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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units ofo952 habv .g+5ldg, 7mueqhyf 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 statcl nli0ex2 +,d6 x,ewves 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 in a coil producme9na2cl 7: : zo1yw:-gykteces what kind of change on the induceelc1:-t acgn 9w 2z:myo :7eykd 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 locah5-ei8curo378a owg5 q hg/in4lf2op of wire produces what kind of chan/face57i l-r8wg24 goi c3ouh a8q5nh ge 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 w j)lgv4gf7m d6ire produces what kind of change on the inducd l)6fmv4g7 gjed 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 mjf mvog(s jbf/9g1 wu f(-uu70agnetic 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 eh qn- jjfp e-f9i9);ian induced current in a conductor will be that which tends to produce which ) pn-9hi-e 9j;fefjqiof the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horii4n6-kes-g l hzontal table. A bar magnet is held above its center with its north pole pointing down. The stag4 i-kn6shl-etionary 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 sthp)tm.fr1,15 xbeo a horizontal table. A bar magnet is held above its center with its north pole pointing down, andor1t bh)xf .s etp,1m5 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 q+ b; 8,jxq( aegc:heatop in a region where the magnetic field vector points str x:g,;a8jq( qa hec+ebaight 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 in a region where the magnetic field vec un7- )0vdq9dvca.ea * 3aazsgwad5t(tor points straight up. The magnetic field suddenly grows stronger. When viewed fromud w.a5d) 3dtz s aaecva7(n0qa*g-v9 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 regh9 oehwx8b9r ak3,1 0s5rqdiw ion where the magnetic field points straight down. The ma x03sr8ar5h,oehib1qd99 ww kgnetic field 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 okkn*w ij,82 (6gjii ken a horizontal table and carries an ever-increasing current northward. Twonj ie gk,6 iiw2(*j8kk coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls throug1loa cr:n1q/n do::rfh a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from abod1 fo1rlo::: /c nrqanve)

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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, whfi8o.wd0 d7(v e:rk*sfal angular speed about an axis whose direction can d.kr ov l:sff,78 dwi0hw(*eabe 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 co 1tt/ b1w ykvmzn2u*z5nstant angular speed about an axis whose direction can be varied. In a region where a unifo12 yvtkm15n u*ztz/bw rm 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.a2 g/43qj/0 u)t,qc(si zvm)fd o3bdlx ztz 2j
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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 ajr uz8r gy eb2*dlc29(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 ag/2hny ()80k/szi ht kx1 enkk magnetic field. The emf produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved nortn5n g-pxeyz -khf3t*a (g( w8bfj1 7iphward at constant velocity through a magnetic field that points straight1 8jpetgg(w7-f( *fb- hakpnin5z 3xy down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a con9k hac9 n6ac **f(tslsstant angular velocity ω 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 generatos hgvbe9+r f+0caq d1)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 rotatetbxq 86g w9b )*3uc+m dho iew.7r.j/c8msqfcs through 60 revolutions each second. The frequency of tu c)mmfswqhojg39w/ x.8r6 +.q*i c ce8b b7tdhe 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 use,gbcu1 i,fkp5g /vd:pxkl /;sd 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 tha nl1(b8 ,vvr1imfn o;avc46zsj+ p ud5t

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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 tyed:(jzs7naixb )19 hhan the primary coil t1bzndyi9) h s7e(:a jxhen it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains mo1hfk jc9;hd( muh2 i3ure loops than the secondary coil then it is9i k3mfdcuh h; u1(j2h 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 p ; 32np/ogx2 tpr+szbrower input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circuit, yzama zicfhz8)v: g)2;4q-l g

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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 8.:brp5 oz u, xkxdf8pin series to an ideal battery of constant terminal voltage. At the moment8pfx,85dp ork uz:xb. 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 connected in series to an idet/7nl l tofi9o .i.g2w0vkbsyp90 f; ual battery of constant terminal voltage.k iuopl tl.0o 0ng;tb9viw/. 27fs9yf 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 i.b,c2/5 ly 8pa l gqdgwgf 1arqwfa843nductance L and resistance R is connected to an emf. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same emf, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductanjd4c8 9dbgu3 tce 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 inductor ap/w: ydipq+p x;1 p8owre connected in series to a battery. The time constant for the circuit represents the time x q+ww 8/pypd;i:op1p 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 ar6ujywf:6 n468lp)cd ljzx 4k be connected in series to a battery. The battery is suddenly removed from the circuit. The time constantckj )uyf6pbd l86jx4wnl64:z 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 n /0 oof)k/vkqthe same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this c); oi7c ;j-ym,vyojwlircuit, 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 supply. In this circuit, the f 2 nhw-w6ldsw6i 613auvgv7 was2hj1curren6 avs-wjn2 gf6 wsl67v131 dhau h2wiwt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactancegr (a(y 6zx4*kfg/dj t in an ac circuit changes by what factor when the frequency is tripledkz g/d((ta *jy6xrf4g ?

