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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,7k8bvfm.j e20y3r xsujf+/ 2wmcl yj magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction koj,eeo9 ,i:qp inp 4)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 producesto+knpv i9/.p what kind of change on the induc9pkiv/t. opn +ed $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire .oudqk7a, dh 9k0s8sm produces what kind of changhs8o.dqk7 uad , 9ks0me on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produ x ad4e68zbr7rces what kind of change on the induce8rabe4 d67r xzd $emf$, 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 magnetie,d0m rmxj4 ec/ pqlgm+i +15rc 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 conductwjtz:t;pfmzj /,+w6f -7 wqz bor will be that which tends to produce which of t;:fw j7+zptzw/mqwtf6 -jzb ,he 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 above itrk9k se-y 1-pdgpli(7pz7 :mp s center with its north pole pointing down. The stationary magnet induces (when viewed fro k7eyi pp(k:ld19--rpsmgp7zm 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 4rwwlux r(:z)ddf + g8held above its center wituwd(4+ d)rfgr l :w8xzh 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 top in u/ccon5 f9m/yd7bk) j w3w5 mma region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of d5n7mwy uwf)o/jcc3 km9 m/ 5bthe 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 wher 2vpm92xlr5 v8qr)kgxy7a 1iwe the magnetic field vector points 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 lim g1xyax2k)v w qr79 8rpv52increases?

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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 t-vb: na7zwra3op in a region where the magnetic field points straight downvz3-7ba:n rwa. The 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++ie n;c kzuk4 lies 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 induced ceuni 4c +kz+;kurrent 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 wqoev60 us; 0kxe cfq+6ire with the north pole entering first. As the north poqo6f06c0+ kv;seuq xele enters the 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 angularsfmvx9z: l n7wb89;g o*9w gby speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the *:sw7 nz ybfvg89omx9;b9lw gorientation 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 angulau7mpqlx mbbe0:l870,ogfag+ r speed about an axis whose direction can be varied. In a region where a uniform magnetic field poin +7mp80 abl, x elg:fugqmb0o7ts 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.fgn;b(h +q5ee 7t(;b engtb2 a
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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 acxv;a 1ve5rb1ktgx3*j3 . ngyn $emf$ 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 anm5dyt + 1t5ysy- le7p 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-wessk.x j1i 6g3wcj.cp :bt direction) is moved northward at constant velocity through a magnetic field that. jwx.pc:g1s 3c6 jikb 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 rot/ycd ry2uotg1+7 ubj+ ates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transf8gvp z, xilej0axx2krtoc6;nk .)8l ,orms

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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 revoluti ule5b2fk0nq. ons each second. The frequency of tnl2u0k f5.beqhe $emf$ 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 devqacv8hz xco9r6 zc0:d 2f+sfti, . n3yice 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 du(9 9tzr/+ p oxlhuw2vevice 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 secondx+s(tbj:bwd70 l71gqb y ,k+ arvfd)c ary coil contains more loops than the primary coil l(sqd1+xk:f tbjay+bv r0,77cdb )wg 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 tha0aq6 xa+ fwhr9 d(m/fjn the secondary coil then 9af+x fdrq0( aj m/hw6it 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 sngfhzsllyl4fsr :u *., 48n8power 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 resona1/6 uaf-sl slynt 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 connected in series to an ideal battery of cuviiq u : oi9zyq)(,7nonstant termina7voi n)uqqz ,i:iyu9(l voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an indutg8/saqx2 r q5 :y4eq()ljh bnctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acrossgjnt h2q( /b 4:rqq5)xa8ysle 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 inductancer*ln85ck; 9ye jwd v9q 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 nvf+ oh3w,47v +blgfswith inductance 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 sehu0i x8f)*rjfc4ayr ap+ca( .ries to a battery. The time constant for the circuit represents the time required for the current)y 0uxra +j4(chcraf.a *8p fi 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 are connected in ulsho16-ad3r g +ji 8qseries to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time 6lah srg1uo8+d 3-jiqrequired 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 sa.r8r,utryhpw b1 s *h4gif;)((mz ixime 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 posfrwm.ain)* p 9*wgb 9wer 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 connected to an AC power supply. In this circ1 cp fe/ulb+/cuit, the currenel+u fbc// p1ct

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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 qxlq5 :f/xij 0circuit changes by what factor when the frequency is tripllq:5qfxx /i 0jed?

