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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 e-sb8 1asr8 bwl9h9g lof magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that thy .hqefqf+7f n5dbi)tigl dh:n(93o: e $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil prode ,hrayqoircl5yq8j )1.k :+ euces what kind of change on the iir15req+ ,a) l cyo:j.hk qey8nduced $emf$, 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 throughuvpg2 lq ze5ql:(*7b8 yjhv(b a loop of wire produces what kindqhv* l(l v7yzub5(p8bj :2gqe 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 osh4ou-p ,2ihjdcxp+oa d7b*lw- k a3,f a loop of wire produces what kind of change on the induce *7p2 +,3hc iaku-,jsdoxb -plao h4wdd $emf$, 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 removedjkc - 5r-*ralp from a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the dir5gy83stmxk9 m.0us vv;bbn) xection of an induced current in a conductor will be that which tends to pro8tbmsunbsy;mv 5 vgx093xk). duce 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. A bar magnet is held xklr, bznam2 1*./aruabove its center with its north *mz/u ax 2,.alr b1nkrpole 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 tablezwgid j)q -)lf. ng yg+.2:due. A bar magnet is held above its center withw)-jggfeqd ig dy2u+ z.l:n ). its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a:u5 +dtb *swbt otfu-. region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When view5.u- tb*f+dwuo b :stted 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 gop ;4uo+suy. rliek u. 2g/g+a level table 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 the induced /epog ; yogisr u gk.+lu24+u.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 toa5 heg p3cwmn9d+ 05)t cfy*lhp in 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 th3 fpe5mc )hg9d*lc0t5aywnh +is 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 gmf 6q voo q*12va k+xprq 4cgu5f+s95and 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 inducc fqm16a5 2orvx5gf+oqk9*q+ uvp4sg ed 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 y84gc.xf4q6s71)kgg zg7ak fhp+ig o a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from ).ahqfy c 1g g4g 7k7g6gpkizs4x 8o+fabove)

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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 aboush 7wwni41 ua9g8 yop2t an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientau17ys hiw2nwpg9 8o4 ation 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 gmjbg+e8 .uz;angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straig g+b;.8ujmez ght 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.kx p-sk*)x- we
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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 l45a l0*re c sy1otd7sthat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic j1b7ppf: r0gnr3squ 2 ;tc8pefield. 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 dfw;1z3+ ; ptp et;u6o a)mqmqbirection) is moved northward at constant velocity t abtm w+z;ppm3tqe)16;fu q ;ohrough a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angulao,n)k4qebp5g r 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 trbt3z o,oao l)d3ep -8 .i1 wrlcxvf2f/ansforms

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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 secok 6voly wk(k(p4lv, r5nd. The frequency of the 6k( (ok4,ypv rwvk5ll $emf$ 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 devig9cs+ib* kr-e dk75uzce used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a d 2l(t.ug0p 4 vlb4pjlaevice 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 secondary coil contains more loops than the primary0oe7 vv7zu hm* coile hz7vu0 7vom* then 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 primary coil contains more loops than the secw+o/9fm qfaqv9 0xq.pa bfiw*i1g. a 4ondary coiw..9i 0g a*fvi/wa+o f9qq qfm1xabp4l 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;zzno * ./+zvji riur* power 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 na01 .--pedasd mkzs0s.1lh*+xqjl u 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 inductorkjvu jrnsvecnd73 m;:y4 262z bk,j w0 are connected in series to an ideal battery of constant terminal voltage. At the 76;zk vby je m,jn u0sjn3k: 4dr22vcwmoment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor ai)c vgg :m;shs2ka3,cre connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the g c iha2c: v;s)mg3k,sbattery, 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 9fzkst3bly: y; d:nz ,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 resi:s.d +vsyqmg*g- b (vm2x vkt.pmz;r1 stance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor areo vg s2s2 )hw:fb,r:yknfr58k connected in series to a battery. The time constant for the circuit represents the time requb sok,r8y rwhs2fnkv: 2 :f5)gired 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. i(d erne0l-7h The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required i-dr70eel n(hfor 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 ;(e*llndkwh.tc 9dg 9 have the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the curr4n )pcv- y 5ljp7ietv9ent

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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 circuit, th(g7jc*y ; brmijq*hl4e curren*7ij ym4gr(hl;c* bjqt

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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 changes by what factor w6h7j zvj:;ppdr+ee 4edhj 6r3hen the frequency is tripled?6reh j7:;zvj pr 6j3ed4phd+ e

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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 doubdi r3c *8e;,lwb3v osiled, the inductive reactance of that induct, 3vbio; e*wdcl3si8ror

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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, th2a0bw k-x6i t1g u+jn3xnyca*e inductive reactance of tha0ikb nu nx-w a+3ct1*a6g2yxjt coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circu;v0fme9aw9 x3of8b ltit, the current a eo3 ml9bft9w;fvx08

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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 ml6(0-gnxm* blig o j/*kszv7()piuofactor when the frequency is tril*/ 7)(ixb lk *-ivgzmnoogms( 0jpu6 pled?

