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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 of magnetic flux cjkoc 6lqx- ,+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 inductz/hmg-h 6wnqk 7ksm 62ion 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 a coil produces what kine pfhi-.wn3p 6/ yxz,xd of change on the i3ewziy- 6nx .,hx/ppfnduced $emf$, 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 mag*/rfra7xdg f-+nw 2bjnetic field through a loop of wire produces what kind arxd2gf-*nb+ / wf7jrof change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop ofgoy fh/6rpu7p-pe.m7 wire produces what kind of change on the induced7 e pp-7up yhgm/.of6r $emf$, 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 fiv r5qxqet;5b4k ua/g4eld an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductor wilq.dwxi,*x,p t+1sra*wz yq r+ l be that which tends to prod.xapsz+t *wi1qdy*,rw ,xr q+uce 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 hxyrk(/dt+ my d 97zg-meld above its center with its north pole pointing down. The stationary magnet inducesym /+t7z9gr -dm (dxyk (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held ajja0kacoq60/m +c gs0bove its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induc/c6j0agaoqmkc 0sj0+ es (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 regit dtp t39u rp3p0rb du6qazq,j ef-+:)on where the magnetic field vector points straight up. The magnetic field vanishes qp-eujt)uft06pqr3d b + 3pd ,ztra9: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 e*hmh f*.9onr0.jm8qo haf l7tor points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in .e0qmfjo*h9l8m on.fhrh a7* 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 magne.)wul- humpff/+1whe-il u0btic field points straight down. The magnetic field disappea.+ -pl1ulm ef0bh)fuiwh uw/-rs 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:ntwd4 ur-9osxi0b4b on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the ix bodu0 r tb49n-4:swinduced 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 throu*k:krrw enl5 *gh a loop of wire with the north pole entering first. As the north pole enters the *k:n rewl k5r*wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an i g7gi. sdx),laxis 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 rotation ifxs.d ,l7gii) g 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 witlpv,/s ca0kq8hjm(hi::w7 dm p 3dv2re is rotated at constant angular speed about an axis whose direction can be varied. In a regio8 dc:h,0(sqklp:wmi/ 2h3vdt7 vjm pan where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.ofd 50 ha:wcv-
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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 /uzr /cwv,-h)db /boran $emf$ 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 yldtcwdcz)5lbo/kt 88x94wy k, c+ t6 a 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 easdo sn 3:pqq :u +diiye*k)6pqj11;yrlt-west direction) is moved northward at constant velocity through a magnetic field that points straight down. +dro6*y1punl1 y 3ji:) qq:;kepqdsiMake 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 cons-2j 3syivr*tf tant 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 tpbe v+(/rtqw a, 3rje*ransforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotav/eo80zn dhthtc-tk -p/v4 ) ktes through 60 revolutions each second. The frequency of t h//4hkd -n8to 0epz-ktv)vct he $emf$ 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 dezp*vr ;mu .,uul45j uy)iao0lvice used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device thry ++3wk ng:flohd+fb0 y5a *cat

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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 secondar9 ygbpi ce ng; 5jlf4w)xu56u/y coil contains more loops than the primary coil6ejy c9lfgp gx5biu);4/ n 5uw then 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 more loops than the seconsc0(dc o e/t )ip(hiw.dary coil0hdceop. (i i/)tw(c s then 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 inputcag bi.eh/ z7,

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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 co jkj-;bj*ek.b(v5jcircuit,

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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 arh)/*0mqen fzje connected in series to an ideal battery of constant terminal voltage. At the moment contact is made withe j*zqh 0n)f/m 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 tf1 m75yu8f(x/iox7y z1/+amwnqd -;gr x gciro an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the v/if;7dxn-f 1wr7gy c a(m+581ozmr g yx/q xuioltage 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*sf7i ;abtc0 py:dp/ enductance 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 inductance L and resistance R is cjst ) zgt0by9c4plr/;+i gp 4lonnected 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 connectedlvzl22z 3lqqet*6e* j e;fz. tg ez81u in series to a battery. The time constant for tqllz*e;2g ezz ezett 8q12.u l3v*6 fjhe circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor areoviog49 : jpw, connected in series to a battery. The battery is suddenly reo9,4p wio vjg:moved 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 hril8v)mv nmqitd i8e0(4.veq (-pbqzb/(.xr ave the 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 powckak6; srxh4ru5di m q1*n56z9p8:tm jsm6ager supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connectedvng2 iu 1gd)h7 to an AC power supply. In this circuit, the currenv2 gh1i g7nu)dt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactanced z(aq9zm ru.b 0l5r(n in an ac circuit changes by what factor when the frequency is9uab0r (5(dz rmnzq.l 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, thegd6g 7t6( tshe inductive reactanc7dgest (6 6ghte 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 the6v3 eh y9pbr 11clu;7ysak;w x AC voltage across an inductor approaches zero, the inductive reactwp7y cx ;9vy6 a1;ek slbrhu31ance 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 swr:v3dv/d+lq 8uro0 k)a n(hcircuit, the currentlwnd uh/oqr 8v:0)s3av+ k dr(

