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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 r m/zlskq*2r 8fisx.h h w634zare 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 stat7q0zc0io8 t wu/g(kv jes 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 ojp-gzwk) 0(v of wire in a coil produces what kind of change on the in0 o-gwpkv)jz (duced $emf$, 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 loos.qo(yn8ko o mwzwwj4 1/1d8pp of wire produces what kind of change 18nw4 1jq(wpo/kwo zm do.sy 8on 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 produce)omkm(0 v0wjis what kind of change on the indu0im0 (jkovm)w ced $emf$, 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 removedpqu6s(5s4c-ap m )lj g 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 induced current in a conductorbycha5 cccso:ha -59+ jm-fe ) will be that which tends to produce which of the following efo+ y9 -: a5)cmc-5cshf aebhjcfects?

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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 horiznhbw;g.ureb sfr9-4w d-6x a2ontal table. A bar magnet is held above its center with its north pole po-gd.s2 w-6fx ;b ebraru94 hnwinting 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 liesz48j p/0ca 4l-il qeng flat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the 0p 4cjq gn/lz8la4ei- coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic fie22*go jxaf/ rkgd( h9hld vector points straight up. The magnetic field vanishes r2kg ( g*2xfhjoa/hd9suddenly. 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 tdn6; skji:dt,e*jo/.u g c73ipm8qp yhe magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed frcij o ;pt8 gp:6 j,un *ie3/kdd.y7mqsom above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where- x4bv7r*m+ 1 ogz70veqbwnds the magnetic field points straight down. The magnetic fvg w 7zq+sx bdv o1*-mb0ne47rield disappears suddenly. When viewed from above, 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 onsm 0liil5z7c : a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from l 7is5z:lmic0above, 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 thrqu5 xlq t:;b;vh+pq.w ough a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewehp:w ;5qxv.;l qb qu+td 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 a ,gybs.q,-uk hr3wts 3ngular speed about an axis whose direction can begyrhk , ,-w3b3q s.sut varied. In a region where a uniform magnetic field points 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 s.th z--/g: 1ki5yhifg -gqye1v ggwj(peed 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 of rotation if the induciz-:hgge/tv1gw5( h jg.ygfki -y1q-ed $emf$ 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.g;y5 p6 e9 g3w-m9dj5gdaiijp
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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 ampgh .:ez6h)li :6qc.qpv:ep n $emf$ 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 field. Tc, ffri,okc53nnd1ty 1n10y yu+djz oij9 q7;he $emf$ 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 northsmc, ;j- euue:m47qc 3ca5u ohward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential i;jmc , c3q5: em saouue7-cu4hnduced 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 rotate 5 +ujel6u0yvnd86sbos 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 generatog wa;dv c1/o;wy4*mnj r 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 through 60 revolutions each second. The frequeddig17q -e3n ency of the dg-idn1q 3e7 e$emf$ 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 usedh 1- -wx9srby pft,;gj 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 device tha4a, i6mcmzx ygdx ,hv6njzl q8gk7, 8(t

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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 phey c5ge-d+8 trimary coil then it e+5y h-egc 8tdis 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 secondaryo9 :)cpzuz9 ul3my 1gc:4 hada coil theu 3z9zo 4:d h :9ccpagu1)mlyan 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 power in2 az+7vlc8khd put

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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 circuhd0,q03upycryzv*oa 8f9y 3w n1 h7fsit,

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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 ind(z ip5eunm: l:uctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage apuzmn:(l 5 :iecross 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 coph.)2j nuru ne2de5t /nnected in series to an ideal battery of constant terminal voltage. At the moment contact is made witnuee 2h5npt 2jrdu /.)h the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inducta)+;vaudwkv+q.uxp k: 35 lceznce 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 wi;d)p,6qd v u-h q/ vay0d)twxrth inductance 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 in ;bfn38 i vq9mgwj pyw87den2zf+/c- wductor are connected in series to a battery. The time constant for the circuit represents the time required mb jzn9fgw 8 83-fe/w+ wpi2cqynv7d;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 su/7l.w6+yn fg+bqm pheries to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decr/nfp +7bw+hluy.qgm 6ease 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 samerqg1b50g9 ljhsy*, mc uh m3(z 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 currecx5.7t msvb ,hnt

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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 6 w8 tietk57tqmvb./zan AC power supply. In this circuit, the currentv bk6e7qw5 tt/z .8mti

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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 fa j3(fq+9aveha2 orb/:5i zuamctor when the frequency is tripled(r/bqi3j 5eu v9mfa+z2oaa h: ?

