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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 unitaxwknu6+c-)y 19eui a 3d0kvb * cfiv1s of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that tf4 i2s s)9n1k+kpqd:bc7 nztn73a xczhe $emf$ 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 ;zf *)s. 9abtt(dujf .zq3nly kind of change on th);jftszqutyln.3 z(dab f*9. e induced $emf$, 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 fi09dz.xz8.pvowt btk5-f v6ow eld through a loop of wire produces what kind of change on thexw8 9bwt.vofz6t- kvpdo50.z 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 a wz14z;6ilc lsaly0 x 8mwxcv(dos6.c4v.c /what kind of change on the inducedx / l cws.4l1l . v saz;zimycv66xc0d48woa(c $emf$, 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 magnetf. pxu(ak h2hseb0v :3ic 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 +q.k zku)xddh4xs qg q ,v4 (egum4/-fdirection of an induced current in a conductor will be that which tends4,44hq )fv-g + dxu zs.gqxkde/(qkum 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 flfh *qr 025mfecat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. e50fr* hf2cmq 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; ; :uikj tx-qcqphtf30 f5ro2 table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed fromif5 tfhxqp3- r ok;:ju0t2 ;cq above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic fin 588dydd7ihl6ohwt/eld vector points straight up. The magnetic field h8t8ino 56/dlw dy h7dvanishes 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 regi kuuvhozx;dw+* v9oz6u.s*+won where the magnetic field vector points straight up. The magnetic field suddenly grows stron6uu*zw hx +zvk;9.odv u o+sw*ger. When viewed 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 region where the ma i3w-c o z a1o vwwx8+tl+s9m3bmf2f4ognetic field points straight down. Thb++xomvt1o2f s lzwa8 3o- 3i fwcw94me magnetic 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 on a horizontal table and carries anj ogygf s8zvu( )(s/h- ever-increasing current northward. Two coils of wire lie flat on the table, one on either sijgshof-y v)g(( z/ u8sde of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north p gu-b3ueq4 kyuje9-9o ole entering first. As the north pole enters the wire, the induced current will be (as viewed from eqgu49buu--j9keoy3 above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular spevux- hzs,k9o/ ed about an axis whose directioxsv - ku9o/h,zn can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the 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 constao6p gc(8(rha knt angular 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 ro g8o (6akprh(ctation 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.l 7t6sqz1 pjz.z) on(aqcb e1:
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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 thnjplm3- or )d9s q d74r1gyq*tat 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 b 9xfyi .+jexeak -9-oa 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 i rfv;vy +ik6;xn the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerni;6yx+ v;rkfv ing 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 rot 5jd iio;9p:9+bhu9-jltwyckkh.yi; ates 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 transform 8o)s zmcg7,(ilv:bz/jfzvk 1s

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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 xr ndm1rhcgv7nyy(1*,76 jei each second. The frequency of th*7,n6g(jvx1r1dm7yyirne c h 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 device3m 8q6wdg;o ny7 :mrz, 67:mm a3coni: xshwmn 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 devicf)n ho6ixdx 3r3m3nnkvm 8zznm+h*p) 8 aq,8 ue 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 s vgg px nffp)3)9:h-byecondary coil contains more loops than the primary coil then -:)hp3f g nxv )pg9yfbit 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 than the secondary coi5na +ofvz ,ub.l tfouba5v .+z ,nhen 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 /,f yewsd3l:oinput

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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 resona ppkcpr*yja.1 ltp*08nt 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 oyye(9a42/(wyed zaj7 q ;jhwconnected in series to an ideal battery of constant terminal vol j(z;yadq 4eja/ yhoww (29e7ytage. 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 connected mlp5j,c67ri+ hy zs+z in series to an ideal battery of constant terminal voltage. At56mj+ iczrz,sl7yp h+ 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 and resistance R is conl ,x35 lg5. pvt:q:i+ukaeucdnected 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 iee lhs p)x2c.0k)ln1is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an in w tqdf+rjw6/x/0j3-lai slp6+i a7ll/z 0cyqductor are connected in series to a battery. The time constant for the circuit represents the time required for the current to rejlq/+xlrsl3/w dj0l0 i6 w6 iy-z/q7cptaa+fach

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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 serigc0y 0j1 h7 jak(pq9d:aubu8fes to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit re0h1c p yabafj:g8d07ju 9(ukqpresents 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 eoz ghhuv8k. 8/(na r1uxcept:

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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 thiso3+dutnj)o8byo o6 sx/u z8ikcfhw*4 -am90r 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 supply. In th4iiiyb/( ic r0 wb96t *7i p)w(yibxusta 6d-dis circuit, the currentbia/(dc*pru 4t0i (w-6xdbi w i)7t ibi9ys y6

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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 bn1ry9zy p4yk) 5dy;rfactor when the frequency is pzdyy94 yn y)1kr5b ;rtripled?