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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 vdd ft.lozxm) 5 5(pbfi;oo3 2loltage across an inductor is doubled, the inductive reac2d)m3fp55 oizol; .ot( xfldb tance 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 the AC voltage across an inductor approaches zero, the i)raq :;zu(fneqh 1e5kghn chp4/nd5 +nducti5 4q5)f zhk/ (+neneughaq:crh1 np;d ve 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 thi ldf0n hggq1( b-i3;ius circuit, the currefg b 30higin(-qul;d 1nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactb0pb3e; wx4ixance in an ac circuit changes by what factor when the frequency is trbe 30pb4 iwx;xipled?

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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 ,4pd4( s f n0aj+e7x149jigl ztfqlxsvoltage across a capacitor approaches zero, the capacitive reactance of that capacitodif 9g14slal+p(4x0nzft x e q74js ,jr

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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 i03kpg; ujiz2l 50xu aqn a RLCpuli00kzg5u q3;aj 2 x series 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 defined +1pc exld79 yzzv4+p,2 kliya 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 increa:h *ls .k,mekrses if R increases. When lkk:hem ,r*.s 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 cr-xp/en z0lt332m ic 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 ck i8+6qi ;,gbtxmny7lircuit. 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 capacitaw ( qvfq)pc:)og cm2y/nce both double in an LRC series circuit, the resonant frequency of that circuit :qq(fp 2 c/gwo)y vmc)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 islro9b oz38t u7 driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs whetm5d t(80 z*,kfy h6 1rxwuqdtn

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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 rotaj2much* a b.u)ting 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 cmuj.*ab) uh2 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 rotatinbr:ft:osi y5g;r bp(7s,)wvy g 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 are perpendicu vs57wo)(p:yyfbit,gr b;sr :lar.

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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 rota3mldh 4tjk3 m*ting in a uniform magnetic field of 0.20 T. Find the magnetic fluk j*3t4 mdhm3lx 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 m va9a s6d2n9qof an 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 fr19os6v :p 4 wsjvt(px oexm((eom $4.0 \times 10^{-5} \; Wb$ 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 frame1lu(*ol.ud2lw/pn rs with sides 18 cm. A uniform magnetic 1dl2* lw( unr l.ou/psfield 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 1q7wbtyn -z xrp4-wh1n 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 are*kfvj og/w0t5ol) .bua $0.20 \; m^{2}$ 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 horizontally at a location where th:vwc9, b th2wdzjtvn 6q6j,da6o n(a3e d3n dttcj 6q:jaz 9vwo a2w,nh(6v,b d6ownward 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 bat; -pycw -nc 4dntmhk64ch2 m,r that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a d--nhmwn ,p tcmc642t hy4k;cvertical 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-sectionavq2,qe2fp d*;cb(:+ iwuziool 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 of area . ws+yt/m8xjj$0.090 \; m^{2}$ 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 rectangulklo4 i2dxfoe a 2/kh73fid3q- ar 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 sxo3-4 k dfaikdh lq227iof3e/ide. 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 1(y1ckzmb)m5 8p+tjxnj -l dt500 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 current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an outpuj68i. s; p o9jpdddfvb27xzp+go 7iu+ t of 12 V maximum when rotated at 60 Hz. A magnetic field ob 7zio jvo9p;g7du 2 p8f+xdp+i6 sjd.f 0.050 T is available. 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 generator wi fbi4zxcg/ ypsd2 5/-zc4 x6rtth 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 has (iv;)ld-jojns ex)e)p 18llue0 p/v ve 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 resistance of 6.00 W(9h+qwn3glu;oll ab 5. The motor operates on 120 V AC, and when running at full on (u h9gb3 lwq+l5la;speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suppl/v ufb5gh:i,j0wkta5;gl 8z hy. The operating current is 1.0 A. What is the :0thzkgi5w58gh fj ul ;vb,a/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 sup 3hh-( m9u-q /rsqmls 0gbv+nvply. The operating cuh/qqm(+9g3-uh-s b0lvm srv nrrent 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 6gm0kx+ 7tqeg:a;opk* .0 W is connected to a 24-V power supply. The operating current is 1.0 A at full kk:xo*tp gqg0;a e7m+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 reduq r*ih4/6lyc ace 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 1rnw,kn+7 n;q*h1)zovyi( nmkuvx r (.4 A to flow in the secondary. How vo wq,mkn x1k()ihr ;u+.v *nrz7n (nymany 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 ego 9x:s9agb7 110-V primary if the 24-V sec:aeggx o9s7b9 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 coi 2z2dohi0pgg/l and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the currdp0gi zg ho22/ent in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efficiencyok-8f p-wk 7bdm..sda , how 8m.sw od -k-b7fk .dapmany 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 10h+p+r3 okxig-+ nv zczz;8(ud.0 mA. The primary c z k -uzh+gpzdrx;(+i+8 v3oncoil operates 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 itu j98q xmp. tyfp5qpm8f 9;vc*zqpha39r(5lj s primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in tpy q l 95j3v h(p8z8*ffq;um.cjt9mxapqrp 59he 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 tux1j x+c0o;yuy rns on its secondary coil. If 120 V at 2oxy0ycx ;1+uj .0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and itsoc78ma-u r/ ) dvxyddu1s(v 2s secondary has 200 turns. If the input current at the primary is 100 A, we can 71mu)-d uosa 28rv/d d(vsxycexpect 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 secondjt u*w..zye sua1 qo21ary has 200 turns. If o.1s2uat.* j q1wu zyethe input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its seconda w8whh55es vs1s d5o(qhecrjoj5.9 -nry has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (ne95j oeqv.-8d5 es(so5 h hw1 5crswnjhglecting 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 fkpjsl2 7 :jl.voltage is usually stepped up ksll7:p.fjj 2to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 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 usually ste /lf3kj gm-kv-pped up to 4500 V by a transformer and transmitted through a power line of total resistance vmk3- g kj/fl-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 s2;dw p:a01*stq/kaxy kf bx2utepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltk0q1yb/x *a xda f;2sktwu :2page 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 resists hzp l)4w1eo:hk:urwx,0 t1z ance 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:w xt 0epwl :huzr4)o1k,zh s1 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 luu fg4 ynp;*c c*)b:l:hp, enqine 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energp un*ec:q; y*)npfh:gc u ,lb4y loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power would bf x;0ma g)f:aqe lost;amqf g :0xa)f if the power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generatored: hyjk of,my) 1bz:lc -zq*; is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of tym;q b*fyczlz:,hde 1j :ko-)he 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 enlu3 qt 6ndz6g.ergy is stored in the coil's magnetic fiedtqn6gz l36 u.ld?

