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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 magj8+w gms4v1f vnetic 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 indu*iuj.lgqm( c 53vhj 0wction states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire inkzt: c.nibvko:2g gj/;(; dln a coil produces what kind of change on the ind::iggckl ;2;b z otvnd n/.k(juced $emf$, 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 mags(ntoj4p yo h8 *pe 48pb/+gtqnetic field through a loop of wire produces what kind o yt* 8bjtehp48n4(p+q oso g/pf 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 :z,kp e tiyh(0produces what kind of change on the indu t (zk,pyhe0i: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 removed from a magneticug1,4id1peuy is+6d 3gh fu q- 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 conductor wilyqt5;hmh3wt j, np; 1r 6j+jvsl be that which tends to produce which of the fol5jshrh,t ;+p1 jw6tjv;n3 ymqlowing 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. w8db*nnf0 1 uo A bar magnet is held above its center with its north pole pointing down. The stationary magnfndon*1bu 0w 8et 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 ba -vim m,g:+kdzg: fn6rr magnet is held above its center with its north pole pointing down, and,g nrgi:m:k vm6+-dzf released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table tbj fy;m1bg3ear 8nq,e;/elw 7op in a region where the magnetic field vector points straight up. The magnetic field vanise/wb; 387a be;gjmrf 1ny lqe,hes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic field vecv4ds w pe4t nj)a3:;pq84z2l j zopwe-tor points straight up. The magnetic field suddenly grows stronger. When viewedjq44sew3ptn:o28de -z l ;paj v4w)zp from 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 r *g,op a*r8 1 jp.b7*i6uzkm5dabfugv egion where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the inducz jbu1af*i *67 8gvr*pp.ka5dmou,bged 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 hofiui(l l9ci11rizontal 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 froml u 1lfii1(9ci 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 wirexvkeitgc wgpcd2; wg*g080 (/ with the north pole entering first. As the north pole enters the wire, the induced current8x0c2;gkvp/wg*g g0 wie(dct 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 constu /7dqp pya2cvm82nk/id0c 3a ant angular speed about an axis whose direction can be varied. kamd2y pcin / 7c 8u3qd/ap2v0In 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 speed about an axis 5t ,swd fpkmhm)(02hm 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 aximt,d2pmh) 05(wfkm sh s 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..v q r0hsv:y;d
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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 thatjdve(pbg4-on t7nh,) 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.j964a,oqv ;nxfie.i4zruuj9 The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward at conv.1 gphy rrjz8i:t t1 fl11b9jstant velocity through a magnetic field that points sth:lyb 1j1rz.vf8 9 g1ittrj1praight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at.l1 qvhl/)a-e ,ajgz5j*p hrm 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 transforr8a/ tq8;/wzmu*uyyi ms

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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. Thfw n,bwm 9;i-/*rlkh ve frequency of th bvm; kh,l-wfr ni/w9*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 ui2r .0 +9qnjwtbn fx yh7w9kd7sed 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 dea ,*wa5 9ujvxx.:5hyog vbr v)vice 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 conta q9yuq*r)vq* qn kua(,ins more loops than the primary coil then it i, rkuy*q(vnq )aq*uq9s 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 cq scsv )(.4z ei0x/nouontains more loops than the secondary coil then it is/nzsvq o4( x0ec) u.si 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 i z0 xm7*kyw.cjnput

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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 ek3(tea-q. fgp 1uus ,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 battery of cot:nob 4 2tq*xht(zbmzxu 5r:quk *9 u8nstant terminat:xhn9zqrutb( u4u 2m*bx o t5z:q*k 8l voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are c k3x/iziyje0j, wv(i3onnected in series to an ideal battery of constant ,w30i/v x kyje(iijz 3terminal voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance l.-6tz ,kmcflL 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 k)(zj5 zdb+).5da5g9lxzv a: q rloxjresistance 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 toy3b5a*ey 9b6v s2pn7m;wy bu h a battery. The time consta* yybs7p 56b bnaueyw mvh3;29nt for 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 series to a battery. Tju i/ wpzep(,t +6a3njhe battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the,zt6j jp e(w3uin+ /pa 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 except:zsr9j,s3 st wlw5n7,:utu . vn

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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 curnud//e h w88z80ekra 7fxjq5rrent

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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 suppl7mdin0 w8hvh- y. In this circuit, the currentdm nwi-h07 8vh