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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,h, y jgu)nrft1 sf85r8 the capacitive reactance of that capaciton5,hj 8r 1gftsy )ru8fr

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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 3y rty*u k)-cq8)65ud8kb hxv/nwiey in a RLu xyw)k ybqr68du cv)ei-t8*/5n3hykC series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit i u6iywaoj2n s:m lq(:*s 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 t 10ch/vs zb,qs2gh 3 gmjpt)0pmvr8r6he circuit increases if R increases. When is 0/mspgbgr2t6zrc 8vv1q0)hmpj 3,sh 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 i. lc4kjp -sd*wmpedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of theym :wgj,un8d5 circuit 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 doubl5w51/ wuvyaonbl a a(z1bk4,u e in an LRC series circuit, the resonant frequency of that c,5uo54ka/zy ualb( n1 bwa1 wvircuit 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 iszeri4 m:h7x5l a5u4it 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 circui l-1 7p)vz ixuyiessjp8.+* kxt 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 5,:g vzjb3xblmagnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the :xg5 3bj zbl,vloop 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 0.1c /t1m+yw o;wg0 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicul w1moc;y/ +tgwar.

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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 rotcml 5-9ele-j)ba g*l0p uvys:ating in a uniform magnetic field of 0.20 T. Find the magnetic l 5clp -eu0vabm-y :)j *gesl9flux 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 j ot*v9lil 1v aitzh*-36w/zoadjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil chg5acy7g 1blc7vzl4s8 t9 mdz7anges 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 18 cm. A vqj5zv,ia7mq(n(zjwc kh( 4(uniform magnetic field is applied perpendicular to the plane of thek((vv(z jz5jq,7(m nicq4wh a coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 tg kujf6nllm1x3 d m w;q,f-45gurns 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 *e3l7s xf2vvoand area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 7c+fbpbxq4o4g63 q9u lmgz. l60 m flies horizontally at a location where the downward component bzc xqql7ml4f93 .+u4 gg6obpof 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 afy1*po2 wqhm. 6s3pvsngular velocity of 2fqmopsw21.3ph v6sy *.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 c8c) mkkp8(ltloops 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 hhz:st; ;2opxturns 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 loof6(h2pdtc *ym1:n0 yn 7 vpgq3aid.gops on its armature. 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 hpp ny7d:mvy*0d.o 62(agng fi1 t3cq in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this 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;j zxlan5bzy1h/f n ): 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 wishgnzkyilz5d *ci3jf0c4 z+z*z*m7s p - to construct 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. Ifmp*clc 3yd*0jz7i gzf-z * n5szkz+i4 the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a max,;7ilxl ixb 0kdkg ;/cimum $emf$ 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 f1ip n6rr2d ,ja 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 have vxpt/df-4c zy9 dt4 z-*(c ftwa resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a by4xp ttz f-9t(d d4cw*vc/zf- ack $emf$ 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 power supply. 6v or,+cg+k. byfq 6-x2wbjwo The operating current is 1.0 A. +fo,+cr wy2v.6k g-jbw qbo 6xWhat 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 a 24-V power suaup6fsdzw-rr wcth 0bb54)j 2 0r1)cdpply. The operating current is 1.0 A at full speed. Wha0ah5w2 ) cr 6j-wfrc)1u4rs 0ddb btpzt 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-V powel9ji4 ,( yv: sicxuvx 8i5j9pmr supply. The o9iu94ijy m:ivx8 p5js,lvxc ( perating 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-b nh*/u:itk. er3sxv 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 transformer causes 14 A to fl7iq3:x+t/dq bev-z pwow in the secondary. How many turns are in the sezq ix/+qwbe7p:-dv t3condary?

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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 nece maqs/6* yyh m)p,-hnjssary in a 110-V primary if the 24-V secondary has 100 turh *,nsjyahm /-p ymq6)ns?