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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 voltag;-y)w(r(taq7nv7gda x , owyxsjs.e6 e across an inductor is doubled, the inductive reactance of t7 (6nr-q(y)ad,txyaj.sw7gv sxo ;e what 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 zeou xz06f4x z2kro, the inductive reactance of 4zzuxfo2xk 06that 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 supplyv 6ay+n) er9wp. In this circuit, the currewa+v6 pn 9ey)rnt

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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 7.wwde v x +ou8e0vlb*j:d.vpac circuit changes by what factor when the frequency is tripled?.d e jxp+l8u*.0wvwo :v7bdve

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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 approun4bw f20o) ooaches zero, the capacitive reactan 0 ubfow2o)o4nce 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 capatrr6rexzn hs3.0v4 ae- d ) a8i+(klxmcitor in a RLC series)er v84t0xms lxd3rirz. 6 ha-ea+kn( 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 is define2q du, h 3flbe+oo5h,zd 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 mfxksqk01x24 impedance of the circuit increases if R increases. When is this stat0fmqxs4k12k xement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit incr /itn+. si+kpu 4;ahjreases 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 seriev5 jzx3+oq xb.q96je6 m4htox s circuit. 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 the capacog.zan8q ; ih6itance both double in an LRC series circuit, the resonant frequenc8hao .qgin 6z;y of 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 applied voltage),e) d8z:zzmofng1 va aep5d8 . 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 circ6+fkhi/h rj( xuit 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.vc;;dp *tq4s .es lv*d20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetcdl4ps.vdt v* qs*;e ;ic 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 rot*t -w oaqbd)v*ating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mag-)q*at*o vdb wnetic 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 i/hb bnvwhxkt7n8abz o 4v 9 6*s4um::zs rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop whbb*4tkn8 9zhxvhzb u/a74:s w m6:nvo en the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop ex -jtn1 mv4n: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 frwpd q)ziz: ap,yarrcrr4,03: om $4.0 \times 10^{-5} \; Wb$ 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 5e*: ijjpf( ioa square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T5 i(o pjif:*je 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 turns andg-uz7 4afe /irmbn.h 0 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 an j82 l:ez zyz4y-eqslmcey8+qc a0qv l;q 1y6)d 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 60 m flies horizontally t9p.t egsofl +x;6 d42j+ndfe at a location where the downward component of4g dffn.eot 9 ls6jte++xp 2d; 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 rba 0 n.qh4ueg0)j7fy eotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its endy74.qj0ehu)n ab0 fg es 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 loivxugh qu+1: ba()4 aq ,5kosuops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of.n7 .q tt vd1vn j2c/qoysp0:bf)zc) b 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 gc9tq+haa+d2 pj30d eau pq82loop 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 voltage of this generatore+9p duaq dg 820tahj3paq2c +?