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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, the inductp;rywt 7+j cklygm; t 6o;f;5;wx6wymive reactance offyrt gjct mwmy766;;k; l wpx;+wo;y 5 that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inducgtb)),uk-ta ;l zae1ptor approaches zero, the inductive reactance of )b;aga l ue 1ptk,-z)tthat 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 circuwas)c-a h o:-zit, the curre)chaz -:- oawsnt

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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 ci/ob 08 zm wa+k-pq:ikcw,t 2jwrcuit changes by what factor when the frequency +p-i :a wzw/ot0kjcbw2, km 8qis 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 zertst/r i-m+;pyc0) gjq o, the capacitive rea q;-+ )tpgj0tiscr/ymctance 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 betwew c 00xb;w6)sfjb)rf*3 xqtggen the voltages of the inductor and capacitor in a RLC sercwjb 3xx*0qb;)f6r) fgswgt 0ies 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 definh6gh*,j8 u rrded 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 increasys/8h8gjd2ns3r 5aoq5 +mx xyes. When is this statement truey8 mqhynso 2 5 3+x/x8srja5dg?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circvgq):b,o (y3p/a,d4b oeosx vuit. The 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-22nus wuj7a q circuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC serieatumi4q 44+ ku.wgz4q s circuit, the resonant frequm u.q+g 4qka4wziut 44ency 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 applizqlx/ q4;l5 ds* cq4eced 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 occurs wksfz)dbrh; z9qy) 329 xffc x1hen

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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 b ,t :z1xvff+rm is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flbfr t+ zfv1:,xux 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 0.10 m is rotating in ai cid+0oc:k 2(xvj:eoj7wz +m uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the p2+i:jkcwo dx+oj 0(: me czvi7lane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m.f c(exs( lgu0bpr45h ;l q6as is rotating in a uniform magnetic field of 0.20 T. Find the magnetic s u;(gqx per.ls 46(0clabh5f flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of ,9 mew/iwuhovr f r2)4y 8ityv7:4q gaan adjustable 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 changesvmwn0 7k .tmi) 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 fralx1jc 5 l o 0yr)xqacavp:cj)h2:o g8,me 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 in 8.0 s, find the average value of t)a1 a,l8xvo c:hl5qo2cg j)yjp0 :rxche induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an aritvfib)pvy8 28;vg4 )mgf(j m ea 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 arfhc2 u .)8rbnv md9n *fua4p-bea $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies hori0c si(s5kwgb1dq mri r211 5imzontally at a location where the downward component of the Earth51qd(wsr 1i 1is ibkrcm0m25g'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 ;cl39 (xd zqot0)lmlq m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant mag;q3otl0m (l)dlqz9xcnetic 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-secti3,6+ a8ubgii xlz:tudonal 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 ofwycx s;y/6rwa /sl4r0-ki9k: xkgk:k 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature.ii;pj b5 in4*dr: hx:p3ewui; Each loop is 12 cm long and 8 cm wide. The ar:pi5 3:ihid;pb*j ux4; r wneimature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns ofca dsd2+z.sbyn0 enfoxo m 1bg 368+a: 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 outp)gk+z;s *kpud m zg53hut of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotg ds;) zumh+kz 3k*5pgating 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 pi nqrew)/*wjwh-xs 1 )f .3dbgenerator 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 of 6.00 (a nw(8 z0p 3jhszbt4cW. 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 resistance of 6.00 W. The motor operates on zrg53z+.vnu w 120 V AC, and when running at ful+rv5zun gz w.3l speed 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-Vv9l3(.r5*wryptq r ll power supply. The operating current is 1.0 A. What is the start-up curr3l*vlrry9ptq 5 wr.l(ent?

