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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 un 0sfh ytb2zq9: )yami,its 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 inducti-kjbh04bl * xeon 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 in ayo8 gi6:8fe v 3* lg/y3rxos,bk*nlng coil produces what kind of change on the induced3*:g3o/nilybf*l 68,gr sg evxn oyk8 $emf$, 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 ,p,;vfzm4,6d5h gevexgxf (p field through a loop of wire produces what kind of change on the induced h(xx ,pd4e, gmp5ve z;v6gff,$emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what: t(v6c y6mhl jg+5wzw kind of change on the induce l(zwtjc:+6 ghy6 wmv5d $emf$, 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 magnetic field q ,/d w7a5yx+gzsbwg9an $emf$ 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, tvoz,c qw q/h6. 36 gjcefm7x.nhe direction of an induced current in a conductor will be that which tends to prq q..ecx hv zf ,o6jm6cn/7w3goduce 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 flat on a horizontal table. A bar magnet is held nl2w)( njkck8above its center with its north pole pointing down. The stationary magnet induces (when viewed from a)2 k8kc(w nljnbove)

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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 b c g2okj9ga./table. A bar magnet is held above its center with ij2g ./9 aocgbkts north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where (p(l zb ck0zr(dcqu( 7the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the fiel(cp(ldzbrqz(7 uk (0cd 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 rj(zbv 3pn 1p+b myuni .1di.i7egion where the magnetic field vector pointndi1y3bv+pinpi u(.z.7b1m js straight up. The magnetic field suddenly grows stronger. 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 wheki xz)b4teen8.+x7q/kwq 9u-gb0a pmre the magnetic field points straight down. The- iq7zk8 /4 we0+penq u bka9.gxmtb)x 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 an ever-increasingp kpr.h)tnf)) lk4a264dxh ee current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewp4rhx6e) .d2 pnfta khk) )e4led 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 throughe66iizb l (/qyovbv qa, v:3.b a loop of wire with the north pole entering first. As the north pole enters the wire, the inducvblb vq ,/.qv(ze6yb:iao i36ed current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constmsl/y )jd vaygw 3p)02ant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic fie)adp j3vy swg/ml2y0 )ld 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 w tna3d 5wqfx;xudhe0lk 57h:4hose direction can be varied. In a region where a 5d t54n wxdu0q hfa7 x;3lhke:uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law..xz)aplb4 7 o8snu r.p
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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 tmpy ;w(hk h .l;uv(i0chat 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 ak6 y*y(o* chvuvt),k-.cxe lr 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-wr-ln-.l1o3b 3yylitnwr*q ; aest direction) is moved northward at constant velocity through a magneti3 3l-r l.w-yt ln*n;r1 baioqyc field that points straight 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 constant angular ,o p1x:o kuv308p0frnff+ef hvelocity $\omega$ 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 transformsgsisd: et-4dvu h w 28.p28aj6fau 3bv

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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 revolc7w6ecv008)o31gllgam 8q+ xpuyfxqc xf v /4utions each second. The frequency of the f8l0 )uxg8 gxw/xy f m1 +qc7ovvac 4q0p6c3el$emf$ 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 used tod))h1y bcuw xs3e3y i*bwx )6a it,q2r

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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 devi6dvw+s eesv,z.i/nd 8 ce 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 secondar6ioaj0o *r7 m6+bqhuzy coil contains more loops than the primary coil t76hamujriqo b *0+6z ohen 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 pri)qi (eeb74ax5gdu1rmmary coil contains more loops than the secondary coil then it is a5g b1 (d iqre4)aux7em

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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 pmmj .2b a2hr/ skdx*1n66o 1egbymo( uower 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 f6l9p ws.xv;wcircuit,

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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 *mx uzt x/pknsp6t24pneh .pv688 p3mseries to an ideal battery of constant terminal voltage. At the moment contap6t t pvszn8*2pke p4umnx6m3xph 8/ .ct 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 ideal bashk58lnu -y2dug/h w5ttery of constant terminal voltage. At the moment contact is made with the battery, the voltagn /s5uh 2wd-8kyl5h gue 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 resist zb k x(behc)*)t-ur:0tvsk4dance 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 ind7rm 1r5xei rvi(br ,y-uctance 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 are connected in series to a battery. The tim-.6 nmfsv4v2)w1a, wwsi )9 qmwf gqn8 xvnd;pe constant for the cirssmpmv48nwf;f,v6 w- ww .v2q1ng)d )9qxia ncuit 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 induct59cotfu pgp18+rjf4 dgar34 tor are connected in series to a battery. The battery is sudden+3 r9au gpf4ptd1fjogcr458 t ly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same unitsb;oszi - 0w+bn except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the cu1:ink pi88zr drrent

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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 i3sk rzdxfa4ama64m6: un -.gan AC power supply. In this circuit, the current4ausk63ia m rad mx f-n.46:zg

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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 fact s: (uk7wna pkng:mg5xh9f/v9or when the frequencwun7k/: 9x v m5:fggkn(aph9sy is tripled?

