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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 magne5,omf5amle csv0+i 9gtic 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 sta bl,,,rq hv;hojo-de( tes 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 loopsx3ja ng /0bfhp;+a v8b of wire in a coil produces what kind of change on the inducevp3 8b0fh+bjnaa/x g; d $emf$, 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 produces jrr r97gt c1htc7a o:2what kind of change on thej9:crrtt o1 hgrac727 induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change ovf 8c:*x ce:y9+ rkrtb)v2ou kn the inducedcro::v )* krkuex98v2c+ tfyb $emf$, 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 fiesdyx) s2xvq0 )ld 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 conduwse53bj94prnn x v, 0wu,vw3rctor will be that which tends to produce which of th4p,9rebrn3v5,3w w0jxu nv wse 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 hel*zkrm,a4rpp7or*l8 naq: 6ud d above its center with its north pole pointing down. T6 r nr mz8,apu*kldq:r4*a po7he 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 k9q3 w. ouuj tsyb6i5.ffr,;i on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewedkrtyi,5wjf9ou. b s f6;iq3.u 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 toxgkn- s)0 la4cp in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fax 4s k-na)gc0ldes?

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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 0 re7 woakb4h8(ans 3kfield vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coi3 (nw7e 4b08akakrhso l 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 magnetic fv8hi o2hl ;8jo2cw /lpyg0 ta2ield points straig/l o 8o0jgiy2tl28chva ;p2w hht down. 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 lies on a horizo v)7x 2l oltucr4/t:kbntal table and carries an ever-increasing current northward. Two coils of wire lie fl/ : obxr)kl42u7ttvclat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering firstv6),2 iywhim r. As the north pole enters the wire, the induceh) y, 2i6vmiwrd 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 )ya:j9qw x ;3nza-yj 3ei; luhconstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points stranlqyj:hxj3 93a -wu zy aei;;)ight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is r, zl-dmro8rde;p z:h( otated at constant angular speed about an axis whose p hez -m;lz:,(rodd8r 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 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. p dc d*h7hou,5(xtkfw;lvhdj 3oh:* 5
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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 krbm xqzlb4b u(c903,that 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 magneti- j(krezchjf).b vg-8 c 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-west died2plb fd nr cqxeodlu5- c+31710s q5rection) is moved northward at constant velocity through a mr31l q5l s+ qnbuddce5 e-c12f7xopd0 agnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant anac kb7j2h*mr.y /5ap hgular 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 transfojy qd 6f4*hd.n*c7qlf rms

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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 rhc*0brimm (mj ;)1qpthrough 60 revolutions each second. The frequency of the (cjiqm;)h01 pmmrr b*$emf$ 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 de d-n+0 y3edaysvice 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 devicecl((zmq scc9ttc,4 1 j 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 secondary o1j5m96h-iau8ap nse 6jyit / coil contains more loops than the primary coil then it is ano 9u-j6p /1ia5etyshj8mi6a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secondary coig 7k(cnnw9j /a,i ql;wia:s s*l then it is aa9n:l*iqa s;sc (wg7/ij, n kw

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, th4lrxxfbwxd0y (6a 4u6mz ,d/b e power input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant cir),a3f cfus4ux2 ;t wir/o(z frcuit,

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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 batnn20ausv9 xp3k gm vz/ip-6x- -l yh-ttery of constant pt9zv6x2p -n a-h vnl/y-mkus3i0 gx -terminal 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 inductor are connected in series to an idea22 :b /mbm0m5vwllsgql battery of constant 2mg:5ll2 /b0m mvqbswterminal voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is n93k,+kgc6zyf :lstrconnected 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 inductanj 0 ectn9m.*oqfid9(tce L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time co ryzzr7eu2i1)*k/aog nstant for the circuit represents the time required for th 7ezuz o*i1rra2 g/ky)e 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 are connected in series to a battexk ) f/y50pedmg7web o0 kfi(2ry. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current toe)ky e(dbx 0wp5m7f/g io20f k decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same unit4y1.gktf n30n2wv laj s 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 hu*e0;jrm,mcnf2.yo 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 supg( pl1)(1qfyuo 8xqf 0xaer ;oply. In this circuit, the currenpqor0o() gu1;1xl8qaff(x yet

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance ijy9 xx* *lw1tgnz :xr(n an ac circuit changes by what factor when the frequency is triplex*rn 91xxw( :g*zltyjd?