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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 t - onf*4;jg9ql5jyrciurns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an outpsu9op z*nm6l ne-xc7 fhp2v 1:7szj* kut of 12 V mj pe z1-uvk n:hcsxs*f769l p2mno7 z*aximum when rotated at 60 Hz. A magnetic field 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 wdvm . +6pk,dncroi nlwwxr);vb rh-5i.n)c )1 ith 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:oi3snt4rb i 7 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 resistance of 6.00 W. The moto )c2no8 issqreddu0+a w(80 ielu/o*nr operates on 120 V AC, and when running at full speed it geqecs/ws 2on8l daeu0 di )i0 o8*rn(+unerates 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:e 0oez6ntfp; supply. The operating current is 1.0 A. feeo np06t;z:What 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 conn1*eu;x0bo k0w t+ prldected to a 24-V power supply. The operating current is 1.0 A at full speed.rb+;e0dx l*o 0wtukp1 What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistan r9w(sa*m 9anyce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full (ma9wrn*s a9yspeed. 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 transforsha0 )fjz xt /pr6gsxx:;hq 74:;y vwpmer is 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 transformer causes rc360;u5kuhu pnvmnmnp73h 314 A to flow in the secondarm3hp5 rnm 0nuh vnukp3;u6 37cy. How 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 necessary in a 110sluw,a, kd,g3 -V primary if the 24-V secondasa lkd ,u,3wg,ry has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turq.m:e8zzy 9h qn secondary coil. If the current in the.8m 9qeyq:hz z 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 pri2mw))r3b,dx*zlqg37uhn zr x mary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the7)3 xmz*rlu dw qxh32z ,nrb)g 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 provid7gc e(w2vs8w0rasx0i *b y8u8 hz mtz/es 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the smr 0c/te0ixuz8 8g8s7z*hwb( 2ayvw 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 tur, f;15zp8ssrk4s3 kjzzu6nmqzdq81 rns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primajpksks541q38mzqrzu 6, r 18zz ;dsnfry, 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 605mv74g rzgd6 k/lovrfe7/i3 x turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 g6zkm5l7rgir4 3v/7xv/ ed ofA 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 a 9u, myh7kl)xk4d dkh2nd its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the h)h47k kd,my ku9xdl2 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 turyajh+e w bf(pegy ,,k7dj(m6 t-p n7e7ns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary tokp+fw,p b ee 7tdy 7j7(-jemgah(6y n, 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 ha/ .onpbashel xsgf2t+ q9,b2- pp*,bbs 200 turns. If the powertbhf gns eapp/- bs92p+l2qxo.,bb,* input to the primary is 100 W, we can expect the power 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. The voltage is usually steppfj3jfes wt *c8 din/qt01*8pb: c v,yf3mzmo2ed up to 4500 V by a transformer and transmitted through a p cbf,qn8 s3oe y/ pvtiw8*3mm d:1tjc 0jfz*2fower line of total 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 of currjtm7z. m7y7lqa5mcd 4 y;wed (ent 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 percentage power lost in the tran75t;mj ecd7(yd7wq lm a.z4mysmission 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 usuallao x4wwok5y:snkd- 7( y stepped up to 4500 V by a transformer and transmittedy-x 5s4do :on a7k(wkw 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 total resistajsp0vo o1l0tal1y.o ( nce 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 j(ap .l110o sy0lvtooratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. Acgsq/yob7a8bakhxu . a,l.xq;b.g+ * generator produces 100 V at 70 A. In ordeb+8babgoqclk uy,x .7hq*gxa/ a;. s.r to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-Wnm z 0ejx-)2ju3o6 pjc 7e),xuyb2n vf line at 1000 V. How much less power would be lost if the power were transmitt px u,v6)j0n7 eu3cjjzn-2m)eyob2 xfed at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is u3 op9gw . -upfe9rfpo*+m* iato 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 original rau.wug*p93m fp+i o ep9-o*fpower?

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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. Howyi3h8 o6mijx6d5 hrr w9az/*r much energy is stored in the coil's mham ri *rd36o i6y/9hxwz5jr8agnetic 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 containl 1oyqs.*z -)dgmgpz i,p7b1x s a 6.0-W resistor and an 18-H inductor. What is this circuit's time constz7 g*-pm.gd,iq)lx ybps11o zant?

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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 1d,8e lot(, v4zuqno8u3; e6kzy by pz120 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 curr zj+yxqu9z(tmvd9 j(zd 6s1c0 ent?

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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 +km;8 cuaemlq9rp2 )fis the resistance of the la;fm+ k82e9a mlcpqru)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 conndi 0y1av hxmd 2(u(,jcected to a 120-V ac power supply. What is the peak current tcdiyuh xmv02(1 d(aj,hrough 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 the power-fkt -hnpn7z ac7 ;p/q dissipated in th;7fpptaqchnz k-- 7n/ 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 resisf (.:a:vhpxaziq2e -a tor 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 resistfcj43 i6-u:edv2f skmor 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 res+ 1(*z 4c vmfgzgswcswxe77(xistor 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 inducto igq g, u5a5mpu ;x9u:4, bdgs*edqj2fr 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 12 7crk03a9ihpt:t1qkl 9 plq m000 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 dc8w ;,v scvu+j0;xbga 14.0-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.f8cz)bb rn y. 157 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 when 120 V AC at a frequ rr .)hfmkxk au:;ui7n8n s6j6ency of 20 kHz is applied t; mrxa).86k :ji6h7uksun r fno 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 thro n a92d2hpemh+c2kk-axk.6 ty ugh 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 kj*bp a6 3zo4 (bu v(akhjuv ,+*o9ipwa 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 capacitive reacfeit01i2 + z6sgje.jptance 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 reactance oe)m npn )eq 5ozg*x,6wf 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 cap u9zeaeh8wfae0.)kdy-j,0o d6 ;bb znacitive reactance of a 0.010-mF capacitor be 100 W? f0.j d a hb;a6,)9-0ybz8oeezuknwde

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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 cz1mp l g ya-1t* 7.ojzvktx,+tapacitor 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 ut)8 tnnkn+l /ucsw ;6of an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance+ 6t8snl;c )uuktnwn/ ?

