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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 unshd*: nsx4xd ,its 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 stateht ,et8k:k +qfs 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 *6ms/r jlh+ ptof loops of wire in a coil produces what kind of change on the ir hjlt+6 p/sm*nduced $emf$, 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 ofh ws0zr3q83hg)i(wx6sn na/i wire produces what kind of wihn/ rsxsz 0gn qhi)(3683awchange 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 kind of change on t7ujv * h9tm6mshe induce9 vmm67*tsjhud $emf$, 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 removedw l3mxf3pu:w o(a0i9y 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 direction of an indsg .0gzfd79rxuced current in a conductor will be that which tends to produce 0g9sxgz7rd .f 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. 5xg/frq. rzsw /wki 4/ A bar magnet is held above its center with its nortfg ww 4rk/zqsi/r5./x h 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 ikj/. jkwbr/qz7t ,pz .s held above its center with its north pole pointing down, and released. As it approaches the coil, the prb/ /, jj .twz7zk.kqfalling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector poirjf 5c28zmfeho ;j41m nts straight up. The4c j rfz5281fj mh;eom 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 fl zm2q0w ovp8:ield vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the directoz28lm:qwv 0 pion 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 horizontaywz7.i7 ox y,0 tg.d2s.vtdye l table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above,dy77it0tx.yd.evso 2y. z,gw what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table7m0 qqf.hkwf 0h0si h(4 tuem9w7l7oe and carries an ever-increasing c if 7ts mlw4ume.079hhwkq(o 0e hfq07urrent northward. Two coils of wire lie flat on the table, 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 e)hy9 jve:t4 n0qort 9kntering first. As the north p)k0hqn tre9t4vjy: 9oole 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 ht zhn +o:l)r8speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orient:hl8hzr )n+ otation 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 (*/8othoa 9j7f xwui yangular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis/ *o78f(yhuiawoj 9tx 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. 6mxx(34tmlg v0het)gh 2)fqe
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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 thaon :xd 25(r ch:lrwy0uc w9ox1t 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 mn3c/5ai2 v .pollzj0; r6zi ikagnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-w xvb mm8jp,fd4*8z q.x;me, oqest direction) is moved northward at constant velocity through a magnetic f qz .,jo*fbqpx 8,x8;4vmmdemield 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 bl 4;dcmkk25xbuar r ;5ar rotates 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 generatorq4j :edc,8wp j transforms

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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 thvr7- vk59-pw5eh ctterough 60 revolutions each second. The frequency of the tv-pvt75e9h 5- ew rkc$emf$ 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 u6g jb.v3+yfr ic7q5ug; u(x ansed 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 dndo-:h 8,,r j;.a6cjwjka l hdevice 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 contal)9 irrs. mx-vins more loops than the primary coil then .lrrx9 m)i vs-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 pfjt7kycv p(x:;a8w;q rimary coil contains more loops than the secondary coil then it is y kva ctx78f q:;wj(p;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 powetdv* 48 k8wxknyz-q5dr 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 resonant1j .w b)kauu7a 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 inductor are connected in series to an1 4sr0umw ,3 zyf7nmqp ideal battery of constant terminal voltage. At the moment cont su0p1q3mmwrnf4 ,z y7act is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in seriestnqi2 povf3fq 8rp,yd:up0 ; 9 to an ideal battery of constant terminal voltage. At the moment contact is i:0q;fuq8 3p2rtvy, fo9 pn pdmade 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 in c6j3tep m99 f;0r2- 5rvmak3ckej wagductance 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 resistan y4czurx( afc*q7/.wkce 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. The ti z 3lhartwz+h/0*bg/y me constant forzh*r ahyt/0l gbz/+3w the 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;wgna8 -3nd0zqfz) mn series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required fof)zan3mqzg -0;dn 8nw r 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 following5z9c aq9mjp0 t 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 cur ga 3iks8 m 0-kd7mpcosh:/sf khm;v6:rent

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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 conn746bijcztw9 ,kwc4k h :7n8rnua5 uzvected to an AC power supply. In this circuit, the current:tcnk 8w9b546izczw4rv7n ,aj7 uhu k

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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 b4ci(fo,chb) uy what factor when the frequency is tri4uc ),cf iob(hpled?

