c9wl0i*dppvo7 grt i + 0z+xasr8:z 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 12+ 3m7lcb+p yvu0 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. Ws9nt1mdh1c h-9zrsbt j4 aq 27hat 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 outbgc 92h69 cc3fq6cskflet. What is the resistance of the lamp 3c92f c cg9bfh6kq6cs?

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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 connjg/uqq-j.- qaected to a 120-V ac power supply. What is the peak current j/qq- .-ugqajthrough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is conns5s/ ct,kn.iyected to a 120-V ac power supply. What is the power diss5,/cki tsyns .ipated 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 50-W res ;)x)bfqs(sot istor 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 resistorf. e.d9(zqm qz 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 5u*sdf791*b 7x lcn3 -ympdaws0-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a ztj y.(0on- pk;w(tzvz4m lb/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 coil at 1000 Hz?qrfe7:/sv vzl0k5f8 o

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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/n(* kgvr0nvy .0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 1f5uuo9)nohs9s .r 1li57 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor) ge6, peogup+ when 120 V AC at a frequency of 20 kHz ispe+ou 6,)p egg applied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz sourc /+dcg2q)gd 0cw ;hqcde?

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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 of6 u, d55,jo kydjx65ypbp/vzn 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 to have 50 W of capacididdv h,gpz0f: s69p3 tive 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 ha(fa9g h 0y)og8 i:mnmave 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 capacpdg; cgy1kq-2lna43 bitor be 100 W13 dy2gc-gl; a pq4nkb?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz andre ;hg8lp 6er; 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 6,dey +m+e/hmryu bb1 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance? bh+6db,1e +myrmuy/e

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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 Hzy/3gud7 pjgp: if a 100-W resistor, 20-mH coil, and 1.0-mFyp:7gd /3gupj capacitor are 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 yeoqz1 yx0x 0e t;ems24 5u9ipHz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in sexp e9xy5q0t1y40; i z2moueseries?

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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 with a 20-mH inductor, what is )gc 8f( grofqc2n5gy g;/ sw-qjgo-tpad* 2z1the impedancec n5qo;*dc agq/-tgg -fg2zf12)prwyog (8js 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 2s.z c5u/w*nbj uon-k.0-mH inductor, what is the phase angn-nz. uu5owks.bc /*jle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit withf: b d/(v sfskxhmh.2t*9zsr- a 20-mH coil and 1.0-mF capacitor for a total imx*ss/vtk fdz:h(9h m-.2fsb rpedance 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 needed)b nupcy:cazw(;sp q 0zllq(3 3ro:8n in series with a 100-W resistor an lc3wpls )zzunqo8;nr: 3(p c(0yba:q d 15-mH coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH i ) 9iztq2/kseiyyhh9 e c)0r.vnductor at 5000 Hz for a total impedance of 400e).ytsz/i k9yhh9 c0 )q2r eiv00 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 resistorgheue;y51du )o;7dk y at 1.0-MHz for a totg1 huekdodey) y5;u7; al impedance 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 capacid)dtsgc68y 1zjyc 42 ntor. What is the impedance j )4g62 z dctn8ycsd1yat 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 3 +h8r1efy-mt4 wh/vt5jgg5exax+.qfacy2a 1.0 kHz for a total imgcyt++xeq et.1fag854wmrx / h hj25 3vy-faapedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is neededm41up layqk)hp (eb)+ in series with a 10-mF capacitor at 1.0 kHz for a phase angle yu))( b+4qh1 k eplmpaof $40^{\circ}$?

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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 j2fn * ke,jaj.3rgn k 8n/opg8series with a 30-W resistor at 1.0 kHz for a total impedanc g/k2fo p88j 3*,n akjnr.gneje of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mv*u -d.2 wb6zf0w wawuF capacitor at 120 Hz. What is the phasevw-z b d0uauww6*wf2. angle?

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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.0aa x hz.tb7k 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connectkz.b xh.a07 taed 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 resistov8nwuh.4pe5uy*m ux .ja; ai .r, a 10.0-mF capacitor, and a 0.350-H inductor. The circui;*ai u.au.y.j5wn 4m8vhpuext is connected to a 120-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 cz(foi -y ;(uwsapacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in yf(-owsz;u(i series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resiadg0w::9:utwkm n 0ch stor, a 10:d::wm n k90gawhtc0u-mF capacitor, and a 0.45-H inductor, 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 a 1clw f/9sx v33v,*czsh:axtfngle ofxc9f1xvl:,3a c3fs / wt hzsv* $40^{\circ}$ 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 = 2000 tg ,xfxesp.0-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving source?px0s xe,. gf0t

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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 6 jnckv0 stix* a5a;6pcircuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is conne5i6p6jxsv; n kaa0ct*cted to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit 7ig3y9x1qdr: ad/ cshe9 ceg )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 impedanc bf1yf)zil4ks -sh0 h34y dms/e of 60 W and a resistance of 30 W. What is the power 34lysf-bdfi1skh)s / h40 zymfactor?

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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 res1qme 8c5 1cgqsistor, a 10-mF capcs e5q1 1qcg8macitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacit iyxzi 9vq7(0r /z+tlid4)uctor and a 15-mH coil in series? tzc4 ix )y7vzudi+r90l( tqi/

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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 se vu+ z nkj 77t3v*xozksxiijmm.61:n0ries with a 4.7-mF capacitor for a resonant freque7 t+m*6xsojun1vzm3i xjz. :7k vkn0incy 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 with a 3.7-mH inductor for a resonant flg-wa n -gu75mrequency of 1000 Hml g7g-wau5 -nz?

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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 placeo,fjbm8y j9)tbwiw -g*i( 1hbd in series with a 30-W resistor and a 40-mH coil if the resonant frequency wigmf9jt *b io8)jyh,-b(1wb of the circuit is to be 1000 Hz?

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