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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 cet, l+s )v)cfnul n9p3ircuit changes by what factor when the frequencyfl,npcnue) 9 lt)3s+v 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 a zb9 x m,porin)bnhb1s h co,7k j**3zq+k6.becross a capacitor approaches zero, the capacitive reactance of that capacixio9 )1q h*+7e,ob63nb .z kjbhprs*mbnz ck,tor

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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 anq +qjf4 aq(4yjgle between the voltages of the inductor and capacitor in a RLC serq qja+(jf4qy4 ies 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 06j8itv s(kyd defined 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 :(xh gcf 16mqwo. ut0bincreases if R increases. When is th 6 u :qftbg.w(cm1xh0ois 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 ofzgv3x.u1tn d )3x 1wjf the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of t1thz96go1u4 e4ud o ihhe 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 series circuit, tr, v lrv615cg;,mwqn vhe resonant frequency ofmw, r g5;lnv1cvv,6rq 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 A8xl(gv1 ycq lp0mi2s /C 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 cn: wgdb g5 8*;wg+udiqircuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m ipe1 7i/4i4j7srbj mrks rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic jm4iis /p 7r7kr1 b4jefield 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 q )uq(m 6vdu5mcvjw1.0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector dv5vu. u 6(qq1wmcmj)are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform oj2r5ax 5lbbt 0hs:hb+n 8pb 3magnetic field of 0.20 T. Find the magnetic flux through the loop when thejo:sbn05 +lat2hbxpr3h5b 8b 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 an adjustabl 3fxbw8f.n /5ixkd(d ge 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 y0kv +x6z/;97pyib u llx;zvk$4.0 \times 10^{-5} \; Wb$ 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 sqkkw .ybu,x0 n67m mh7xuare frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly frh6 xu.0nmy7 k7m,bxkw om 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 wi :7ajk itbs;7exk:ac/th 15 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 a)i,fc w8vgi)g rea $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies uka /(vwbv*u 3x m9;6cdof*fv horizontally at a location where the downward component of the Eartf d/x*uwbv(aufok6 ;9 *m 3vvch's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant an7bka :77t(xqr 6xifkzrp 7 ig6gular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a coax77i 7if6 pktkq :r6z7rxg(bnstant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area65orzdqzhny*9 n (s(q 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 ofk-6 pizov,g*b;a80gg gjcx ,l 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 armatuggeh, zu k3h+bcfm6+: re. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long sideuhgc :kz hgf+6,3b+me. 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 of wire of area,4khd1ay:mxd d0d b2v $0.090 \; m^{2}$ 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 xekc3e4 m9j4 je/ y,wysimple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the areae ecj,k 4mjx9y3e4w y/ of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator 3 ix7qgfp(ox)sa u,5fwith 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 +z +oam smr0i7r1 6l t0g(dfrmof 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 resistance of 6.00 W. Th z *xi6s*bc4 -bs m1;fvpvg8whe motor operates on 120 V- zb p*f8w b1g6ss*vi4; hvcmx 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 to ;queuj4w que3)ioe19 a 24-V power supply. The ope4q1 ueuqu e; 9ewio3j)rating current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.07.ssv 9xgh if1 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What i .h7f sg19vxsis 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 ca,h2 b n)i tmfz *(axv-knc,4aw( qbg2onnected to a 24-V power supply. The operating current is 1.0 A at fulmbab 4 ,a(t,in*xh22q)ackf(g z-vwnl 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 m y4v(t u(a5:g5xv y wn8plkm9is 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 p rswqqu m1o(c1 yv8n:3rimary of a transformer causes 14 A to flow in the secondarw1n cm s1o8ruv (3q:yqy. 