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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 A17kiawrtp1 3 zrf:j) fC voltage across an inductor is doubled, the inductive rpk)iz:fa rf w7131trj eactance 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 ga8rhb95jkd0 q mz+y2) oi3vpzero, the inductive reactance kjb3zgq 0+5mayd82phr9v o)i 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 con0 e7i/ f. d1+yh1s5rjecxqsa rnected to an AC power supply. In this circuit, the curreae0 q7ih5d+.sr yjf1e1xr /c snt

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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 cir fj 6bh4dtsu.2zh1 kb4cuit changes by what factor when the frequency is24 uktfz 1bhbh4.d6 sj 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 8sr 7uiosa0f8 approaches zero, the capacitive reau8fsr08io s a7ctance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacit .xlpffdp (6lcok1;w1/jdsx/ or in a RLC series /l fdpd 16cp/xj1sf(l.w x;ok 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 circvaz0t 9u-l(m*1o9etd nw;jwl e b:ht +uit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if+ c3me-8zx u;tdher n0 R increases. Whz3x8m-e 0c;ud+et nr hen is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of 9txcxz2e)m7arljz7 / +p2mkhhap 5 j 1the 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 circuiha 67ahu;s td) dqy7d;t. The impedance of the 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 0w gvhv): lyo.cg yd4(rbv7f 0the capacitance both double in an LRC series circuit, the resonant frequency o o.gybr wh4cf v:0l)dyvg7(0 vf that 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 driven by an AC appliveff90(goxdt q ,5j* t0jhq*oed 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 ov;1 (: znzr;2owzcbyy ccurs 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 rotatqtnpr,hln; w 9 5z-2gls6red)ing in a uniform magnetic field of 0.20 T. Find the magnetic flux through th,s5l9n);zet2 nd-glp6 wrqh r e loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fiewps ))jzn 7rb-)t3i esvz0w-x ld of 0.20 T.zvp wzj e0--3))wns)s 7rx tbi Find the magnetic 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 m is rotyxh d7+l5t;jkwab n:4ating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnen j+hlb7a4y;5xw :tkdtic 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 lol gqyht*t+7dq)u g8s0op 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 changes fromn02sygj3; d5r +9,mey s .2q e,rlpts-ovbdko $4.0 \times 10^{-5} \; Wb$ 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 cwi4/ra, *y;. kxsygf-d vyax4z4gik 3m. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find th4igay yax k3yk4*-gxv/4 f.r,z;di wse 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 turt 1i:qh7r02.byi 5 jh/ p/dr cpjjd: v/-nstkzns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area(p6anafl-;v* oxcnb2pm 90c(pu4(n rg x0w vt $0.20 \; m^{2}$ 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 p cp;x90z lbt/i+yt q8m flies horizontally at a location where the downward component9 p+z/;txlcy0i 8ptqb of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a consta z8iaj-rk;gm8 nt angular velocity of 2.0 im8k-grj az; 8rad/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area u:w +ku, 3-hmvpsbg6rof $0.25 \; m^{2}$. 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 consistr*mpht0(sl ;m7 u-p pcvnuw( -s 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 $emf$.

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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. Eaczat4 b7nzck 0 a4ccyn-kj9d)8h loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rjaz0 9dzck ) 7k8tbna-4 nccy4otation, 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 of 100 turns of wire of aredrw+cr cp;;0b 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 construct a simple AC generator with an outppp 1kulo14wu7ut of 12 V maximum when rotated at 60 Hz. A magnetic f1k 4puo7pwlu1 ield 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 with0+g(xbnk zdl4gb 4wn( 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 -evf lf dfvaj:/+ a5-ehave 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 have a resist kjd,gd o w0,-/7bkfli 68ulbaance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it geld7bdkio/ -,k6 bul 80wga ,jfnerates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power s d2 jnh4a8uy6ipy 4q8wupply. The operating current is 1.0 A. What is the start-up 44pawdiyuh 2 yj6 n88qcurrent?