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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 the 3yl2 ufnindwyt*34.(d )a lc+uc7jsk frequency is triplld4nc.ky3d ns yifu2(tl+)wcu 7*ja3 ed?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, th 6ue el9i2x *ooo;7vwbe inductive reactance of that inov weli bo26u;97*exo ductor

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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 approxeiimx;u yn+z(dt ):38c ( tf+xsge3 zaches zero, the inductive3n;zm(gt)isi+x(tez xf +exu8 :yc3d reactance 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 k w43s 9cg0 no0p-uxzipower supply. In this circuit, the currekxnpcg-0u9szo 4 0iw 3nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance5:u)c 5x8lbn c-xum pc in an ac circuit changes by what factor when the frequencx)pc lm5b8c5:xuu-cny 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 zery.pqrqrek+f3/ *z ;a yo, the capacitive reactanceq+ zyr*.k3yr/fp;qae 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 betweenkd;s:c8/ go6j;dkkz hmx0 f8d the voltages of the inductor and capacitor in a RLC se k8h8c mdkdj:z/6;gxosk f; 0dries 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 defined apcjk-cr 5yb3*)sbgcm+mr+ jsmsx8.+ s $\cos M = R/Z$, 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 x5xcop,d2. yq k1 af/jof the circuit increases if R increases.52 .q 1xoj,ypf/adxkc When 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 impedancw4iju *,or7q8k -crtf e of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the cxemq 2q1 ckba5/g)yii0 5 rbf3ircuit 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 capacitjee90p lkaut)jn*/; iap+6 gxance both double in an LRC series circuit, the resonajiklx)e06nja+pt g eu/9a p *;nt frequency 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. egnupkx(0t o8l7v 90w 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 circuiuc zqysa1 k,p,xm-ey 2k/6i,c t 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 tc7u+r *o mpdqb4 ;qo.uniform magnetic field of 0.20 T. Find the qubo+;c.rt*dq4p 7om magnetic flux through the 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+icamo4zqi)g ;n;/m1x ij) q z.10 m is rotating in a uniform magnetic field of 0.20 T. Find t 1;iqz ii+a )g/nj) qm;omxcz4he 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,u4r-3d prd1 1dhg ozh m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are atdrz4 u 1h1,dr-o3gdph 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 adjustablfg1, d th+sn5xe single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil change 1+j;q291h:vck2pin gjbzb lus from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with de n)hygq:j9c+ue n5nb 4(l4u yw9e4 isides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the i4n +ny9ldujn 4 ) (9 yehe4iweucq5b:gnduced $emf$.

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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 tit (kl6x2.c aj, pqx./pzc/klurns 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 a9j5h7rkl3ie 3gc- oatnxz/q3rea $0.20 \; m^{2}$ 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 z7q4vl. y(h9nfa,qcm2ym 4hbspan of 60 m flies horizontally at a location where the down( ,qn4h4zm haq7.yl 9vcfm2 byward component 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 j 6qyxz.y7s,o 1r4w5c p8dgh 0yl6orcnt angular velocity ojdc8yp4so wh7.o5 rgyx 66l ,rz1 y0cqf 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sm35hx7n:fgu +pn6 xlnectional 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 turnsp w;j7p tqx3n,jtux )1uf2a8k 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 czx478rcx,i sowge+; armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular 7e +x x rgiow,czc;84sto 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 1fe79 tyvhjb*7j/, n8u-a mb iw00 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 simple AC generator with an ou4g rq-qqu qi os1w3 *:hvf/b3stput of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If tg-v1 3h* uioqqfs rs4 :3qqw/bhe 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 gejo ng;uhqi w/ mc7-18 kev,n1ynerator with 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 :0z nj m4p o1zpss:)ciof 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 resistanc7ggbj a*x8 ih5e of 6.00 W. The motor operates on 120 V AC, and when running at full spee5g j*ag8 7xhbid it generates 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 pow adbi2(qayp) +mtd9b1er supply. The operatba d2tmq dai+)(19pybing 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 2l gpo0jbrg6j :bi,., o4-V power supply. The operating current is 1 o0b,6g:g,jripb.ljo .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 connected to a 24-V power supply.ev qfbif*- +l2h.;owj The operating current is 1.0 A at full speed. Whalj2ef i+.*; qb -wfovht 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 reduceu95z(b7jx3r yh y 1uw 448e wzi-gjjrd a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the secondnks+i1yfl. -:lw9cnp*rf; +vjc h c /hary. How many turns v*fyh i+cwc1h.k/n 9rc+:- jsln l;pf 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 )uwgb3-argdgzxv ()g2c. 7dmare necessary in a 110-V primary if the 24-V secondary has 100 x w zcd3 bmga7 gr)(g2.u)-vdgturns?

