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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic fl- (n0axrwsf 2pux 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 the p6ri:aj3(gf s $emf$ 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 produces what kindnt h :-kofufmd0m 9(u, of change on the u t,0(f :9-humd nmofkinduced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire p:2v wb80irmmmif911h lg* eldroduces what kind of0ll8ed 1w f2i* m vh1bri9:mmg change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of cha ;hcdsis q-pkhg-x)2 /nge on the inducedk chsp/;q xgi s2--h)d $emf$, 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 removed5z5 -arbt)l ns 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 an,pve fba2st /m60s.u conductor will be that wm b. ,ansts6/02 pvufehich tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies fla,+dnuhgy 1i-)rrk k g6t on a horizontal table. A bar magnet is held above its center with its north krrk 1),nd+iyg u-h g6pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above itt4t;gm() vu ghl(7 pd-vp ovtax;c2 *rs center with) v-4ota7tg;rpmdu(l*(tvgp;c v x 2h 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 tab fit6:(;5e9n pbla uyqle top in a region where the magnetic field vector points strai:leuqy; 96(ptbi n af5ght up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top ingxidf ab6u5,o.:ki;u/5m m fis1 ,psa 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 current ina/u ,1kmd smfia; :g5u,o p6fxs5ib.i 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 wherewql 61*jh*yze the magnetic field points straight down. The magnetic field disappears suddenly. Wq z hjley16**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 on 1ex*c na8qoxttk1 b7 sq* s1.xj:aas-a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on xjstaa**bx1s ea qo-1tc7qk.1x:n8sthe 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 wi(vxic*ien, a0m soc99re with the north pole entering first. As the north pole enters the wire, is9ci0 ,xv( n*9camoethe 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 anga7-5t w v(-gtoa gnz5gular 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 of rotationag 7v5zgat-(5-gw ton 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 sp(7h8,2;tnicoy myl l oeed about an axis whose direction can be varied. In a rhy(7 omno2lc8,it;ylegion 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 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. w mjjc)z2)e9a
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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 thafnn4 2bu,lz-f t 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 field.c:t;xi bzoj dpv/6c ef.a (3v; The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction)b/hemr e d4:n2p:w0pluf ) a7w is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potentialp 40:lbmu 7wnphf2/:w)ae rde 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 yhcs,nxz9 8r.m;l-sl at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator 2)8uip u ow3eqqo,v-s6i*foxtransforms

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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 each3)pjbzy:qx. t9wu8 lk second. The frequency of the x:q9 k)jpl.zw8tuyb3 $emf$ 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 dev 9pwa )ev-fcl(ice 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 device thate6 i+ (kh8kelb

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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 m;esb 3rwg f4 mo41kj5loops than the primary coil then it 4kw b3 ;fsme1gmr45oj 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 tzf0b j*)vw zg,han the secondary coil thenz*), 0jzfgb wv 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 inputk8g qf/mm 1p)sh1l+vg

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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 resonaniq 4d-k6mgq/)hbb3i.q snco : t 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 an ideal bap d0ctc;vy me3*b6d ;cttery of constant terminal voltage. At the moment contact is made wc0 6d;dcvy pb;* cmt3eith the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an vknu .) uj*ym4ideal battery of constant terminal voltage. At the moment contact is made with)4k*nmyju u. v the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is cono 3*u-hywf.c u8sbl 8weiwq8ds0y1 v 5nected 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 resistance R iseuo74tp6 +p tq 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 se qe4(w up;edy-8pxql+ ries to a battery. The time constant for the circuit represenpde -(q8 wepq y;l+x4uts the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series tolo dpvewzehk896). m5 a battery. The battery is suddenly removehp5 ekzvmle.) w6o89d d from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units elpg6 p fp3:jpt7t7ex( /7clhaxcept:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connectecq p15xqenh x.ihtrp0i l+/( 0d to an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power hxt ub*rg 1r:n4zm,n /supply. In this circuit, the currenrn:4hbung*xm tz, 1/r t

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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 when trx,l.fe3l4 f ura wn:.he frequency is trif,.. nlx3we4ua r:l rfpled?

