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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of maj2xom3y) p8ah gnetic 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 st-hzkp24+ 0pm:bipp7oqn3 l etates 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 producg clqt j g ix/n.(n:-bd12ye4o0k yo:kes what kind of change on the indte:okgni 0kld 1 qyb:xng ycoj-(/.24uced $emf$, 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 magnet+rz q7 ciay37tic field through a loop of wire produces what kind of change on the induced7c+aqiz t3 yr7 $emf$, 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 kind of csg252 bhu0rp fhange on the induced frp25gbhu 20s $emf$, 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 arvi5pivf6/ sxq1m(0t yna(l )jlwm4 9 magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a cz 0mf7q9r+e-vp3s,atf mnv /conductor will be that which tends to produce which of the following efvtc3rzspm9 vf+mq 7n-0,e a/f fects?

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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 fla-t z rn46w,28o0f(/wumaqs)nzy ops it on a horizontal table. A bar magnet is held above its center with its north pole pointwa6r in4(0ustwo-,2qsp8)z f mzno y /ing down. 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 horizontal3ie .p;v 2 or9ym4/,jfecorj u table. A bar magnet is held above its cen;uy/32 mo9 jfeov.je4 r,rpic ter with its 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 0-ziiaj er*9q top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed fro e*ijiqa9-z r0m 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 magn fx 06pjm47bqhetic field vector points straight up. The mag46 b0jpfm 7hxqnetic 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 qmzz g4cm8 dh0t2v1 op .1*dova horizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced currogzm pt d .8z1vd 4q20mvho1c*ent 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-increa,fxt2 f b+ds*0g tsh1:kf7hxwsing current northward. Two coils of wire lie flat on the table, one on either sidefxx+bfh0*7tdgk w1: fs h,ts2 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 thrc bdaazh t0d-( .eg;/e north pole entering first. As the north pole enters the wire, the induced current will be (;(bar0deh zdc/-. tgaas 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 04 biqlt; 8xcl jrz/k3constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, wh0ltki38l ;jrcqzb x4/at 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 aboutkcl2 pah+;qwdau*: ,ea3ym 2u an axis whose direction can be varied. In a region where a uniform magnetic am+2 k,ul qy;:eda2pc *w auh3field 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.6+imeyj(v.y s
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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 thatywn*5/f8(foegg f1 cv an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. Thrh)wm tjkp4p9 vj9(m-r(cffs)-r1rye $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is af2 t4knx2pffkndki1 6:3ih* hi a(-nmoved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the phipik 2fktfhi(4:*f6ak x2an3nn-d 1otential 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 c9z r2ukc .v:abguu q+ptpm3.. onstant 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 tra;w;jnw3 /.xyis r c:quyrh *3lnsforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rot 19z cx3 vdy.oek:p.x5bnaz0tates through 60 revolutions each second. The frequency of thzktx b v.9y 0 c13:5ax.doepzne $emf$ 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 usey2h b0x8zuc 2r5 asb2kfbcn.: d 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 devi1im 5arl2f+otplxu. -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 +01d0z lnx :4frslem do 16jq8wsm2vc the secondary coil contains more loops than the primary coilm mxl8qjsoc1der 0vzl04sf:6 w 1nd2 + 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 primbcnzg;( cc9(2qjx7 q qary coil contains more loops than the secondary coil then it ixcc(qg(n ;9bc2 zqj7q s 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 lx-* .bdbzyp3 g0j.iipower 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 resonan3r .omm9-/hjre- jxybt 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 connecte*vy qk)+b2s 1quyv0jud in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage uu2qbqj+yk10 s v *vy)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 ,azfy fle*zclwu q ((b)gm80* an ideal battery of constant terminal voltage. At the moment contact is made wim)zyg (wbfz (lea80c ,qu*fl* th 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 7k c boh (z c:,g*.b.3jbdpkwv+ til/c a05znrR 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 resi4+4+1 axn nx(fxl9vetdxje0 wfsx2vu w:r w82stance 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 connectjugqd )rt)b*2 ed in series to a battery. The time constant for th)tbu *q2rjg d)e 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 in5 s()2zuuogoy1eq n8hductor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time ou n8zghyes2uq o(51) 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 sameq (*;o5hf8 rrjjq*jlk units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the curren, 1/i qekfj+(3w wpudkt

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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. Injhs 8:gyef 7.cic**xa this circuit, the currentsxcf 8hy*c7*i:a.gej

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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 ci 9wbbfr(qprp/19,dr cx6- reprcuit changes by what factor when the frequency is trif r/, xcpe9b(6rbr 9pqp-rd1 wpled?