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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 6s0;6dmpuqf- xwph ( p-.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the ba0ph sm(x;p wq6d-fu-pck $emf$ 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-ddps/(75l)o dyk(dq*a yu0gvV power supply. The operating current is 1.0 A at full speel0dod) uqvy((5ddyp/ 7gak *s d. 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 q0/h:z uz gjc-gim(1 m;t8mxu a(h qi5is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the secl)p;oea( g -n04iu,s ej fck,yondary. How many turns are ino; 4e- py,klji)a( ,unfce0sg 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 ma1 +uz 1j0btoypny turns are necessary in a 110-V primary if the 24-V secondary hoy1+z u jtp10bas 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 a:vlo:di k v:ig0 0bgy)nd a 2000-turn secondary coil. If the current in the secondary is 3.0 A, whatyvgi kd: 0vgo: i)l0:b is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efficievveu2 6 bn2as,ncy, how m6sv2 bva ,2neuany amps at 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 of8,d zbli q-u n2 8 1ainkrxl8 g+6im;bu3nv:if a neon sign transformer provides 7500 V at 10.0 mA. The primary coil opeirkn1 u b+ -3nv,x l;dgilbaz:niu8mf2 68iq8rates 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 turns on it4mc1 1y)/c;v *bwnz mqri 1o:anaj)vo s primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A isn: aijb)o co11nw)vv*14;cm ym /zaqr applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turnc h4hev 37z:voi nl5m.s on its secondary coil. If 120 V hm iohl7v 3. :5nzve4cat 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns ancq9rn4t f/ t+agn*6 qnd its secondary has 200 turns. If the input current at the primary is 100 A, we ca/ g6+qfnt9ancqn*r 4t n 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 100rqyx9q9em2*+ 9 z brhju lir78 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output volm r*rub 2y 89x9ih+lej97qzrqtage 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 htvwvco8e 3d;y,-qx-4h z ;pxwas 200 turns. If the power input to the primary is 100 W-xx8, dywz43cqtwvh ve-o;;p, 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. Th q4tvk fodt9- r1/zas;e voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 oq vs /rf4kztd-19a;tturns.

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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 volta4 ;.nssemp-sdli2j,yp 7y*4kz(tjy sge is usually stepped up to 4500 V by a transformer and tran*y yks ,niz s4j mt(lj; esp7-p.y2d4ssmitted 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 oq6wozehkm+1 5 f current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line ofe5zw6 +hom q1k total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission li6i+ z tun8zzi :.sn+dene 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if thi .iz8sn+tu+n z:6dzee 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 6c.7u5de8fbho tk g3p km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transfo.ubce t86hp5fk7g d 3ormer 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. How0g 4 89rrrvrj18m:9hzrdd cwk much less power would be lost if rrv0 1 jh9gr:zdmd8w4kc 89r rthe 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 generatn9y9 yusm ob501- hb,iowae2 tor is 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 e0s1yu 2bn bw,9eioa y9tmoh5-xceed 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 *7 is7br8 :kyai*nbr la current of 5.0 A. How much energy is stored in the coil's magnetic fb 7bky:*r 8i a7l*inrsield?

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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 resistor and ,4lbmu y koz.o2j (t1jan 18-H inductor. What is this circuit's t,yjjomt4o k(2 bz.lu1 ime 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 isuz s.(1 jae3+bfm,qf n an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a7u*+h+2bhz go1 ehzds b 1o1n; htpgm/ 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 120-V AC outlet. What + tle(c3sb j:tis the resistance of the lam3sjl(:ebct +tp?

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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 powe9d6n3 t ibc.yi:; dc;a2/kff,qop ekyr supply. What is the peak curref 9ibpfc;e;k:dod/y,6ya ikc.qn t 2 3nt through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected tm+oew t :r)gd-x r3f:gcbmxr96v v)u0o a 120-V ac power supply. What is the power dissipated inc r)be xrm 60w+ft-m ogugv:vx:)d39 r 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 resistor i4vv9 0ejv3 /uk my8lgonq.zd-s $I = 0.80 \sin (240 t)$. 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 iqwcq)4tq 3x q vqch6 )0q0bx*fs $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is yyn *56u +gvdl$I = 0.80 \sin (240 t)$. 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 ia-/cas .(jwh hnductor 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 tg446za c: jvx l,w/ +0tneijea 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 ha ,cq y0(:zvqzqa: 5 pzed/-e+xogzn5hve 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 of*s5f ,wab)tg r*nk*l h 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 n3zg74 9yk dnq60-mH inductor when 120 V AC at a frequency of 20 kHz isz4 k3 7nydq9gn applied 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, 60.0 Hzi; u7cvzji8bx 8e 2t2s 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 react-j/cv 36k3shvb z ep: t8g(alv o*y*bnance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed t5ovgf4hu l04j pgw5zr)8dy3xo have 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 a 10-mF ;vu7n h98o waxp9uw p;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 reactgvwvufp(ea g2a7 ( z.9ance of a 0.010-mF capacitor be 100 W?g. va wg79(upvf2e(z a

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and231sicpb, n ao 7xpxc5 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 resista3amynwj31qk ) ,qz1g,xpm) v xf1vpa,nce, 15.0 W inductive reactancepvjx3q ya)avk1,z1x g,)mwq n 1,3mf p, 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 resi((zbj p5-nso hpxrq:.stor, 20-mH coil, and 1.0-mF capacitor are connected inx:b.5n (r-q pszjpo(h 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 dy:/ft a:v gy ibzq/07100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serib:avqf// g:it 0yzdy7es?