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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 inductoryo .tix ++2nts/qj(t16 cmchy is doubled, the inductive reactance of that inductiycnj+motxt t1h + 26y qc./s(or

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor apds0.ak xxu js+* kv6y ;.clc/qproaches zero, the inductive ralu .*c/k c 6v q;+xsyxd.ks0jeactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit7lh;u*mr;uu t0ma c (i, the curre;0; tuuuc i(a*7r mlmhnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when the fr yqq:z/o.yqen1jev8 0equen ne jzq:y.1eq8v0yq o/cy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, tba7.)n vnx0qi/z s:r1 li ;qeq-lzw8vhe capacitive zwqxz1ve/0 nql;.n vr:)lsai78 q -bireactance 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 angb5mzti(+w 6m yle between the voltages of the inductor and capacitor in a RLC seriesm+6 wb ym(5zti 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 definedvxp ) +6lkzbh8 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. f.ah5u3 lp/;zg6 vrgc The impedance of the circuit increases if R increases. When is this statement t zgr56ugchp v3/l.a;frue?

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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. Th v4. g mb4wfnb+oh*ilm3p1 c8fe impedance 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. q +t qj w *x7zi o;prf1sp1r,0dlsf-uej;mk87 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 capacitance both double in an 3bl*dpb f2q-ga,w *dxn/hz o-LRC series circuit, the resonant fre2q-pfl**, dbbgxnz wo -dh/a 3quency 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 appli 4 jp:1ibk3claed 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 Rieq rz 6ni(m *suha,u hkr/* loom,/;s.,x3efLC circuit 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 ms bf5pkrtthxpamsw.x ::/i 1f i(0.-wagnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the looiaf :rxwfh. p(i1 wk-/sp.m0s bx5tt:p 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 magne7o8nvn : ovm4ttic field of 0.20 T. Find the magnetic flux through the loop when the plane of the l4nv8 v oto:mn7oop 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 rotating in a uniform magnetic field o.4v7/ycpizsk;ku3q 6ghv t* q f 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vectoryz.cq7 6ku;4 hkvsv3 *ti/gqp 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 sinljc/e8 f.8j plgle 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 changes from 2+xh+bz il65 6jxe9c,mjyzccdj 27n u$4.0 \times 10^{-5} \; Wb$ 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 cmeqfx z p;w)-8chv):qrfw/r;r. 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, fi;ev:wrr)/h- f)r8cp;fw xzqq nd 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 t*k+ad) x.t yyuurns 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 aqsfck eplz8h78 o hb50v.)ms5 rea $0.20 \; m^{2}$ 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 flkiv99 wovdhx z/3 g,s3a 0ybm8ies horizontally at a location where the downward component of the Eartv9 a 3gi90bzyx8dsv/h3kw ,o mh'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 tt79rcchikam/ xw0 :1qur))pis 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axwu )mq0/:t7a9xp 1r hc) kcirtis 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 of+ / -3r/vz :vwsvp:iykbf4sy5. wqhgf $0.25 \; m^{2}$. 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 g1v7 cbla6 7yv.joxlj/3ge/u 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 rectangf( ,38,oxd e*/ ojo r4qum(xetjoz,ufular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axi,,483t ,mxx /ooz(eejfq uo(f d jru*os 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 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 100ttr1zhlq-ov8uavl9ql5/ z/(pguj , + turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a si .i0qwe :i 4xm8olq 7zjszq*(5kkrbr*mple AC generator with an output of 12 V maximum when rotat r(7q.*8kjiol:0sqibm4e zzr 5kq*xwed 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 with a mt+;+ g),;vkb zd uep:murjm: gaximum $emf$ 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 resic5-2sd wdk*6y ac41q gxz rdx;stance 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 r9.wv ;gfzd 631loe abqesistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it gen.le6v1bq g fza93dw o;erates 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 Wc18 lr).t rd+dj(galyzo ,6f3korf p/ is connected to a 24-V power supply. The op6j)ff1dr/toko,3 cr+.p ( ry8zdlla gerating current is 1.0 A. 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 connected to a 24-V pow )jh bxmz-0fb79,f(vq /phy +lysfl.per supply. The operating currj./,mby yzl)fp sq 7(xb-f h0hpv +l9fent is 1.0 A at full speed. 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 resistance 6.0 W is connectedgje9rt72i 7 .u2df4/ avy ,gvjh4jlte to a 24-V power supply. The operating current is 1.0 A at full speed. Whath/ 7 2dyg,r2i.fag tjj44j vetv97eul 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 v myqq /xbl*v-9oltage 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 priie9 g9w9o7j .gl ha)y5s9bqbwmary of a transformer causes 14 A to flow in the secondary. How ma79bw.b9jql w99sa5 goi) hygeny 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 ark;h*9tv9jrsg cf3vk3 oi0w+re necessary in a 110-V primary if the 24-V secondary has 1009vh;0f93r rotwgk+c iv ks3* j 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 x)c mh4 s3e7gna 2000-turn secondary coil. If the current in the secondary is 3.0 A, x nm s3cgh7)4ewhat 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 pr yaaxr89smg-:dpd 8 ucv+(ix(imary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the si ua-pa9 dmx y8(v+r:dx(cs8gecondary?