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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 cotb2,,uvft)row7j+a j y ic7c2il and a 2000-turn secondary coil. If the currei,7,+27vra tccjoty wub )f2 jnt in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transqz72+ m btdn;bformer. Assuming 100% efficiency, how many amps at 24 V can flow inn7;bd z+mt2 qb 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 V at 10.0 mr4i6/ yb *zgm-:aujsoA. The primary coil operates on 120 V. What does g/6*-a myi4 z:rbujso 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 3viwe)85x t3 ,zb: dvua00 turns on its secondaryitvxa8:5vue,3b) zdw coil. If 120 V at 2.0 A is 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 c /zcxzml.z+.c oil and 300 turns on its secondary coil. If 120 cz.c.mlz z+ x/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 itsi8 92 uft hu,ccjgs7)w secondary has 200 turns. If the input current at tjc)uu cwt7 ,fg2 si8h9he 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 secondaryyvoc+hqi6 . l hvsl0zu(+r: ,m has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the s6l+vu+o(0 cr lqv,m hysizh:. econdary 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 transf; 2n g4 0*)j.ey qpu-lb7ispr7mjdcipormer has 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 secondary to be (neglecting frictio;imbl4*g20ue7) q d np.7jpjcr p- iysnal 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 curreqe7,sk w 6twe5nt 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 prima5qw7 k ,tesew6ry 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. Thkfb z*p:po5 2jnb5s:ye voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage pk*bnpo: zb25:j5s yf 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 voltage is usuallgwxdgo2u4 *x a6i;d.q :u0lp vy stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line 2g :*6.lwxdgu4id a;qopv x0uif 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 / qp4dx2f*0xo ncql2s 9/f;xiu+qrfsresistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce q2xs r2u +9ldicqo4xf/p*xqs;n 0f f /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 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 a660( sbuo eddo 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 (ueo6db sd6o0stepped 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 would bety +x //,nxfo7 *:cqo pxpmms) lost if th)xpotpfxmm+/n/ ,q o sx:yc* 7e power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V aw;aruv*8 n aki4s + 1ves(5xwvob+,d mt 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generx dk 8vwa+,sre+a b* vo1sm5u win4v(;ator 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 6. 5 q;cpf rycy.)hj0ykkf:cocurrent of 5.0 A. How much energy is stored in the coil's magnetic fiepkq.c5:yc) 60ry .jh ykfco;fld?

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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 ;rxm,; s l/guq7q2zed an 18-H inductor. What is this circuit's time constx /qe m;lz;sgru 27q,dant?

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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.wu,) p9l pa4 xgu4myo 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. What is the peak curb0u7s:jq/;j g l9rc0l :inrmvrent?

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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 ouhydeb 08 4rzl.ld9jr 9+bsnq7tlet. What is the resistance of the lamp7l+lz0byb.qs 9 d84d9 e hjnrr?

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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 co3*fxpmev5j ac0 egk ; log+4h.nnected to a 120-V ac power supply. What is the peak current thrkglev;ce 0f + *mop 4xg3.j5haough 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 coxo)ntotg h1eg;zxf9t;sbl q8 j,(2)e: x3ml fnnected to a 120-V ac power supply. What is the power dissipated in the renxols t ofxg1; zet tgbq 8:92) ;)mle(j3h,xfsistor?

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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 resistor isk jr 1gv 11rpf6x,slp( $I = 0.80 \sin (240 t)$. 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 ay 9jq j*0s4inn 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W zpfgm.ief2g) lyn ((:ux +tjlip i)/mo/*n)m resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60 H(xckrs2r ps6p 0bxb2z3 /oz6pz?

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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 reacta-hnnviz0ml)r w; +*qe nce of a 2.50-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-*vkfx f0 79vafmH 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 157 W of inductive reactanc;: 6v yo4u1 nw*s4bktrehn,bse 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 ofn8 t/q8dsof8g 20 kHz is applie 8nqostgd/88fd 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 throukqwpvg n)t ab/do40s63:2v , b9keh xsgh 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 reactance of a 4.7-mF capacitor v,3 z (pqxu59:wod9frrdd3tet-won+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 ogzd pz0-35xjsq-lyj - f 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 10-mF capacitor have a reaol)xm7u;lj fw(q11a n9bky f/ ctance 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-mv )s9uu:x; we63ts ancF capacitor be 100 W?96u )3 sseaxc;wv:t nu