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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-mH inductor, w ndbcb );a5yxd2gt(2what is the impedance at xwb2 y5ncga;2)b d(d t1000 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 indja84 1 zlhez/tuctor, what is the phase angle 8j41at/ hzzle 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 circuit with a 20-mH coil and 76rscfvyi8; m1.0-mF capacitor for a total impedancrsmi f6y;8c v7e of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following- dqf /ec-tcp:9qyg 8)ujp nw. capacitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 ypq c8- c./qw upd-ntfe j9):gW 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 bed,w3e l6zi8oj b07;uqa- d znh put in series with a 450-mH inductor at 5000 Hz for a total impedance of 4007d6jl n u;izoe a-q3 80hw,bzd00 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 att7:be u*2uvm tx4 dai go..6nm 1.0-MHz for a total impedance ofunm.ti7d ba .*v og: 2e6tx4um 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 c ;8z,pf2aa whb2ea c8wsg1x,series with a 20-mF capacitor. What is the impedance,gsz aw 82c 1ahpb 8x,f2caw;e at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at3+:cu96npm zjwrr(h g 1.0 kHz for a total impedance oc+ gh:z mrru9(jw36 npf 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 ser8rq(fon2g lf 2h ,zks/ies with a 10-mF capacitor at 1.0 kHz for a phasqf2sg8/kzf(oh nr , l2e angle 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 needed in series with a 30-W resistor at 1.0 kHz for a tota5alcr 4z rlt((l impedance ofl(trr c5 4l(az 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.m5tk) bhw9 (wfvi z2 ,ijtxz0( What is the phase anglezv)9(,( iwzh0 fikwxt tm 5bj2?

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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 m6 ,+ kss+plu ba5:qbhif a 100-W resistor, 20-mH coil, and 1.0-mF capackuabhs6l5 qb+ ,+:mp sitor 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, a 10.0-mF capacitor, and a 0.v /10d fef deiiqw9x. ebxi(e)4o8r+e 350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the cir(ieer.0be)9ei+ /vox 4ifw d8xqd f 1ecuit?

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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 ,w8-cpuq5vo3g np/ ozreactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuizpgno3c 5, - w/v8ouqpt?

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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 contaiocepzy s2n;2:j(n*hp ning a 50-W resistor, a 10-mF yz p 2ench*;s: (ojnp2capacitor, 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 series with a 5a er4 g:yal g*d)xu64r00-W resistor for a phase angle ofaylr* g4r)aexdg:6 u4 $40^{\circ}$ 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 mF. At what frequency 9gpm00e vmj::jb n5ya should the circuit be driven in order to have maximum gn 0e5:90mb jmy:vajp 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 c 4-qv3imbv2rv d a:c6p4xan1wircuit with 12.0 W resistance, 15.0 W inductive reactancei6w13ma4avcvbd-4r 2qnvpx: , and 10.0 W capacitive reactance, 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 cinvd19qlo 50d b.wtp u;rcuit 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 impwa :dnzi(e wld o7p/ ;m/rg+4x.u5 gnpedance of 60 W and a resistance of 30 W. What is do 7nm; 5w(p /pi/4rna+:el xdgwz .ugthe power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuj 6;y4va led/9s 9w2bllpnyz+it containing a 50-W resistor, a 10-md9zy 6na2j / + lvyewl4pbls9;F capacitor, and a 0.45-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-mH coil in serie6z cz0 71skjd+bth ;k o.*p1vckbzy t;s?j10hk.cdz1;tokz kbctpz 6y+b7* ;vs

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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.fs0idsofsyk 0/2riig6y )+ an series with a 4.7-mF capacitor for a resonant frequency of 10 k)o6ys+yrf0iia.0/dis 2kgs fHz?

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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 +m51ixh u*-2 ppyplyeseries with a 3.7-mH inductor for a resonant frequency of 100e-+*hpp 152py l uyxim0 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 mu6 ea7f8 1jsmy;xlb nw9st be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 Hz?;6ely8nbs1f ja7 9 xwm

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