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 necqru.1 oy jh4c8y- 7:gf9wtjlxessary in a 110-V primary if the 24-V sec.749g: 18cty owlq ru hyxjjf-ondary 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 clh99/0 pvy7)x k4n lfhif+lyi5nmh0z oil. If the currenh4np) k/h0nhix5 fll0+ fzlvi79yym9 t in the secondary is 3.0 A, what 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. Assumiw6gqu2344 cu9ypp gl ang 100% efficiency, how many g 9plg2a3uc4u6p4wyq 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 of a neon sign transformer provides 7500 V at 10.0 mA. , h pyoyi*q:a1The primary coil operates on 120 V*qpo, i ahyy1:. 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 prineg5f--; 6yyjg+a oi imary coil and 300 turns on its secondary coil. If 120 V at 2.0 Ay-io;f6gjg ai+ 5-eyn 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 primary9 .une;07j prn.rocqt coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the prima n qrj.run;0o9c.ept7ry, 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 anibwmbth;o2 / )lgr1anc(w5j/9up ((mjs eph0 d its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at t9e gphr 0(j(/am nit/uo2 l5pjc w ()1mhbw;bshe 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 10js9+kwh )vz 1dak;sq 20 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, wvskdw ahj2 +z;)q9 ks1e 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 tra cg6z/qb1,as ,. vnkbinsformer has 100 turns and its secondary has 200 turns. If the power input to the primary is 1z, bv k,csq/n .6agi1b00 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 curren;qecens;8;rwg 9 lcr8 skp2*rt at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted9el;pwgqekc;*r 8ssc r2rn8; 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 120 V. The voltage is emlxs d)tzdgm/n e y1e a2;jt7m,8 0m;usually stepped up to 4500 V by a transformer and transmitted etn2 7yat d8m 0d) s/;ezmmx gmj1,el;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 ass. ve,(6839d7mjvcmkxm j 9 hbx7ra it 120 V. The 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 percen mvbxji.c j8a6 3m(es 7dkxm99 ,shv7rtage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resista xdu8g0*skai .nce 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 the transformk0ixs. audg 8*er 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 til utf yv/1bnm.8o, s7otal resistance of 0.60 W. A generator produces 100 V at 70 A. In ordm7u,lf.si/nyb v ot 81er 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 transmitted1xhgi5 d9bc9k.sfd e u y+5(wz down a 6-W line at 1000 V. How much less power would be lost if the power were transmit u.cebih s(kdz99xdg+5w1f5yted 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 transmitted on a linew vr x+.9ev5cd 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 0.010vvx.9rd +w 5ec% 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 a lf-x-wi-r7h;nsmf1 +t ,gdj of 5.0 A. How much energy is stored in the coil's magne 1htx-+rs-f,wding;jfm-a7 l tic 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-Ht7low+y f hjr a9ckf-gs68,p5 inductor. What is this c7f6,9ygoas+p5lwk rj-f h 8ctircuit'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 is 1b./1 ;ncg nhlq20 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 12 )6bol7qja fk0/ +6yno 25emsgdx /qgb0-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 is the resistance twx z*5( s4dd8u;m.cg clq 2t;er o*ibof the lamprt5bd2 x(lc oeq wd;i;**tg4.cu8zm s?