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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 0.00108m8 azb 2jsx7q-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 resistb.nr6 ka+ yx+7now;xvtfew1-ance, 15.0 W inductive reactance, and 10.0 W capacitivefxnroxtb6.e+ w+ka wy ;v-71n reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, ankt7 ,0k3 4 r1*vdi sbwbx*uejyd 1.0-mF capacitor1d7 kv ws3 x4eb*rtu,yij b*k0 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 Hz if a 100-W resistor, 20xel d(fwej/ ;0-mH coil, and 1.0-mF capacix/ejw d;fle(0 tor 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 3u-o3puzsc2,w* 3,(juo6 +;qw gqtc ng edk acis connected in series with a 20-mH inductor, what is the impedance at 100q ,tpcuca 3qdjes+zo2g ;*3no(3uw, wgc6u k- 0 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 is t8(h )htbj8asmg vhl9 h6f 77lzhe phase angle at 1000 H9m7(hfhsh88 )v7gbha lj6 tlz z?

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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 with a 20-mH coil and y3h/x(cjkntccm 7yb) 85x yq40 5zlum 1.0-mF capacitzub5c3tq5h()47y8lxjnc0m/c kyy mxor for a total 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 following capacitancegdl au24 5:,y2z-jk npohcgom mcd rp9d43:(t s is needed in series with a 100-W resistor and 15-mH coil to get a total impedp:da22 4 cupdn 3(m:m yglzgj5oct- ,r9h4ok dance 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 inductor at 5000 Hz for a told;a skljt7; 1tal impedance of 40000 W?l; s;ld1 kjt7a

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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 rej x g*c33.p/k.h9 nxrbb+h jscsistor at 1.0-MHz for a total impedance of 150ck b g.h3* x9s jc.xb3/+nhrjp 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 ia rn4,hw 7agu;ryjky-; 5vyk2d-du 1a 20-mF capacitor. What is the impedance at 1000 Hzjd-7kv5an yg riu,;yr;4wuh 2y-akd1 ?

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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 1,p.t,h*czsdvt 6 k:n ws./jq q0-mF capacitor at 1.0 kHz for a total impedance of 4,vkq t,/ q.c.h wtndzs :*sjp65 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 capacio ub ;4-ut0gymtor at 1.0 kHz for a phase angle oo t;y-ubm4 0ugf $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is ntihr.k :nmb2 ct.3r3e)9snh b g m-h+teeded in series with a 30-W resistor at 1.0 kHz for a total impedance of 33rr.hth)sbn-b ei.mm k+tchtn2 g9 :45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is tar(hi y7f;07bouj z npb-at:4l /0c2+pulta t he phaj4r0a /pt iblh(tz;2yu:c f0a-7oap 7b lntu+ se 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 f otj8os7fct1:batj1+t .+,lewdax7 a 100-W resistor, 20-mH coil, and 1.0-mF cap.,x 1o 17tabj+ jald+osw7fe8 ftct:tacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 18d- hevxor:7 s0.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circui8 dehors: vx-7t?

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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 reactance 30 W, tj)*4lkw tm7bu7 ew8 bh*lf7l9,rcfe and an inductor of inductive reactance 30 W are connected inwlm,c*7ulb* rjb7lfe 8f4k7 he 9tw)t 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 containinghehb . 8z(xxk2:c1mll;vf o ej4 77ffm a 50-W resistor, a 10-mF capacitor,47 hz2fvmcex ex 7lj8m bhlf;fk.o 1:( 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 2f; il3ra cx-,tz na1owith a 500-W resistor for a phase angle o cfl3 a2za,n1;o-ir txf $40^{\circ}$ 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. )s /jkc1zx 9mi/z8l whAt what frequency should the circuit be c)k81 j/s/zhw lmxzi9driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15.0 wgo2 6213(eo aitvrfj W induc212tojvi3(gewf ao6 r tive reactance, and 10.0 W capacitive 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 ci w/2i9jtod8w qrcuit 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 rm p,h+jqb zr:4ch0y )cesistance of 30 W. What is the pphc, mz +r)jh4qby0:c ower 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 5ig ( 0p6n()hzxo +ywjf0-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whenf 0(wx (zi6y n+)gpohj 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 serieso c8;e3o5j,lttx98 nqib xaz- ?aq9ltbjz, 8o-tex c;8o 5 xni3

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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 6+qnyeqn9x:(s o :k 2tb(fqwb4.7-mF capacitor for a resonant frequency of byno sbxq w(nqe: +f9k 26tq:(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 ri 2e:e nky3y,lesonant frequency of 100yly in23k :,ee0 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 rescbyeu36w7j o um2s9k;a x ;bzslr/,6fistor and a 40-mH coil if the resony beus9kj2of7;c,bls3 6/ 6 rxu w;amzant frequency of the circuit is to be 1000 Hz?

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