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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-ym4vq8 : . bub(*rqion 9ktiw/; y1lmcW resistor and an 18-H inductor. What is this circuit's time con1/qqb;:b n*cy9omi .uw8y( ivlk4rtm stant?

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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 thdx1b/6eo v.eqz. q lz/e rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placeyhq+r w, s-at4s6k3e td into a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the r utw7e zdd40g)y zhp)q,na0ovzbk3*7 esistance of the lamp?pg7d 0o4az)q ud e3nb)vh0zy, 7ktz*w

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the pea ukv0b *e2ks(aim )k4 llcez/9k current through the resistorub/ lsmk 4e k)a*z0i(ekvcl29?

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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 ie fivn-t;k:a/y / qnjhu;bhcm:j /5q-s the power dissictnfq/ ;k;vjqj -mn5 ya/:bi/:ehuh - pated 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 rn4 hqbago*z jqfj0: 5x*;6f4lc j 1f +rcu3fylesistor 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+ j(sa(4uf-.jeutsa)ba9f efwj b+m, ncy39w-W resistor 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 ug-f0p;arv kf5hr vfrm-u,6850-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 ofdj(wnb +97fs baml m df41w1o; a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH6 7gpw)(qy5rys/s be h/mp+ kg 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-mlqmh,) e cu+:gH 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 inductive reactance at 1000 q19nmb.nvwp) 2 cv1r fHz?

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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 a1 eixp4rdc8lt pjd9+qg1n9+ a frequency of 20 kHz is applied to it1+pdtngp9 r q49d1 alci e8xj+?

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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 thro8c gi :ry vcp:4i7*5cl4i(cys f 2hpngugh 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 reactance of a 4.7-mF9atnjjh1)vyxg ;:2p f , lpam( la(,fz 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 have 50 W of capacitive reactance at 10 *o;e7+ n,hftp.w46s o h t: 6cunykxgqkHz?

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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 re( )t pa5i4li hvz3sl8ractance 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 capacitins/ 8+hzvi0aj, an4x fve reactance of a 0.010-mF capacitor be 100 Wzif4+,nj h8 /xnav0sa ?