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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-turn secongkwpgrwo/mi ;f6l8 /- dary coil. If the current in the secondary is 3.0 A, what is the current in the pr6g;l ww/-8pfmo r gi/kimary?

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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 transformer. Assuming 100% efficien2cx*sc8qv 6e bcy, how many amps a 8x*se b26ccqvt 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 at 10.0 mA.72x7q6bscl nn The primary coil operates on 1nclb6sn7 q7 x220 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 tuoem m *d(.e7c 5ze/rxurns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primeu c md mx5/ezr*o7.e(ary, 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 primarypow ) y2zt61;yu7s;bq ur, oyk coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is presentwoousu 16;p2 bzrq;ky)yt 7y, 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 9i ilt p0n37tnits secondary has 200 turns. If the input curren97 tlnpt3i0n it at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. nb ./8ib6t mflu6 g:wx-qwbd m6l0t*s If the input voltage to the primary is 100 V, wemdb:t i f8slg./q wb6tul6w0n6 x*bm- 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 transformer has 100 **u0afz /tyqwturns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the sz f*0 taq*wu/yecondary 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 usuallywcf)fpef-g )8/ du uw8 stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in thg)c)ff8 w-d/ wu8pfuee 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 currenth9; b0+zbd- eg0c1i7 um rcbph at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistancebbzdmbrc7uec h- ; g9 1p00h+i 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 vo/i z z-m).9ltuyf) suoltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resisis u/) z9)ozu.y mftl-tance 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 be0vgvab6d:0ssb) b0d1jd1 g50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 deb1 sv:)0gdg j6a bsdb100b vA. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy 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 am0f 03 -jxgeqqi*x e34ebiq3b 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 steppedxxei0 3q3ib fe0-3j bg4qeq*m 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 atoqbt; *y:g)0hpr rvj9 1000 V. How much less power would be lost if the power were transmith9rtpy :;bv) orqj*0 gted 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 aslk/ -.hy-y qh)aqt 4ut 20 A. It 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 origin/h.-suyk haqt4q) l-yal 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. (ebm(6 g3kpqek6l mm;2 4y byx How much energy is stored in the coil'66 my 4bpgb3(xmqek e (2l;myks magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resix1jjkc-tu 451u,y xntstor and an 18-H inductor. What is this circuit's time constant?xn1yujc 5 x,j-tku41t

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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 *fl-2bs of30g f;zmdd+zpy 2m 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 284o fgqr*of*t6 0zkyh bsjljl (0(dcinto a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a iq7w2 gq7ki 1y120-V AC outlet. What is the resistance of the lamgk7 7qq i1i2ywp?

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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 peamf0w0rkl,,8m;jlk 0w )gv ppj k current througp0m rl fm,v,j0j)gk ;0kp8 wlwh 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-Vwz v.w(ek5c4/z;zcm x ac power supply. What is the power dissipated (zzx/.w ccv ;4zkmw5ein the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W retp n4*a/fyjdwj3jh 3 :apkg;:sistor 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 resistor is sljmja, 2+;p:kjur 3s$I = 0.80 \sin (240 t)$. 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 2 o9hqy8dlls1eo n3*k a 50-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 1.0-mH wdw,wldq4g48ta 57mi;l ss) b 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 zhap+v :q45 d,s3sgym of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reacf ca+-1k-s3q - pu6z)hjo ezpctance?

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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 te/ (hk.,fipc 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 4tj.ij ;ncqcj+h.n ,ca 60-mH inductor when 120 V AC at a frequency of 20 kHz is applied to ithq j,jc +n.c. cn4i;tj?

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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 5ps;ev i) ,w/mlj:y2c*pryvtto 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 capacitkkc0qdy 4.* 84fuz8psvr ke)uor 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 reactance at 10 kH/9nt-m+neg 4kcaf9hu*ka hn/ wv/u a(z?