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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 toyi -p(oixr*8r nl,9 wcsn* g5i5zl7xhe AC voltage across an inductor is doubled, the inductive reactancii-sgoi*lo,(pylxz*nn5wr r 97x85ce of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of thez cxtxt733zvt,;wt * f AC voltage across an inductor approaches zero, the inductive reactance of that cox3xtv;7t*ttzfz w, 3cil

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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 circzr.bj( zpb* z,w u2.2p ba0nqmuit, the current.2aqbb, mzp2u* j (pwbrzn0.z

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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 act/r(1 kj9mdmhmapf2tx b/ojl95z8e86t y g;u circuit changes by what factor when the frequency is t dbu2/pk89a; /f ( 8jm 9zhgymrm5 6xt1telojtripled?

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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 voltxbsc 1w2vn7.y2 pc)da.3momrage across a capacitor approaches zero, the capacitive reactance of17 2m)d.p x wvmbc.3nrsco2a y 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 bgnpzf nu3649 between the voltages of the inductor and capacitor in a RLC series ciru6b fpg49n 3nzcuit?

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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 definv,eyq tn(w: 2hed as cos⁡M=R/Z, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R incres8det00ffwg nr2:.egases. When is this statement trff:e gs0enrw8gd02t. ue?

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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. 5a9t y7 qyhcyqo.s5eoz* 5wgo9uh:z(The impedance of the circuit increases if XL 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 circuit increases zmyxaef(x8zwj 88(j82h j,ddi/.rtz if XC 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 LRC series circuit znt/e (dj3,lwrxi:;n27hzhszbf 3xk +bs5i 7, the resonant frequency of that circuitd +xlzf: z3,w teib i3xzb k/r 5h7;jn27snh(s 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 zo5yqz/2 s(7flf xzk x6 i+dfj4jo5n*that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occ9co6y0+k 2o+ kxfzjzdwz *ce0 urs 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 4.0×10−5Wb 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 q ezmwn2;xw 5k-ube( 8uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and -2ku;5wme w8 exq(nbzthe 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 rot)dc9rq-bz8 - vya n*ae2xab o3ating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop anbq d9rae-y8z* o-3axcn)a2 bvd 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 rotateyfp6qtiugb ,c/5ui 79 re91y ing in a uniform magnetic field of 0.20 T. Find the magnetic flux through5r c,/f1pt6g7y eubiei9yuq9 the loop when the plane of the loop and the magnetic field vector are at an angle of 30∘.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional a rdh7iirm4 jg 18j0yits*7h9mrea of an adjustable single loop is reduced from 1.0m2 to 0.50m2 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 c2.n3pp5zl t yht ny,7x2f dka(hanges from 4.0×10−5Wb to 5.0×10−5Wb 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 9 h*e6fzg /htq+ hw5nq08t .t2ajyzkd200 turns of wire on a 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 T to 0 qk0.*ta6/+tjndq8e hh y9 zhwzt25fg 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 15-1ctzr5 aieus ;c 544/utyue u turns and an area of 0.40m2 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 iz *m.6(etha zarea 0.20m2 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 hori+ hftec1w8 ix8 z1b5qozontally at a location where the downward component of the Eart 15 +iq8hcbwxfz oet18h's magnetic field is 6.0×10−5T. 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 coq kzy5l 8n1j:onstant angular velocity of 2.0 rad/s about a vertical axis through one of: zqj8n oly1k5 its ends while in a constant magnetic field of 5.0×10−5T. 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 aadnj6 j a;sa/20pza n8 cross-sectional area of 0.25m2. 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 1sfv(*gbidf ;lw( 7a* i00 turns of wire of area 0.090m2 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 loop oq ym ,v wofga:5jn6*2f+p(btis 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 axiw+ptg,f:oo*yqva ( 6fnmj25bs 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 m 3hzabf 3rk(:of 100 turns of wire of area 0.090m2 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 gennt 8rnd7t :.twfdkyv + 0ki95ferator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the .dkntd: r9f08y f v7tk+wnt5irotating coil is 100cm2, 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 gb t:x5xow,d1w 4uhd( agfcl1w;l6g*)fuu k/f enerator with a maximum emf of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of 0.030m2, 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. T29 g - fn(*vv 2q.b 1rtwx4s7eg3wrhhv jj:iprhe motor operates