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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 mca hagqw.,1;( v.(+kpfqeny46kq8 aia u wq(is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back qa m ayuh+8c.pawfqnq(ek(46,w(;1 vqa k.gi$emf$ 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 8efb cpe x*;ew2gf)rvt0d q,: 6.0 W is connected to a 24-V power supply. The operating currentfdeeq,8 :bp;c2gv ) *xe0twfr is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltage lu 6ym-(tyz*dof $120 \; V$ 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 flow ie( dyd5/kr;bin the secondary. How many turns are in the secon(b;rd/ yi5 keddary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, ho6+zlbbm-mg6o p z)/: w /iyozkw many turns are necessary in a 110-V primary if the 24-V secgmmo6k/w/-o lzb z): z+i6ypbondary 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 consistf4-4 q swexbuxxv0 ,e *79xmcis of a 500-turn primary coil and a 2000-turn secondary coil.i* qw xfmb0 4vc4ex-s9e7x u,x If the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transfnk(* gq. er62njxz9tr,j 2dxxormer. Assuming 100% efficiency, how many amps at2x., d9zj x kn2rt6xg(rjqe* n 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 V atbf6+rp vgd0bp,rdry *hsf -qb7( 3-z x 10.0 mA. The primary coil operates on 120 V. What doesbyr7f-3r r x6zd0sbb( p*+ghp - fvqd, the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on i: i57j1vp 7wyt.rrf qx47u nxxts secondary coil. If 120 V at 2.0 Aiyvr.r :njt57f1u 7wxxq7 x4p 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 coil and 300 turns onobq )b7fv /(0bzuxc v2 its secondary coil. v/obv qf(cxb u z0)b72If 120 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 22jxf,md4r +)o4cvn kd 00 turns. If the input current at the primary is 100 A, we can expect the output current at the secondary to ,dr m jf)2xv oncd4+k4be

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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 secondary has 200 turns. v2go5 8px 79;w5o k ogodpc4thIf the input voltage to the primary is 100 V, we can expcvo 84dop9 gt75g 5how;op2k xect 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 :re(yvjs9 6 xj2 udqe5secondary has 200 turns. If the power input to the primary is 100 W, we can expect the pow e9jvjey5:rux2q d6s(er output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V,w;oi1r+ *j7jgsd7d tr4/zgjg iuu-o. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of tott ggj1*o/- owjg;r+7 ududj,i 7 4zsrial resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A * n.birazso33gec1s 4 of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a s* ina43gc3 1.ez rosbpower 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 120 V. The voltage is usuallygom)yti(8uw0,opwku+ 2hxk 3) y 4r ue stepped up +ker)tixy8k4o 2 0h uoupm3( ,)wwuygto 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 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 t u9sm5j.t qgf2otal resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of g9 .uqjmsf2t5 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 haob;0 ;h a3(lbjxpa:j qs 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 percenbqpa0l;j( :b h3 x;jaotage 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 be d4z 0n.0bchd2m; bba glost if the power were transmitted at 3000 V insteadn0;h.bgcbad 0z2m 4bd of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It5ajcv-zyf edl,kv :o: p;3xi:q+ 4qbu is to be transmitted on a line with resistance 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 origi5fx :dlkaqu qv:p4-,:z jby;+vco3ei nal 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 eneyiq( dq 33qzxbv04hg ebqm:25rgy is stored in the coil's magneeqx( v0gmd b24qbz q3i3 h:y5qtic 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 containnzc4e36 c gutxhfn,0 .s a 6.0-W resistor and an 18-H inductor. What is this circuit's time con x6 cfnet.4u30nhcgz, stant?

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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 ACg3okwa;b 8k g- 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. What is the peak cuo+ol x fwb2t0.rrent?

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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 is th5s( . j0o3j;fry xkqkylcz/u)e resistance of the lalokc/ysfj 3; x)ky0 qr(zuj5 .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 dg/qw4hbdwb kfilb29,b59 *xpeak current lb5gw9dx kb24i/dq 9bbw, hf*through 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 connected to a 120-V ac power supply. What is th(ln le r21z/x)w+ffyfl; e+q8lj vqv+e power dissipated in thlylnqfzvql+fe;(2 lw 1ve)r8+ j/+fx e 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 rezkl 9 of/v j01h7,wcjesistor 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 resist)fqpv:gd+p: jor 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 resistmmi g(++we 7zgsiz2(-l. f*o suml4avor 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 6z 55ybqoqzyfp1. : x:i0 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 10ttokyyf7r.o( 4+mp7 mw:dp6t00 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactan g9wdka0cek* /ce?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 100wo t8 8.qmq)jn0 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 1,kqwh1sx3 e: z20 V AC at a frequency of 20 kHz is appli,hek z q3w:s1xed 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 toswgk9fri30v,zn )z9 d 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 am q+1g ndb58p4am7(rkv mn3wmu c;;nmt 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 cj dpq5fq4,3vln/kq -tapacitive 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 ai/ h hp mygkl::ctob. 0w(vy70 10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive qgezczph.wwlz k47 (t4u)z 42reactance of a 0.010-mF capacitor be 100 W?)7ewk4l g4.(2 pwhzc4zuzztq