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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 inxnd2nwa ,c,:wr,y5 nb4u92*u9 w g pwaipnzo2ductive reactance of that inductorx,w2n*aw pa2 n w zwribnduon4c,,29 gp:uy59

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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 acros*))j2y 5 biw)4neei2o.tnh zov t nsa:s an inductor approaches zero, the induczh:5nsab*y2w)o4.n i tv n)t)o2ee ij tive 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 power supply. In this circuitbio y1guupr- hg ,s06(, the currehsop g6by1g,r(i - uu0nt

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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 .a+p 1esmclxicg4m /l: x5xq-rcuit changes by what factor when the frequen5x.+s1gl:lc c p -xeimxamq4/cy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage acrh,pt9cbw4mto , ms s*9oss a capacitor approaches zero, the capacitive reaco mw,tc,9t ps*bs mh49tance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor in a gely r;k4 jo1znr,sjsz9 ) i39(h wgd*RLC series cigonzy93)(1dhr;rzk gji*ew, s9s j4lrcuit?

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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 wn(n8ilz4d ztdiwr-h ;t is(m+ 4u63 eas $\cos M = R/Z$, 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 ir9;dohc:+cx m ncreases if R increases. +r; c9d h:xmoc 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 impedance of the ci8o53i5wnmuut 28mx2*zgkn gr ol+e i0rcuit 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 circ) (j;cz3 aiwjlg03tqxuit. 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 s869mv *lz rdrb*,thr)6 ylm tj hn+3beeries circuit, the resonant frequency m ,3de6b m9ljtyrnz6rhb*r)8hl +* tv 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. At resc4/-a icm(hqff kg0(aonance,

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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 when+8ej px8hkl2c