on 120V 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 resistai 1j u) k 3p,dfz7bkww+hfa(i.nce of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a backffa ( .j)3w+k1u i7wzkdbh,pi 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 6*ktetb 1bzwl8(r g5k power supply. The operating current is 1.0 A. What i(rgbt1l8 kztkwb*e 5 6s 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 resis16*zqaag 5-,k2 zzok* rt76n vkond*iplu ve 1tance 6.0 W is connected to a 24-V power supply. The operating current u7k nkz q2 1i6 dz*at* zo-*1vakp,e56ovrg lnis 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 c6h ub3kp0(da( fv c0k6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at v0 fa kb(dhcup(c 36k0full speed. What is the back emf when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primnbum +0ninvxa0g9 nr38rn1 8rary voltage of 120V AC to 6.0V 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 4-hoqy7dt o(*sobgd /causes 14 A to flow in the secondarq y7h-d*t/oogd bso( 4y. 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 1g*,d5 sk ;-iin+yy bfs10-V primary if the 24-V secons n ,y+ gydi;fi*ks5b-dary 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-turn secondary jehdqq7 1ri(0dsm x2z6lydy 5.: 3czgcoil. If the current in the secondary is 3.0 A, what is the current i0yszyj:ddzq3g2i7 er(1 5 lmh6cq. x dn the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efficiewns:s+1fkc+ bske u- 4ncy, how many amps at 24 V can flow iu fsc+1s4ke-wsnb : k+n 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 750g bw-zu-h4 mm0:bhpk-0 V at 10.0 mA. The primary coil operathw p- bkz- :u4gmbmh0-es on 120 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 turnevp 7bl)v-7pw5y dyn 5s on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in n)77lp-edpwvy55vy bthe secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on *3vahn n1 0ffga /9qvkits secona3f/n0kv* aqn vf9h g1dary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turni4( 2pfa*oxvoi6ttt()f- vwiqx 7o- cs and its secondary has 200 turns. If the input current at the primary is 100 A, we can expqw-i(vf4t(vcoo2po-x6i f* t)7itaxect 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 hase*i -z0wmlc6z 100 turns and its secondary has 200 turns. If the input voltage to the primaryez icw6*0 zlm- 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 transformer has 100 turns and its secondary has 200 turnsb+74 au4ibeuf (fmy6 u. If the power input to the priu y6u+mu(7bba4ef 4 fimary 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 steppe+3q f:d bo2zz,ytz-eyd up to 4500 V by a transformer and transmitted through a power line of totalyq+dzez3: y,fo-z 2tb 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 120 V. The voltayfygaie xy 6*1xh ugo 3/xtxg+j;1/.kge is usually stepped up to 4500 V by a transformer and transmitted * uogf+1 j/k/xxheig;6x. ayy3ygxt 1 through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually s ex6d,icxgud s 75ww1laa p ay7yt0/*)tepped 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 voltage is not stepped 7y /6w0 wutl17ax xay*pd,ac sei)5dg 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 tohuu m2e(rha37o (j1ngtal resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to he2hg1r amnu 73u((eh joating 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 resiwv oy1.nrml/* 4hi(ejprrv 4: stance of 0.60 W. A generator produces 100 lmo.:e1 pvw4*hijyv n/( rr 4rV at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What 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 woul+,hk-xgy ,td pd be lost,g +py,h- txdk if the power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator *na;tlmy:7jfh, 1cys c ed,r 3is 440 V at 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.,rya ey7cd:fs j3lm hn 1,;*ct010% 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 hax5c / (5o2vyuw*hjg of 5.0 A. How much energy is stored in the coil's magnetc h vh25jguo5/ ax(*ywic 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 6.09d8zy w g92zo-e zcx3x-W resistor and an 18-H inductor. What is this circuit's time g82dx zy-x 9ezzw9 c3oconstant?

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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+11g kz,e rzdksf c-(i rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak currentaobh2w0*1trl9 q1 vgh?

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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 i1qnj.2td 5lva te t;s3nto a 120-V AC outlet. What is the resistance of the lamp? vn3;aetj 215stt.q ld

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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 xu4u 1--b eklf8fd yo1sg; 6(hpwg voa t;ji4*peak current through the resg*-obsfakidgv6ef y 81 thlx ;w1(u-j4p4; ouistor?

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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 a o i4gb+x468qh 7krkjp2dln-o/j.fgt c power supply. What is the power dissipated in the resisto 6ng.tilhrpg-b4k o47q2 j8oxf/k+jd r?