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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 powoackcg/d6 -dr+ow( z 4er supply. What is the peak currentw crkoogz c4(+6 add/- 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 sx1r1kfh; h 2deupply. What is the power dissipated in thf1r e; 1dxhhk2e 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 5 q t.+w2aa:f0g7frzlqj ,c q +ga,l o2r-teu*b0-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is i i(x*)bahv-mqox, ksg-3g- d$I = 0.80 \sin (240 t)$. 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 5w/1ci* alt8 ch0-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor a (i0uuhfi9rw6 t 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 reactg )c np+g,1m kqqj/rb.ance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W o-;qgrz y3t- cvf 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 inductive reac7aj hauu;. ysk,lh)b+tance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequenul/uk lupnd)b1oud6za,8i-/kxy +(lcy of 20 kHz is applied to)z/1 /du, p86 inkdll(xu yu klau+o-b 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 co-whst +i- xlj3 i)nar-dne42;9wv d xkil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at ut 1befio8/m2vz .d6 c10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of e owqd/q,r;c b5 nz18m0l6 nblcapacitive 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 react iw oifdee;io9 +bsu26)07oboance 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 t, dba4d66owfthe capacitive reactance of a 0.010-mF capacitor be 100 W a,b46do 6twdf?

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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-mFtbz j;0 . q v.-c/(ysacwo:dmu 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 r ceux,t,:x j8cesistance, 15.0 W inductive reactance, and 10.0 W capacitive reactancc:j,cext u8 ,xe?

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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 15d extaqw28 5:v00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connecteddev:2 x5wa t8q 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 coil, and 1.0-p 2xpq vvin6m zh/w5r0k (m:o0mF capacitor are connected in se 0 m /0hzxp2qv irk(:wnmvp56ories?

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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 l)+ sel 2uz- rbvu)m7 (wep4enwith a 20-mH inductor, what is the impedance at 1000 - we+v7nr2eul)ep(s 4m b) ulzHz?

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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 connectzr0a5 uegv23ped in series with a 20-mH inductor, what is the phas 5evuz 0g32apre 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 needed in a series circuit with a 20-mH coil and c:i:ihguq;f 1xh4p t71.0-mF capacitor for a total gx1;t:uhp ci74iqfh:impedance 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 capacitannwq4 e4 kt4tnm 8b+klmk5x8 8ices is needed in series with a 100-W resistor and 15-mH coil to get a total l5 wbt4 nm8k kqnt8+ik844xme 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 put in series with a 450-mH inductor at 5000b-(bo)gkkj;ju3sxim,0xd1u 3-q rg8 jel pi3 Hz for a total impedance of 40000 W?ojdkb bsu(3i rlg,;k-1pxu3x03gm8jqe)i -j

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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 se2mgp.vcncn+y9o 6f s3ries with a 100-kW resistor at 1.0-MHz for a totac 9pc y.2no 3fn6+svmgl impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mFpz3t ).:nub(k gy6 (iks swlgr6qhl5; capacitor. What is the impedance at 100tyhb6 (nws sg :uqkg;l3pi. kz)r65(l 0 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 k7t licy1w;cw 0tgn 3,series with a 10-mF capacitor at 1.0 kHz for a total impet3cl0g7 ,ny wikt1cw; dance 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 xuiyk2:o, ghc1mz7*y series with a 10-mF capacitor at 1.0 kHz for a phase angm1y 2*zx y k7:ouhgic,le 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;jdlziz ,f.(tdax 34 h kHz for a total impe(4 z .lfixzda3d ;tj,hdance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a u:c*ersgsq)wnn, j- ; 100-mF capacitor at 120 Hz. What is the phase asc;jqns)wru: g ne *,-ngle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH 1 p lwutmv3m7(coil, and 1.0-mF capacitor ar( vpmlt713mu we 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 circuitvq0 s+vri 27zr consists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms0 +r2qv7z rvsi 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 W, andublcisxn wx2(- 6g3i-k7zxev0 j0 ,hj an inductor of inductive reactance 30 W a-v xik 00jxu-b sng(,iej6c 3xz27hwlre 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 R yekd(v0; 1 whas0kqi:LC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.; svh(d010k qiw:ek ya45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-trpfpvjiq1)) 8kh ,x/2 py oi;W resistor for a phase angle of p )jq,pph1v)io/rxkty28 f; i$40^{\circ}$ 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 = 4 lp)w *9pgwem o5wh2w5vzwh :20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have *gh2we pz45:w9wvhlmp5 )w wo maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resista eo6ap)r*4 :umxbvvjfq, ,)j pnce, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is co v,m :xj)q v4pe ru6pofj)b,a*nnected 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 circ3k uba8ydd76si. 6fp; lds4sr uit 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 60mi :erm.*:qcpi r)hi8 W and a resistance of 30 W. What is the power factor? *mq8r.p:hm :icei )ri

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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 f;zikad +w/-ke crw786mvoj) 9: xt iksor a series RLC circuit containing a 50-W resistor, a 10-mF cap;m-)vkksxktw7 z/erja 9 +ico i68:wdacitor, 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 frequ rtmhn;4 yyj(yja/ xpv. q 81p:lf(on5ency of a 1.0-mF capacitor and a 15-mH coil in series?nj p(/lqyn ymv;hj 8t1 :5y(a ox.pr4f

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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-;tugh41 iz e7 nnmy:(vmF capacitor for a resonant frequency of 1u mnn4ezg;1th7vi: y(0 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 3jhd4nz8squ39+fuwz(t96jw :dd ri ) ;2ou dtq .7-mH inductor for a resonant frequency of 1006 w fq+ j t8dh) 4;ouzs3i2dztndjr 9u9uq(w:d0 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 axtk;3o t0hb8resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 H 03;8 tbahktoxz?

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