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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, 20jl:beg3*rso/t07 c. r jts k4t-mH coil, and 1.0-mF capacitor are connected in se7s ot3 . tcj/et bl0s4g*rj:krries?

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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 1gl )z 7,bo)rlhdojq/o(sv 3+k00-W resistor, 20-mH coil, and 1.0-mF capacitor are connectejgo osohbzq3v7) /d(,rl)l k+d 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 54.jtv mt1gmfwq5 j- uis connected in series with a 20-mH inductor, what is the impedance at 1001t u v5-gq4jw.5fmtmj 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 is0f+5u+eib :vdohff* t connected in series with a 20-mH inductor, what is the phase angle at 1000 e+ob*v5 :0dhti ff uf+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 circt1u2v,m tk /zrwfv1*4nmqg 94jw,o c zuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500z 2mcvugt / ,4mqzr41o kjvf9n*1,wtw 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 in series with a 100-W res kto:bn6ow pk*/5oq4: 1epkhfistor and 15-mH coil to get a total impe foko:h k1o:k 4e 6*w/btp5pqndance 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 indbtqj (tr-(8/csmorc9m 1ivec9i 9*k q uctor at 5000 Hz for a total impedan (ime cvcm/tqcr1s 8q9* k-rj99i(obtce of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100 cgk2 uvsq;*pdb. 5qp*-kW resistor at 1.0-MHz for a total impedance of 150;.qp2u5 gqd*v*s k cpb 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 serien7p jl2;iolsqd4u8x.c8d 27 v rkyl u*s with a 20-mF capacitor. What is the impedance 7d sy8i cv2uqpjl 47u d;.nlk rx8*o2lat 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 1.0 kHz for a totui944auwhk+v4-y-xcn x/ hp aal impe-+ac w4 hvpn4auxh/ uiyk- x49dance 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 need 1m xcmmgrby), *jrq49ed in series with a 10-mF capacitor at 1.0 kHz for a phase angle rj*mmxr4gm1c y,)qb 9of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for a total 8owkk54noob aqo6d+3 impedance of 45 Wk8kd63 oo+ na54wqoo b?

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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. me;8igh5erq 61(xa mtap a;vp)7 ,qum What is the phaa ;hqme(;iart, )gp e 7ma85xv1q6pmuse 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 100-W resistor,e dr4 a1kl, :suxqoe9ll;- et/ 20-mH coil, and 1.0-mF capacitor a/k9e el-:a lq udl,t;41esroxre 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 res j2qky5:ajm ;vistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit ijvqa : y2k5mj;s 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 capacitor of capacitive reacta.e ;:m3bz fz;khyl bsvntm46)nce 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this fzmn) 4 y:;sm6 z;.3tbe lkbhvcircuit?

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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 c.*y 1ec ivvz5mz0uzd/q o-ya ,ontaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H ind*5 -1iavu cze yzm,z.0 vqyo/ductor, 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 wit 8tr q:; vawf*4,th0qcey)rrvy ow/ 9xh a 500-W resistor for a phase angle ofvorae hf)y:qtrw , 890wq/*xy4rtv;c $40^{\circ}$ 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 = 10v55 +-/ w+ydfazib sjsl u+2ly.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving sourvu+b zj+lsyy5w-f 2 d l+isa/5ce?

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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,6 9s)gmz5mhcg -ul4 cbkv+gay8h*p;76rx qah 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is ch+7cg6u6zmh;84xv)ba -cg y5glm9p kqrha* s onnected 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 Ae g/84 5ijbnxiC 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 oz /zxh 2ax::9s-ggwoqf 60 W and a resistance of 30 W. What is the pooas 2z:g-/hzxw 9xg q:wer 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 f58f7. we: y3tlr ni f;lvj*zohor a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hzo: f;5fzl8 j.ihvnw3eytrl 7* 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 frequenc: w3:exk6gwepn )cs, my of a 1.0-mF capacitor and a 15-mH coil in series?k me3ew nxp: ,6cgw):s

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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 resonant frequjybkr8 p54m jf. vfbkyt1l84-c )al7wency of 10 kHz1 k.lt f-l4br7km5f 8) yab8y4jcpvwj?

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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 fabd5pb mj / -0 6o(fsjatnj8k2requency o26 f -jt(oad/mn b0sjjbp 5k8af 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be pq f 7h53bpedf+9 3ptqtlaced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the c hp9dbq fqt3e3t+75fp ircuit is to be 1000 Hz?

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