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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 g 0g(vub-a3q dk )bvcwn2wa ei0z(9(u 50-W resistor is I=0.80sin⁡(240t). What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resist/k 2kpmu 9hw,8 uctc)qd2rfd9 or is I=0.80sin⁡(240t). 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 resistor .ex2:av8ikvo t:3;xvcj 5 :bnyb- isq is I=0.80sin⁡(240t). 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 oihkpp* n +2v56i1 q 8bphmso0tf a 1.0-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* v7 6y-jqchuu-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 ha gqddn8s+c/r6k :csx9ve 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W h 5 vjg4pys,x)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 1244 t4 -um+jw t8hsi;im)ogzac 0 V AC at a frequency of 20 kHz is app 8ts-hmwc+;i4u 4 goat jmi)z4lied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V,x 0jm 61ox0y:v gc-/jmdjp-xw 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 5 7:h ga+eq bztfn+,n0wekv9 vcapacitor 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 ha yzq i,j9tbtic47 3oo9ve 50 W of 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; hws dgd4pj6f)/xz;hkr )zm3 a 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-m)v: z1m ub*)bnwmo8t *a qjo8oF capacitor be 100 W:j oabz1omb8vn *mt u8)wq*o )?

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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 0.0010pmxg4)8vhdb 1 ,kvw+s -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 ak*ho,gtq9s ) W inductive reactance, and 10.0 W capacitive re9o k, *)gasqthactance?

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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 a:n15edfbc55*boy i yc t 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected *b5y5d1f e occ: 5niybin 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 re.i:oj u x6k(bet,ow6)m w 2togsistor, 20-mH coil, and 1.0-mF capacitor are connectedm o joouw6it .2gw:( t6ex)k,b 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 20-m(x/n z -d-rdqfl2h yk(4tcr2pH inductor, what is the impedance at 12p 42ycqxtf-(rnk-/z(ld h dr000 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 ser zw5r,wo+ tseltwgc/qn(:79 m,6t soyies with a 20-mH inductor, what is the phase ag,le+mn/ s:sz7 qt6t y(,wt rocoww95ngle 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 series circb b0k j- ajq.3xvn(qk*uit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 bnkvj (baq* -0.xjkq 3W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the followind1qsc*q+19 lmsy r/+vr)ezx ig capacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedq+xycls1qe)dv r9+r1*/ izsm ance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz f0eu6nly w.3u.h g pu9uor a total impedance ofpwu.03 y6eu9guln h.u 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for a to*o. mb(,md kanbeyix :p+5,bt euc / yuyhx/1(tal impedance +ect* xm:byi,, k 5/aubbued .y(h 1o/x( nmpyof 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. What is7 zmt:n6 3yjhs the impedance at s7h:3njmt6yz 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 8pd *mqsh n-tzys9i5- kHz for a total n5-m h- *ss9q zi8ptdyimpedance 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 +st6(y 1qiq;orjf)q lr a phase angl q qt;lqsrfiy jo()61+e of 40∘?

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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 a5jt hi2(yepu3 total impedance o th(uyj 2pi53ef 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 casdc(/a 0)mx8 nxpmkm0+he 2yapacitor at 120 Hz. What is the phase angl(xxs2h8m )0ey mp m+ n/kacd0ae?

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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 10dldgr) z+/az/2k k ef/0-W resistor, 20-mH coil, and 1.0-mFz2a/+)/ gdl/f rkz dke capacitor 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 con9i,u hjvl94in ,7(5r-l f1xsz cjmkfisists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120jiih1 ll9fsuc ,nr(fjz7ik459m,xv- -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 reactance 30 d(m 8dlxbo+-s )t vv1tW, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current 1v)x d (-+tbst vmod8lflows 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 ser ugh7;3*y+evcz4ol1wij fbzn; 0 ugf-ies RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, zicz1-7 + 3gulw;gobnjuy*; 4 feh0f vwhen 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 withszz)64fjo k ni ql7;,w a 500-W resistor for a phase angle of ,6i;fsz zn7)wlkq oj440∘ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequencx5zq9hk nnr5 d2q);n ny should the circuit be driven in dqk2;r55 zxn9nq nnh)order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output indb cj-8( roqz j7lgo+- an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive rea87- lo (corj zg+jq-bdctance, 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 circuit i g67 d pt7ovp+s0qeg4es 63∘. 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 impedanc3fs-nno3-ga ee of 60 W and a resistance of 30 W. What is the power 3-3 ofgnse- nafactor?

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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 abjj( v)o)1ho * hdg+ vdfy.8ah8xl/vfor a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.h8 ovd+ dxjvh )*j(g)ayb/fa hlv8 1o.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 frequency of a 1.0-mF capacitor and a 15-j *epg l)wwl qytz+p3v8v+h(tmp:m1 *mH coil in series?+ qtzwj +leh1: m (ltv3pp)wpm*g8y* v

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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 reso-eq52 o 6w9 bcrygc)dsnant frequero5 g-yc q6db w9e2s)cncy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant frequcw g7srtp,a9 k0fc4s (ency of 10004car09 tk pcw (s,s7fg 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 serie 5pz; hwz3vax znh 5y,h1u,vz+s with a 30-W resistor and a 40-mH coil ifhhz,,pzv z5nax5hz1; 3 yvw+ u the resonant frequency of the circuit is to be 1000 Hz?

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