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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 inductivbc5z, lbn ;ox83z7gxoe reactance of that inductor o;x5,x8zo3z cb bg7nl

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, the 2m4j .q v2 u6pvn g1h8 kfxfbrx(xll3:inductive reactance :.lk6q4hm vnx 1 3f(vfxb rljug2p2x8of 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 circuit, the curre;zb0dj 0yijykma3+p 4nt4mj0y+3 zk jaipyd0;b

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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 k q8jnnat7sjez9mw; 9e *dg+1an ac circuit changes by what factor when the frequency is tr9j +twjds*zmag87;q 1knn e9eipled?

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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 A yv3s.(wm0*ybce8 tk fC voltage across a capacitor approaches zero, the capacitive reactance of that capacikef(0* s8btm.vyw c3y 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 angldnz* 6 s7e*msze between the voltages of the inductor and capacitor in a RLC serie *m7sendzsz*6s 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 def0 dio ka8idwyfwva4) oy: q2/(ined 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 circuig5nu7n)k ay8pa rg o h .2h)jr(hc+sv(t. The impedance of the circuit increases if R increases. When is this statement t.pvhur)o gc5) sh(na8k 7 a ry(nh2gj+rue?

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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 t 1rj;-zm t58w*aj v,xcah:zphhe 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. ii9 e.fz,k ,wbdlu*n j, 9.prk 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 series circuit, tks(1 qo q*bui9. jh7a6b:qkclhe resonant frequ:j9 .ku ai*1 cqhb6b7qolsk(qency 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 x.a7v+a4 9ej.c1zvk(wp wbwk an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs wcs/5 u, wm* ofegky8r,hen

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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 p nqj*9swea j(3 )ez2luniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fiela 9lne2*sw)z3pjq ej(d 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 a uniform magnetic fieldaxwt +:wrel9: of 0.20 T. Find the magnetic flux through the loop when the plane of the loop :a9lx:erwt +wand the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating b1j0rm39 u14g0qfpv npeq))bd +lqgg in a uniform magnetic field of 0.20 T. Find the mab30dbpq m1q4v gng+) u1jre q0glfp)9gnetic 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 an adjustable single loop is 1km glrtai -v7q z;31oi fbhr+,t:fo0 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 uc*y /hfhys*v+:.e8lyigt y9 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 framekv ed 8 )(ba3rysu9ih/ with sides 18 cm. A uniform magnetic fyka s9hiur/e 3)(8dvb ield is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the 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 a)+s5 xz6obbym z3fd r4n 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 ps(elm;gij5yb8 ;w q ,$0.20 \; m^{2}$ 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 mq86 ud 8tkzkicnh176 q flies horizontally at a location where the downward componentqdn8k1 6czk786 thqui of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angya7z8c d8zcka: ek9 p+r;qs.ojrl.n:ular velocityc +s: 88: z rqrazkeadkp. cl;o7nyj9. of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-secti yiqv0cagy2k 5k67qa/mp-z3vonal area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire spwq1fkool9peuy72 - +6 .rfcof 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 z )vp6q+uh)izqg:z m .80 rectangular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axisz ) ivm+q:zh. g)6qpuz 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 e ;ih mh lg,p54mme3rgdrb)-jv6iq*)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 construcgk )g/.uyt99kair d8ofa6a ;vt a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If thud8i vrg)/kk;fg9at y. a6a9oe 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 generk7oks/gdrmx 0v6)3qsae:8p5 jq r -hyator 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 W. The mots,bvfht8utpq.,w l/e fh1.-e or 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 operat8a,dnv0ocwfi v ;ax49 o;9 qrces on 120 V AC, an;w9 cdofcn,q0vx 9r 4ava io;8d 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 cou i;s o*nq:8mjraz92q;aj z0mnnected to a 24-V power supply. The operating current is 1.0 A. What :jaq;* rzi0j n2uom8mas9;zq is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V powerp+,lmza lr 72e supply. The operating curre2ml z+7la,pre nt is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply.gm0bwz ,5vv7),enh qt The operating current is 1.0 A at full speed., wgb,vt vheq7)0 5znm 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 tonwb9i 6zebs/+ -yy*s aw j,no i-7kqtz2 r:p+f 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 t9ktyfs i; sfnfkpj1s 7d:)21go flow in the secondary. How kt:sjys2dg)1p9f 7fi1 k;f s nmany turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if th-8c2jukg+nzx;f) (hg ze)d7uuvzo 4p e 24-V sefdn) zoz+8)hceuvgu;g(4k xj2 7 -p zucondary 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 sec3ug xlbl 3r;tz*fe5k)+h8bn 9nf jg a-ondary coil. If the current in the secondary is 3.0 A, what is the current in the prim8ngr n klz9exfj-*a3 u3f);5ht +bbglary?