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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.j3au6j2qbyay;dd5qzl m5( d+ 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 usja(3q1k*wa:l / r 2r1e mltcze.v*r12.0 W resistance, 15.0 W inductive reactance, and 10.0 ecvrkulma* rj1s.r(qe a*/ :2tw3 z1lW capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W + 2jkhq+l- qykresistor, 20-mH coil, and 1.0-mF capacitor arelkkqy-++hq2 j 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, andun9 ox 6r 1.y.r woc3,*izfioj 1.0-mF capacitor ar3w zr.o *r6o. xic9junfiy1o,e 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 conn (n jaxs7zho 9 3a..tnhq*aff.ected in series with a 20-mH inductor, what is the impedan9nha7 3th.an s q(zox *jaf..fce at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20((5wew7f+ok r 1ypezg -mH inductor, what is the phase angle at 1000 He 5yfw(7worepk+1g( zz?

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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 2a9rg0pa.o8 hj1oek i in a series circuit with a 20-mH coil and 1.0-mF capacitor foa .aegr9oj ok1hpi280 r 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 capacita:-home 02ixbj n1 j)donces is needed in series with a 100-W resistor and 15-mH coil to get aobixdj-jne2 o:)mh 1 0 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 witfj:-v :wygbd/ h a 450-mH inductor at 5000 Hz for a total impedance o gv-:wf:/j dbyf 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for a t 5pvxj( jb+-)n6sozn3 uj bt/yotal impedance of 1y b)o3jjn/ t6px s+-ju(5bzn v50 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) ent)8r rxpu2zj/b(xt)wbm+0 hm 1wc series with a 20-mF capacitor. What is the impedance z)rmp28t/m)h1xbwetx0+w ) ur bjcn( at 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 f, 8jzjbiv.45s al do31.0 kHz for a total aj zdfijs3bl 5v,48 o.impedance 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 needio:1pu3bx6z:ohwr) /9go ef x ed in series with a 10-mF capacitor at 1.0 kHz for a phase angle ofew )z oob 1:x :ug96pxi3orf/h $40^{\circ}$?

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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 withw tmh7x4(x6b 3ezb.dg a 30-W resistor at 1.0 kHz for a total impeda .e(hzbd m xtg67xb4w3nce 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-mF capacitor at 120 Hz. Wos75tdatx :*g5tm kk.ajnz/l;kr,(z hat is the phase ant5jskz ana *k(m/l;ro: ,.gdz kt57 xtgle?

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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 oy9h+p v8gv-uq)2vqs3i a(4hnp uq:jHz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connas8v(:)uqup vhinq +9- yoq4gp23jv hected 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 consistci0z; i 6zyu e0/ky:fns of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is thc y z6:0z;en0ii u/kyfe 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 capaci y-sr 9e7emd y1kz) oleo0q*z0tor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in seriq9 eozzyky 0-*1soee0d )rl7mes 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 re:. *0m:fz9ps idnoukvsistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz poz i0ufds*o :.9nk:vpm wer 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 resistcpom hk, rn2we;(cv35or for a phase angle ofhr cmev3 c,5p okn(w2; $40^{\circ}$ 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 = ym.dk /);ngaq 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in/gmyn;aq.)k d 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 cn7 he 2aowx -8zay*eb.ircuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is c-ea2 e.7bx 8yw*zn aohonnected 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 a :i+.fcbbtgu 7n AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W a 9+2ngnn sas-znd a resistance of 30 W. What is thegs-s n9+na2z n power 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 serielv 53gt /pssbj-+2kb:9r1 ujg4ti cpcs RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, whp1v3l2bksi4- g5 tujjct9: r s+pgbc /en 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 sr l:bm7dl1 .(cffm1 gieries?.rdf:(lcim gb711 lmf

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a reson ;)paou9,clf,:wx vmzant frequency of 10 kH,mxp,c) zw: auol9f v;z?

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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-ml4/-. hbmkz4 cmcw5nl H inductor for a resonant frequency of 1000 H-lbh k5/n4wc.m 4 clmzz?

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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 pjxn*knv8v48 30-W resistor and a 40-mH coil if the8k*nxpnv v4j8 resonant frequency of the circuit is to be 1000 Hz?

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