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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 unifoqs;m nk) ci9a*od.a.grm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of thgk; q.oa)a sni*cm 9d.e 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 ca0rb*)jni1 d 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magneticjn0c)d*i r1ab 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 mk:44w*nu p22uwvnu dy2t m q,q is rotating in a uniform magnetic field of 0.20 T. Find n t wvuquy4np,: d4m22w2 uk*qthe magnetic 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 a yw*: gj6au 2zbp18 ugq7wk0jwn 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 changes from.hw:45+ ihggrk)a g ridn3y(u $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped witigq 2psv753/ s.ghn ndh 200 turns of wire on a square frame with sides 18 cm. A uniform magnetic field is ap7sv p./d3shn n 2giq5gplied 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 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 qqgva b:wq6;zj7)p:/ezu7 dy15 turns 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 area 6vkvph7 sn2* b$0.20 \; m^{2}$ 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 t :(5du es0cm v8vdfh284lsnykfrv+7 m flies horizontally at a location where the downwar fm8trkh cesnfys+d87 0(du 5:lv24vvd 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 mb(8 +tk/ic8 -bjh:vs0d8 gtbqmf zle. long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one okgsbi-d 8v8 bq 8j fcle(z:tb+/.m 0htf 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 j6j j;4yg8*notnnp8 w.ik qm8loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists qegg-7qrom75 l.j(qq qv r n4(of 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 itsa 7c+blj1yfp * 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 per7p1 bjly f*ac+pendicular 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 of wfw+4w wcevd6 n+ gjk9,ire 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 construcslu3wr8) 4ps 9 dwoat1e2g l*tt a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is waw2pgtslre9s3)tu do*4 l 8 1available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generatorc +v6 bgku4st9 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 DCo-w ltw50m0gyf:a.tu motor have a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resicx r+;m,s/n 3t(zavzystance of 6.00 W. The motor operates on 120 V z;vymcs,n x3t r/z+(a AC, and when running at full 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 toiu k0iwbf. -t( a 24-V power supply. The operating current is 1.0 A. What isk (i0utf-wbi. the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suppda8bvc:et 0lxfc ms)(8,f 2zply. The operating current is 1.0plv 8d tfc),:fxb0z8 cse2m(a 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 p-n khc9mm 0xys bwu1f2*xn0. a 24-V power supply. The operating curren hc.n 19yxwf00nx*2sm m u-bpkt is 1.0 A at full 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 primary vol;f4ycv wg -g7l ou/7cktage 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 secon*66z bn jriitrc9p)u*dci6n z*)jiu*r9b rt6 pary. 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 manftg )b4n) x9fsr sw;1sy turns are necessary in a 110-V primary if the 24-V secondary ha9fr4bgsf;sxn) 1t )wss 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/ia/ 69 ustbvows5c/ 3uyzj ,e a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current /u6 iz /,uove9a3y/wsbj5tcs 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 transforme fn/0bsn-hy,,ns ,+srhh :nug r. Assuming 100% efficiency, how many ampsh0 fnb s,us:,hgn /ry+,nnh-s 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 of a neon sign transformer prxsm fa et6v rz. s9/b./ute0k+ovides 7500 V at 10.0 mA. The primary coil operate9/. s vkb / zeexr0at+6tufms.s 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 its primary coil and 300 turns on its secig3wzqr56y+qzos b vwu k;/x86.b7os ondary coil. If 120 i 5ovkb7.zsw/buoqz6;yrsqx+w 6 g38 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its seconw9tn-- d-jmi v03dnx nb4 4t)beh;oh0fj 4mkrdary coil. If 120 V xt)wkjj4 o m enb0b4;03hrnf-nh9 mdivtd4- -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 transformeakx b*hz bqu 342vu f)8fpz2m*r has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, w*f4pqbbxh 2mu f z28zuk)3v*ae 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 20x g(.fb:4lc)datq 6 u+ w4lpyq0 turns. If the input voltage to the primary is 100 V, we can expect the output v 4 ltp6( uq+)4.flbqdgacxy:woltage 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 a2+atap.c cr g0nd its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the seconpatg 0.c2 ra+cdary 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 usulhlg w eljm7p88jh5- qv rj.g7w k944aally stepped up to 4500 V by a transformerg8jlgj87h jv45.lkw7wlq pm9 erh-4a and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at v, m 8ll,0iucr 2sed5v120 V. The voltage is usually stepped up to 4500 V by a transformer and tra520eumvrcds l lv,i8,nsmitted 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 voltf bg9vfkk/7 v8age is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmiss fb97 vv/k8kfgion line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km lonc284rt0 o wkzgg 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 ifc rzog2wk80t4 the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A f4 tizo-zz315a 9e waorxy; 5igenerator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage axii 4tf5w a er;oz-53zz1oy9is 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 transmittev5cecy4*y alu-r6e-f dew9 2 qd down a 6-W line at 1000 V. How much less power would be lost if the power were transleca2v u4r yqw5 -c96ey-edf*mitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitteu,ep*c z,tocpce) 9q )d on a line with resistance of 0.609 t)oczuecq pe)p*, ,c W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy70:l c u0hm dnz; hdb;w7f( ,ivlqn8dx is stored in the coil's d nh;(h7 : 0l78;cnqix,mfz dw0lbuvdmagnetic 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 resistor and an 18-H inductor. Whaw3cuuqa ics -a2mnozm3*8gys- p m7-6 t is this cir -37q6ic*wsu-nz 2-8smapymgo3cmuacuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage isrqp,qdl)ja:.2u r3 bc d0k 1co 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 curr,6ko0m;*b cd dtzhr. cent?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance n*i y.0n0zvmasl s /7hof the lasaszym /0i*7vl nh0 .nmp?

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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 pok x3m1bn3g,nf 4rf ju/wer supply. What is the peak current 33b jung4x nfmfr, k1/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 to a 120-V ac power supply. What jt ic22gb 9ec;i3tmr -zic d2ur,vo9(is the power dissip ijic 9im9et;zcc 2u3v r,(to2dgr2b-ated in 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 resisti wd0qi b w4w01(svq7kor 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 re nq:c29gf*nmsbn: :cjsistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50ilve 37ii tdye8- d,8b-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 m gt)v5b,wn; 46rdzeq 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 reacta*63af 8ukca1ur)x +pmna dwu-/ mwh. unce 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 db*;v rbgbr:u 0lkv* :a 14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of indiw n .9p/qe3yaj pg;3 9uktqx1uctive 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 inducto;qqyic/-w+4n ,keuvf r when 120 V AC at a frequency of 20 kHz is applied to i k-weqnqyi,;/+fv4u ct?

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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 throuw uv f4 l;xi1.sgrmym7(a .r/rgh a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive react o3kn-*6aa x p0aff/qc(iw ap8ance 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 to l5 cnyir5aq g)bi*3( 8dqgo v6have 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 capacitor have a xn;n +lfelyd. lg,ze6q 6qioo52hn9 5reactance 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- taw;jwwv82 5lmF capacitor be 100 Wa5w j2;tlw v8w?