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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 nkd5ib/b7vk 6+vr k 2 e(*2sjkgtb s3hxeon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary drkisev2b /dvgk 7j6rtks* b5 x2+kb3(h aw?

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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 it3lhbrb (svkqajr, ,8.s primary coil and 300 turns on its secondary coil. sl.k( 8 bhaj3v,,rr qb 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 primarv ccam* 1tdkcv09,04i5 eh c)lgyx2lf y coil and 300 turns on its secondary coil. If 120 V at ,c4ictylfxv 1ack0e52g ch v) dl9m*02.0 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 tdr iw:-s(nywdnr)xh)z7a 9c0 urns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the o-r):i( zcw hy0nxwd )r7n9dasutput 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 secondary has 200 turns. If o0,5fthifmd 5m y0 o1 a;;u:mg6o wgmnthe input voltage ; ;ngfoy5d06hfa mowogm0, u5mim: 1tto the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transfs /h y6l77)z*6 qhui bbhnzvh /r1s3ugormer has 100 turns and its secondary has 200 turns. If l y7bsvr/h6un3z/ bq1is hg)7hh u*z6the power 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 uv. n-(0p-k.qc0rzmr0 na0+y cwg:xgkck- ec xsually stepped up to 4500 V by a-0 kmw(k c0vk0xe:r cy.. ga-rpg zn0c-+xnqc transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 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 1p.v;o3i j- s1ml1rjza:on3k 1jvk z, x20 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line.:kj;lop1n3j x vsmok 1 3v-zj1ai,zr 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 i6c6zh/yg pul )4h otfrz kb+2,s 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 transmission line if the v ,h4gkrhp)z o6t z6cfl/2yb+u oltage 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 toh-/kr r+wa,yi . eaj2etal resistance of 0.60 W. A generator produces 100 V at 70 A. In+ej 2w,. h/kirae-yar order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy 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. vl:9k28brb gqe+2 nzgA generator produces 100 V at 70 A. In order +z:kn8gr2 elbvg 9 q2bto 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-W line at 1000 V. How much less power would b/:qrw+l(iv94ar oh nw 9e rn-4w,pc rke lost if the power were transmitted at 3000 V instead of at9,rhl+9weoni pwr ( q-/ak :4vrrwc4n 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 uii ud r-,2f-w c b8sj 9jk,0ul4po1hqis 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 io4r 1uidkfj2 wlhqsu,0 - p b-ujic8,9n transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in the coilg -bj2li ddgu:(z8bb ,'s magnetic fblu bg 28dgidjb-(, z:ield?

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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 6.0-1gzsz6 z)2p r .8sgkyuW resistor and an 18-H inductor. What is this circuit's timpzz g1yr)g6kuz 2s8s. e constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 9lr v ;j e6 e/w2-7iytdfu:rab3k1do6kyg e.l120 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 cre y91:k v gc2r9ugh)nurrent?

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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 the resistance of the lb+w+ 9enr85tg0ngwkq h5vmp: amp?0wgn9: rhw+p kbvn5+ m 85gteq

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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. Wh fg8zv+-wi ju*at is the peak current i-zwg*+vj 8 futhrough 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 l9 7, jiz/hifethe power dissipated in the 9ihjf,i l7ze/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 resil 8 )gegyk2/fmstor 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 5mb 8d735.;kyldt vps e0-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,ch7csbgv/j+ u bep+2-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.fj/ ugvi+,i( 5;ky ybm0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH co.lk sfe.;2p s2bdxrc*r3/ dqkil 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-mH coil have 14.0 W of inductive 0v 8+ux8bi besreactance?