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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 througcm4ayi-l s osce /+:fqnv9 /)mh a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.02jv l0a h5gzh2 W resistance, 15.0 W inductive reactance, and 10.0 W cap 5hvj02ah2lzgacitive 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, wsys4966j/m. yidv kiand 1.0-mF capa ks/v.y6sw6 yim4dij9 citor are 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 coil,hb) smm ggk-ks8tfwnd/26;8mx; qv k1wf x(e, and 1.0-mF capacitor are com,-/gm8tnsv;mx (x 2 kwkhg s e6;bq8wfd1f)knnected 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 seris;otvs) 2,jegqh3q +e d n- .c:nnezs:es with a 20-mH inductor, what is the impedance at 10sne+o d)sc:zj,q: ghte n3q 2 s.;-nev00 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 inductor, what is the zrrf/t5.fq65jhc *r8ufx 4aino /n /f phase fqnjt5. 58u6 fair hr/o*/fnzf cr/x 4angle 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 sep ,ps d)zwans7j*uo t s,93dy/ries circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W an ,)as,*zp uswot3dy/j sp9d7t 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 capacqm fw+q+ 3ym:c/i/aomitances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at:/ m+ qm+oqc/3yfaw im 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for a torv++8-5u qahw y oo4a )tomqj2tal impedaooo a-2y+h)vq rw4 j8qu+ ta5mnce 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 series with a 100-kW resistor at 1.0-MHz f2uscwgvl 6m+5*qk-p l) rili+or a total impedance of 150 l+w il+g )ukq 5*lrm-p26svci 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 apq - g/1qpz9db5epa+gsv9 :jt 20-mF capacitor. What is the impedance appq+pb/gqt : djs1-9vz 59ga et 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.-da(nmincz+w afs eub*5::p/+ zs +(csgf-r t0 kHz for a total impd-abn wcpg:/ zm+t 5+se(sac+ ri zn:- *u(fsfedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a phaspjt9,e gvrl 4 8ynvx81e angl xvl9 y,petn814g8jr ve 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 -:t0u :lyim-gtvlf obtpw, 0y)4*e eqfor a total :qlwtfmo,bt yy: gve4u0tp i0)* e l--impedance 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 iecs de:,zt k7o/g* fy2n series with a 100-mF capacitor at 120 Hz. What is the phase an/ot c*7e kz s2y:df,eggle?

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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 uzlly g7/au:gn vo 23/5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connecg/ uo zlua7yg2/ l:v3nted in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-m :/v9dc,f wm4kfbp h6pF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circpff4m, /6 d:wvhkpbc 9uit?

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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 a9fdzi4z6 o. 8g ms-uhrim( pm9n inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power souud9zi8zr9gs mm hp-4 6o.(m ifrce. 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 serien0wmzmbdw-;x:,v gwu* -y p7e s RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-wdx*v m z- -, p;0y7ngmwube:wH 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 serie: a d2e6kmceg5ivq9 5ns with a 500-W resistor for a phase angle of mei :nga629 q ec5k5vd$40^{\circ}$ 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 hyv8db9 zv 7a0R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit vbyhv9d za078 be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in anuv wzg;/0lrm pg8(axyq r3)( m ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0mzr3 gg y ;w)a(q/0lxu8rp(m v W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an fg -n/g 9gdwd5fow;9v 5 f*faiAC circuit 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 res j)( k lfqq1 .vii;f m+;ebliww *xc6bv(bx)t4istance of 30 W. What is the powere)vic4)tf; x+v.fm;l *jw 1ixbi lk(bwqq(b 6 factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC cir,caefj5a.w/ 1 oi v52e-ka2wlilj y fag:m84 acuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a oj,e:af5a4a1 eiw2 j.mal85g-ivf cw/kla 2y 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in vlj6ac7oc /3zseries? ccv/7 a3ozlj6

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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 45lgumdq4evzvv / a9)5.7-mF capacitor for a resonant frequ5qld9)vgzvvmu e/a45 ency of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is neede3t1z6/liy8 mtveoclf1y22 kj xh/e o- d in series with a 3.7-mH inductor for a resonant frequenc io em1h lv yt2zxot1ck/3fyl-e/j826y of 1000 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 2b,q uppbmp11zhxv,v)1vz ;s30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 101bmq,pp11 v xh)u;vz vpzb,2s00 Hz?

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