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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 capbt pa5ef/3 m/oacitor 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 serij cvk;qoe*e/nw3,d9e.uvj *;j lhi4les circuit with 12.0 W resistance, 15.0 W inductive reactance,w/ ecldljj.;j vh,;9e4i*vqk u oe3*n 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 imp tk9 ucx 950nhkf(+ mtgs);wkjedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor akwf)t5gnm k9 9u(s t;h kx0c+jre 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-W resistor, 20-mH cokt r03-w nrnonsk;fkn+ f) n: 78lksg-il, and 1.0-mF capacitor atn) n +8os gwlkskn - :nr-nr0kk3ff;7re connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 2 )lm2 aq6esqd uh370hv1/unk a0-mH inductor, what is the impedance at 1000hk76as uhe01/qu v3qlam n)2d 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 ioy3ry* jmo)7o nductor, what is the ph 7*jm ooy)3royase angle 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 ne: i 1qx2ucs0umeded in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 2cu0u1m :s ixqHz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed +5b5qsic hf)l(hfvg8 in series with a 100-W resistor and 15-mH co )lbh s5vqh(cf85if +gil to get a total impedance 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 putkj 0 t0pmbq+:s+q 8ojxy6o;8ii skm5w in series with a 450-mH inductor at 5000 Hz for a total impe0 i op: wmxy j+0qoqi;tbs88js+k6k5mdance 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 ( 5r jdoa4ral eczr:a6j7rf tr.u1r( (series with a 100-kW resistor at 1.0-MHz for a total impedance ocata7(r1r6e:rrd zlrj(j f5o 4a(r.uf 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 conneculr+/u r w8qbx/l n j49ixe/l(ted in series with a 20-mF capacitor. What is the impedance atx lxn/9qi( ew/ l+j/r4rlu8ub 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 avbt1:ept0 x j*1k;kqv 10-mF capacitor at 1.0 kHz for a total impedance of 45 ;pj k:1t 10vbkvx *tqeW?

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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 1.01zmwy uwife5,3+u 0ym* z)g0aznlji+ kHz for a phase angle ofn*jli0g+ yy+m z)f wu 1zie3mwu,5za0 $40^{\circ}$?

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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 1.2y x53 .bfqc: ko,dgr 8y2lv2b nqmbn(0 kHz for a total impedance of 45 n.k(m yxro5 fqbg :n3qc2 28,lb2d ybvW?

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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 is ti 3;: ety8z) upis2r8kc9 uisohe phas;rup2 oc38ske )8izui t9:siy e angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz g*s9d-x/vna2rm(a t c if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are cdcrx*/amnas(vg 9 t2-onnected 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 wuq1 m0,wvo22z;/ vyjcddi1hb00 lkxconsists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inducw2cv/bdd02,u zy00kvi1l w q1xhm j;o tor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive r 36ty65.ozkrghm nuh1 eactance 30 W, and an inductor o ounmkgz5136. th6ryh f inductive reactance 30 W are connected in series to a 110-V, 60-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 reg*n ,c osh6zlr5y;i, v 39m1aig6mmuysistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power s3mln 1mi,g9,gm6csoy6*ir 5uv ha zy;upply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase angle b,i) nwz n(d8bof,b()zi bnd8nw $40^{\circ}$ 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 = 2a ew -* zff:lc-hb qjtp3+t*:t0.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving s*hte*fp q f:at --lzc:jtb3+wource?

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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 ixo87rlh 3vwf)f t- yx8n an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactan) f 8xx83htfr-lwyov7ce, 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 circuirei- +o5mkag2 t is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and j;y;x3mo9 2njhel d6ga resistance of 30 W. What is the pjoy d ;jg3 ehnm2lx69;ower 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 se7ud5yh7n d8mw1 oxeai6pbk9t3+ rl )eries RLC circuit containing a 50-W resistor, a 10-m 1l75m6arded)8y hwe b7k o9p+ux3i tnF 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 frefs swflay 1dy85c (xgv3d*66tquency of a 1.0-mF capacitor and a 15-mH coil in series?8*l5 g1fc66 wv td(yssyx3f da

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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 fora wi+5 by3lte5 q62rm x:)ksib a resonant frequency of 10 kHzwrl2ka be) sqi5mb5: i +yx36t?

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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 3.0lhei4dh 8 dfe- w6fngx)e; q:7-mH inductor for a resonant frequency of 1d;e4l)ei 0 6 xgd:whq8-fehnf 000 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 resistor and a 4 tss(q-/qn,*pgeqencex8 . ila* p3,t0-mH coil if the repsx ge- n.ncqq q(a/,*8t *lipes 3t,esonant frequency of the circuit is to be 1000 Hz?

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