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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 indui8p+x,wh i ++ lt)d k ac;fxts*w1cf/xctive 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 frequy 4phzo)r2t0j ency of 20 kHz is ayoj)24rzp t0h pplied 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 tf09(n+ 1ltguk54luu cl(aie dhrough 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 capayw101svfl,2 ( b ,eidndq7dhocitor 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 o9 t+*pc5jtxd *kzxr- zf 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 re xtcl5p0vq8s ;0zf+ 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 reactance of a 0.010-mF capacitor be 10:h(*o;)mrf 4 oznqh 1a5/oah kvw6o fr0 W?o5a6;o oz4hwm1ra : */h)orfn vfq(kh

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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 av5+;es( tlqc*jq :qs, /tr lgxd03 fud 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0 W indzyrm;)r)9 ajk8d0hkxe wmo : ex2)p/suctive reactance, and 10.0 W capacitive reactanc9m oe a)pd x:0ykkew8mrh /)xj )r;z2se?

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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 resis y69o,rye)yd/qd (wnitor, 20-mH coil, and 1.0-mF capacitor are connected in9dw6i(/ yyorq y )ed,n 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 resist-i *n h wy7q0iamtz4w;or, 20-mH coil, and 1.0-mF capacitor areyq40 n;iwmw-t h7a iz* 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 connected in series with a 20raze 6gko 43ms r5ur,h:m :wa7-mH inductor, what is the impeda m: kumr:rgwe7rs34, oa6z5h ance 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 resistorrom6cnjy33o*;xuer . is connected in series with a 20-mH inductor, what is the phase a u* jrnrmc3x3eoo ;.y6ngle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a:-a.ti n. ohee series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W aohe.:nae t-i. t 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a q 3 ovpcj1o6,s n,9jks100-W resistor and 15-mH coil to get a total impedance of 110 Wk39 j 1,qn6vojsps,oc 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 0lq 2a2 fibort6wnd1 +5000 Hz for a total imi+2d6rwa l tfobq 1n20pedance 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 pu.yfq0w* glwup.a0u t: t in series with a 100-kW resistor at 1.0-MHz for a totau.0wap wfuq.g0t*y l:l impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a e eu3yw; xbh.1g2s:ea gq, n6( ot.mko20-mF capacitor. What is the impedance at 1000 Hz?bmot;eyn a6 1 g.,.3oeeg2k(u:hws qx

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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 b/*ac /:uogbhy z++wy gso1-iseries with a 10-mF capacitor at 1.0 kHz for a total impedan :a g+zsbohciu+w y/1*-ob/ygce 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 needeo2, ree fv-ma/ql /2hcd in series with a 10-mF capacitor at 1.0 kHz for a phase angle of mcef,/-ev rl2ao h2/q$40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is n5l3mfd awrw 88pu)ftf,(qe s7eeded in series with a 30-W resistor at 1.0 kHz for a totalu(t5 s aw8ffrpwe)7m83lqd,f impedance 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.nkl zj(y9h(q. What is the phase ang(ql.yhk( znj 9le?

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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,f+w 8 opp-i1fz 20-mH coil, and 1.0-mF capacito8f fowz1 -p+ipr 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 +nhr7wme *.aw, 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 the rms current in the cianh*w wm 7.er+rcuit?

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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 r)j,yqmq 5 itv7eactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flowv,m qjyt5 )7iqs 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 f8jf(2joy f p3wor a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45 jfp2ow83y jf(-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor fob p:r4ycqm.c-r a phase angle of .4ycm- rbpqc: $40^{\circ}$ 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 ha,xs,tjfvpodr 5+ li1,n3ces 3 s R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to havexpcs1r 35l ido +f,j,e,vns3t 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.bri+z(rrjl*a4 a 76jj 0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is conb7a6rl (ajr+4r* zijj nected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit isz*uoplzja jpv )jo2)l* (mi35 $63^{\circ}$. 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 resistance of 3wt 5y/hc;x m6y0 W. What is the powerwyht 6ycm/ ;x5 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,e s/b9bcmshis8ydlu(ys :b,4xv f- f6hc6+b containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?4(/y,8 b6fcc+9v,6hbb d -ssmsselbxuify:h

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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 cc ;a.a4noim+vl(c7ooapacitor and a 15-mH coil in series?( i.cov+7 lac naoo;m4

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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 i.8xb*wgra8;nhfqa qze: p2y 5n series with a 4.7-mF capacitor for a resonant frequency oa e* an8ypq2:xr8hwbqgz;f 5.f 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 ir:sury e4+9g m yg7tq-n+cb5needed in series with a 3.7-mH inductor for a resonant frequency o9 r4+iyrys 5n c-t+bgm7eq g:uf 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resu o)j- qke91xiistor and a 40-mH coil if the reso-j k)q9eiou1x nant frequency of the circuit is to be 1000 Hz?

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