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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 inducts yw* 4gz+mr l5qe,ohx v0,3jrive reactance of that inducto4x *q rs3m jyhv+,gz5l,ewo 0rr

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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 vudmb/t2*b8l obp jr,gy.0 4 yeoltage across an inductor approaches zero, the inductive reactance of d8t u,by*r molb/ye.p g 4b20jthat 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 circuitysthk gqnu49 j20yr+ ,, the currentn+s,2y uh q9gky0tjr 4

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactany4.vfn: stgcr i8tl 0d6.le2lce in an ac circuit changes by what factor when the frequency is triple68ry l. scdf0:v4len tl2 .tgid?

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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) fj1cl ae8mg.g iz8p(C voltage across a capacitor approaches zero, the capacitive reactance of tjeczm.p ) i8g1agl(8f hat capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor an fy-c-q is8am)d capacitor in a RLC series circuasiq c8y -m)f-it?

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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 defing9/2a, yjtatvi-a-5bc+ .3 erfu ;st aulil.ned as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R incren(iu))yp*t0;y m2ene, (, znuh +j tkruzqy2sases. When is this stateme k +hpn2 m2q0iu;u(j(zeyz*esy) nn, )rtyut, nt 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 circui6 a7x6 09hbm,t f jsey6zl8ceqt 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 the circuit in5p-uq65 .t am9spqco:t9tl zj creases 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 circ:diuky8 7wz8(feq /d ruit, the resona/dizk7 8w8 y(efuqr: dnt frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an Ac yd4htl42h7sk;6 oefC 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 RLC0m0y er(tk l2dz3bkk : circuit 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 is rota.p:g)l,r8o f9s9gl*zd lkkt. h lrb*g 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 are paralled9slo b*k:.pgggrlt8f rkz )* 9ll,h.l.

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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 rotatinv4ve3 fven11 d9cxq mm5 b;j- .gpr2ctg in a uniform magnetic field of 0.20 T. Find the1mvc4r1 -3ce2fdbqet 5jnv9 x;p.mv g magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m i+5g/3o-hevm* np;xs* sj7 4dyq+a urq pu,qlvs rotating in a uniform magnetic field of 0.20 T. Finp5-p n4,y*+uq/;h sq dj r*m l3sgva7 u+qeoxvd the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced fromvjc a* l (sg)ra8/d/a nh/tsd7 $1.0 \; m^{2}$ 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 coc 93 r* px -gu8j7ynn5fbfy+hnil changes 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 f, cx7p.15lkn+i oxkk zrame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field o5lkkxnpx1i k+c7.,zchanges 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 an ar9as,fn dq 0vj:ea of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area -rphkl8 fr i ieco 7y/:(1ggn;$0.20 \; m^{2}$ 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 th3us.cds jxs 06 7mry2a7mkf0je downward component of the Earth's magnetic field crssmjkxfu2 67sm700 y .d3 ajis $6.0 \times 10^{-5} \; T$. 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 an eqp2rcms v96k4xs6f7kz y a3,gular velocity of 2.0 rad/s about a vertical axis through one of its eneyp 6q7sk23 axz9 vmfkc 6r,4sds 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 hf7hb+ q svhe55,id6 goas 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 tm/ eu* kx6 j pbw+mg7rqid((a3urns 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 r iy ju54-qs )q:wkcl9pectangular loops on its armature. Each loop is 12 cm long and 8wspu- )5iqc jq :k9yl4 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 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 consnq+:vio w. :cd/hpqf:-zo4 oiists of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced 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 output o 1j3se po6m*k)( stzwu(z9tpu- q +vmdf 12 V max1zp+st(e pk wtjq*m o3uuvdz6()m 9-simum when rotated at 60 Hz. A magnetic field of 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 genera 6vwr*g*w omwud;:hx ,tor 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 o vuds rx/8c8a+n )deh vq8-oe*f 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. The motor ope py8l+ l83n ozf;wlsp(rates on 120 V AC, and when running at full speed it generates a bac8lwf ;lnslozy (8+p 3pk $emf$ 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 i6j /2h6 jngmsz)hcz mba 6p*3js connected to a 24-V power supply. The operating current is 1.0 A. Wph6sb66 hc3zj*za)jjm gn/m 2hat 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 aa/wo 1s;j 2oel 24-V power supply. The operating current is 2wje/also ;o1 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 resiswqex2c.3noe5 tance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What3wo nceq. e52x is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a pr a(f6y6qkqdd 9imary 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 ;cyq d.0, )fcc,vrw*puohv d7 transformer causes 14 A to flow in the secondary. How many turns are in t,fvuhqwv cp0 ro; *y7c.),cddhe 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 the 24-V se-;:s kvhcmh 8ncondary has 100 turns 8mkn;h ch:sv-?