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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 reactancebcry2, -.waha;j)ja i 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 ofky fo;a5 ig s0y:q9it( a 0.010-mF capacitor be 100 W?(ioa yig ;kq fs0:t59y

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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 thro4fln 4 7xylfb*r7t4nlugh a 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 resx7hz hdp li po65)z5b6istance, 15.0 W inductive reactanh p5b6 hz6p5)di7 xolzce, and 10.0 W 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 r 5-*:myi aexxzesistor, 20-mH coil, and 1.0-mF capaz -yx*ax:ei5 mcitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100 7ijzx44v87biwxzgt :d08xtv-W resistor, 20-mH coil, and 1.0-mF capac7dv:x74it 8z4 xwj8 0tzgivbx itor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series n, b-4q(5 e pp)acsbtqwith a 20-mH inductor, what is the impedancep ncba) q5,-q(p tsb4e 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-mH inductor, wgx 4ju5 (thm2.vuodh0 hat is the phase angle ahgvmj txhu(o0du. 4 52t 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mFn/lkt6aarn3 l: w7t dmy/) li7 capacitor for a total impedance of 100 W a wkl37:/l t7/main6rdla ty)n 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 capacita ux*i (6o vhxot4jo:5ydq;mq2 nces is needed in series with a 100-W resistor and 15-mH coil to get a total i hqu*qom5tx(x i4 2d6:oo y;vjmpedance 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 in9yfq445l jb b14 -kjnd+ ynjnvductor at 5000 Hz for a totjq- nv k5j4y1bnlb944nyf d j+al impedance 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-kW resistor at 1.0-s)ec 4bi wf03 j5lf,eiMHz for a total imp i35i0cw4,)lf beefjs edance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor.::ysy1:.nq)pjcn/dxrhe;ia lxb 7 m6 What is the impedaensqa:1)6lr;p .yx b/jh d :nc7 x:myince 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 capacvz52*+ 2aky4i ij ylsrjlx54jitor at 1.0 kHz for a total impedan 4k5zsx+arj25yvi li 4lj*2 yjce 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 needed in series with a 10-mF capacitor at 1.0 kHz fo rj(0x-arw6 cfl*rqdf 6 -u5olr a phase an--6ajr fl6w*qdo 0rluc 5(xfrgle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is nees 9c8l.v5/ afcimo6 rkded in series with a 30-W resistor at 1.0 kHz for a total impedc. 65/k8cil9mrsof vaance 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. What r qg3yhq::m o;-w atq4is the phase angle?qgqt- ay:mq ;w4r:h3o

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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, 20-mH coil, and 1.0ibjqp.dm6,v ivu.io )3 )h5eu-mF capacitor are connected in series? )6ei,phv 3 doq).j i.vibum5u

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF c7lpf, rmbiyhpht9v5y zq u0,d3b386lapacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is t3zyym,3lb d9758hrhp 6,i q0vltp fbu he 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 rx.x+34ado jw capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 63owxda+r xj4 .0-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- p 5dpd5kej3 bbk++hdsistor, a 10-mF c+kb -je5dkpdb d35+phapacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in seriq 5e7k8qy2jyces with a 500-W resistor for a phase angle ofy25cj7qe8 k yq $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 m24xa.g wo 70wnwypk g6F. At what frequency should the circuit be driven in order to have maximum power transferred from tho 2pw6a0wxggk4. nw7y e driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, h2 g 3 : 0ea wpubgi)d*+6 jkixdny:frl0b(l;b15.0 W inductive reactance, and 10.0 W capacitive reactance)6r3y:ebl+fgal ixp bi kbgj:( d;nuh*d2w0 0, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC ci )fr/4p-unmp arcuit 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 ib)6qk*mc yo2j8 sot4 y 4h8aav7gqu-rmpedance of 60 W and a resistance of 30 W. What is the power crqavm *s )4uj h4og b6y2- t887qkoayfactor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W resistor, a hy8rdau i1+ng) q94us10-mF capacitor, and a i8daq1 gnu)u +h9rsy40.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequend:xgd/mp9 k 2bcy of a 1.0-mF capacitor and a 15-mH coil in series?d m2x9kd:g/bp

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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 w2 ue(wf0o2 uosith a 4.7-mF capacitor for a resonant frequency of 10 k uw fu2(eo20soHz?

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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 serfxbnnm3( iqanl v*76/ies with a 3.7-mH inductor for a resonant frequency /fi n7m 6b*vqln3n(ax of 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 resisto/2pjn ky0uisxg 8:d8 rr and a 40-mH coil i8dj/:xykr0pni us g 28f the resonant frequency of the circuit is to be 1000 Hz?

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