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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 off74t*u ,vam (9dqsklpq/ myftgy :7v7 a transformer. Assuming 100% efficiency, how many amps at 2d/,9q :f l 7f77v*y(tt vpmmuykasqg4 4 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:/etu5 qp,non-i9bf x9 xiuo;.0 mA. The primary coil operatesnb/-i xi95uq: o,pf9x;ne tou 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 seconw* hbmv7-mq l3 ,-btmzdary coil. If 120 V at 2 tmhm7bvwlz mb3,- q*-.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 transformerlf qa8w/ ,t1w vu-rg:q has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in t /8tfagqw:1vw-,lqur he 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 acg(eock8 ) 7jld*kxkd,-tmb (g pu*z(nd its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current aujp ,*tockxeck*g) -gz 7d( ld(kbm8(t 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 h52if2j d:/bcaed kan ;as 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage ofai5dfc2abk d; je:n/2 the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 2h;9v nb(ru9mf 4h8u fe( eeo6z00 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frh 9; (femhe8rez4u fn6vb9(uo ictional 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 cuat-c /zn*hs 8rrrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted ts znac-rh /t*8hrough 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 of4:x w)rm1mrmg z0nhzz ,fov-2 current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and-wn4 0g2,r r:zxm oz1fmz )vhm transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steppedn/l u ecose.,; up to 4500 V by a transformer an ,/e.clnus e;od transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped 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 lrqsiyooi +: h48g(q9e ine 50 km long has a total resistance of 0.60 W. A generator produces 100 Vioo(+8gheqsy 4r: i9 q 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 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 resickw:x)4kx)o uc;sk g/stance 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 transformer is used?x:)) cku/4og; wxk ksc

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much lesehly ;z;w;p, ms power would be lost if the powew;;,y ;phelm zr were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on ahfyn,2d )) ml8 cy7mrx line with resistance of 0.60 W. To what voltage must the generator output be 2fdnmm )8y cx7)r,hylstepped 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 energy is storedbadx a t8u0c0 s9)tbj, in the coil's magnetstb0j cu)aa0xd 89,tb ic 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 containsi +tocdtz1n-gnrl* :90 m 5kup a 6.0-W resistor and an 18-H inductor. What is this circ5nm:iol*g tz+ 9t unp-0dck1ruit'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 120ba ffe1:yj)oy 9 61xcji,ke,3u-dh fu 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 ieob 8)1l cdei+s 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 of thr6vx6o;phbsk7.:yk m e la k;k6:xyhpr.s 6omv b7mp?

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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 powdm 7r)*fzwbdxi6o91w: ex) uv er supply. What is the peak current through the resi)zide)ox: b w mv6 ud97*wf1rxstor?

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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 4f ta qu v6(siw.2ft3opower supply. What is the power dissipated in the r4qa(3 f2 fwt uv6.ostiesistor?

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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 is1x- a4a;ny zfi-wq dz8 $I = 0.80 \sin (240 t)$. 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 rvymzh)ri1vuv2o- 3x *esistor 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 50-W fr7es6ts9o4t6k )g sz 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-mHv pmth9w7r(5nq eh 8).,eiuui inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 10y-+p9wa c1pnnweh4(;. ( d7nmrvwnz 5vlnj 3m00 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductib*jln6 x +go6) jyj9z0 fpye-cve 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 reactance at 10yll 53imp- k1f00 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)r6x dzjst 5f)r when 120 V AC at a frequency of 20 kHz is applied to d) 5fxtszr)j 6it?

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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 )xxr (duj ;a5o110-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 10 2u 9hc,h/plvhj w5no2 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 cak da)bwf47kk 7pacitive 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 reactance of 1200 w0vchs7i8w ics ff6 *(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 th*m /ma6 7hwvpbrx9*the capacitive reactance of a 0.010-mF capacitor be 100 W6p*m/hv*tr b97awh x m?

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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 :cc x.yx0 up:e4j tria ; 6/ap)ueep3sand 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 fga+dqp 3zws v1h.2*m series circuit with 12.0 W resistance, 15.0 W inducti wv+p 3.z gh1*qsfdam2ve reactance, 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 resistor, 20-mH coil, and 1.0-q*+j4f4h22qrq vu a.u js 9ugbmF capacitor are conn *qqs+bqhugaj49 ru.v42 2jufected 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 resislz(8e)a-k;j p7.z. h nbt lhbttor, 20-mH coil, and 1.0-mF capacitor are connected in serienh .pt).7z za8;(e -blbkj lths?

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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 ind2 (1 fo6f e7te1bxglvxuctor, what is the impedance at x2fvoxf(tb elg1 16e71000 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 w i ;ct9o*xq/icith a 20-mH inductor, what is the phase*c9/tc ii;q xo 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 1.0-mF capac,ja niny ol(24itor for a total impedance of 100 W a(,n2ijoayln 4t 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 capacitances is nqb;vqrejv*:/z q9.kf eeded in series with a 100-W resistor and 15-mH coil to get a total impedance of/ze f *kqvrvb:j;q.9q 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 inc vbineh/5:9hductor at 5000 Hz for a total impedance of 40005n:/h9 c bhvie0 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for a t-mhfk pwxby;yxv- 22zj 83 k/1k8vabzotal impedance of 18 / -pabfkkz8wy;jbkhmx 3vv21 -zy 2x50 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- yvb 9bq:e94snmF capacitor. What is the impedance at 1000 Hze:b9yqb4 s vn9?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is n ofn zz:ao67ip29gfo) eeded in series with a 10-mF capacitor at 1.0 kHz for a total impedance ofizp o:n2 6 7zfofog)a9 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1geow, szb /) eil*.b5k.0 kHz for a phase a.e )*li zs/owbkb5e,g ngle 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 ax,d8mo4kb8fhv s3o *s total impedm38 * 4,o8xhfbsdoksv ance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. y, 1*pi :d 0wf6pkl,4sugpyhh What is the phaseygp yf1,0isld4 pwhh6u:k p ,* 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 if a 100-W resw57y*wm., viw3 l2k al;.q:r azp*ded;jaj aeistor, 20-mH coil, and 1.0iv.lze7*aaqm a je .rwl;a 3dw;2wjp5d:*,ky-mF capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consim;7/*8hcd7 gjy map- f*n dfvlsts 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 t/m*jm y7 vdf8a nl*7-dfchpg ;he rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an indup.1.pprle l * 0) iynd:fz.dmbctor of inductive reactance 30 W are connected in seif.m.:d* pe)bnz.ypp l01l d rries 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 resistor, a j/xpfdbs8ikvl - 989sv.da*p10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz flp-8sx9 s d.v8ipa d*kbv j9/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-W resistor for a phase angle vlxq v /v,e:z)of v/)xqv:z, lve$40^{\circ}$ 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 Rga a( wz28gsaq1nap wk5y70p 5 = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power a2580sgz5pwyanaag 1k(wp7q 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 ciiofo42b vdep8n y7 9.qrcuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, yq.p9o f 4bon8v7i 2edwhen 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 circtw)60alm5p 6zd gx+ q .z7xiimuit 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 a resistance6 xt5fo:ovu ;n of 30 W. What is the power factouf; 6:xvoo5tnr?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containinohmb shw(8l1dv2.( ucg a 50-W resistor, a 10-mF capacitor, and a 0.45-olwd(m(.u1vh 8bsch2 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 afcit8q+qy*aoamp047 2v t p7k 1.0-mF capacitor and a 15-mH coil in series?fp74ky8q2tt* 0ma ai c7pov q+

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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 4t6uzl feqxb,;fhn02w3g cx 5 /.7-mF capacitor for a resonant frequency of 10 kH,u36cbt/ fxfg5hwx ze2q0n l;z?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is 0+yu d06m6fzof6 x emlneeded in series with a 3.7-mH inductor for a resonant frequency of 10006 eo06f 6lmmyuxf dz+0 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 ud e2mw q:rc,rhtf/1/series with a 30-W resistor and a 40-mH coil if tfq/ mrhretdc21w:/u , he resonant frequency of the circuit is to be 1000 Hz?

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