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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-tut3fbu8 vjlsnmn2m5 s9 z x/(s+rn primary coil and a 2000-turn secondary coil. If the ls+jb(mxmf9/ ntns58 2 3zsvu current 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. Assuming 1vbzx nbx9,(n :00% efficiency, how many amps at 24 V can flow in the seconda9v x,nbxnbz( :ry?

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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. T(dfcuv) 0wk epm3n.f- he primary coi.d v0p(n3w)-fk meufcl 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 its primary coil and 300trvb ke163v;uv 8nbe 8 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary613;vtkre 8u 8 bvnveb?

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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 ivcgw xz84 *,gcts primary coil and 300 turns on its secondary c,cg8g4 x*wczv oil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and ig2vk;ulf z 7iwxw6+d) ts secondary has 200 turns. If the input cu)ukgww72 6lifv +xd ;zrrent at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its sex v 3i27ehncbx)kc3 (mcondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the sehvbckix c enx7m3(3)2 condary 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 secondad -(jvrp brtxgc7, .f6h*e,w rry has 200 turns. If the power input to the primary is 100 W, we can expect the power outr6rerx jh- 7,tv(bgp*fc,. dwput 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 currenreq sg 9*n,gzv:a1 3td/v):ko hc wl4vt at 120 V. The voltage is usually stepped up to 4500 V by a transfooega *khn3/sw9 r dl zq)v tv4vc::,g1rmer 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. Th)24jwl p.ze iye voltage is usually stepped up to 4500 V by a transformer and transmiy 2ez)lpi4jw.tted 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 ofaigluie.: fa5mho )5) current at 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 percentage :5l u)hog 5fie .)aaimpower 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 resistance of 0.60 W. A gelf s.)5 po6kcanerator 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 ratiop6ks afocl5 ). 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 lon,oap:0qu2 )a (hovt s5vmdsn+88 dayqg has a total resistance of 0.60 W. A generator produces 100 V at 70 A. yavm q8,8d+ sooaq2:(05v)thsdnapu 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?

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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.f.x b3l 4plqptgk1/v line at 1000 V. How much less power would be lost if the x b/ p1pgqt k3.llvf.4power 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 27o- pwq:r. ,pjyuebjyr74ii3 0 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 pow jy3.bpewup -4:y7jqir7io, r er 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 Ahx1igy:-82am+itcn d . How much energy is stored in the coil's magnetic a1-8c td +xm gni:2hyifield?

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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 jdz2a4 i: mz(x1z7cyh 18-H inductor. What is this circuit'sd haizz4(jcx1z: ym27 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 Ag dev318tb:f 7+xo-dzlc. h-mtjdsv + C circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. Whav nkmm9:4zlm/yr pgx qu+xv4lh )vvvo;8 ;-5vt 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 t pc+.msr:kjo8ruoe(c6 3w+tp he resistance of the lam r o:o 3cwk.r(6 psut8ep+m+cjp?

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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 v6vbj9o1xeu/) bqf0k ac power supply. What is the peak current th1 0 )bvvq9jbfk6 ue/xorough the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the power fl; gjazd ok/y(z4/b;dissipated in thy;jz /4afdk ;gbzol(/e 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 w+t yye argqjn) 1:6u3a 50-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 advp62831xjnap ep;7v qu me u4 50-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 50-W re9 wa(sgqypt9 55jtwzn :l:08/bpi-zaohc)gv sistor 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 inducto e6xxmgt/2m b8r 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 reactany+d2 46d ioflxk7nxr )ce 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 of inductu.r8d7xf t,)igmb/*xf xkc -qive 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 reabx6-*z f.fcne7t1lb7l cnq q 4ctance 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 when7u tunnuvz)q:4 iq.l 1 120 V AC at a frequency of 20 kHz is u)u. 47qzvtqi : nnu1lapplied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 1p3eedd / w-jo*10-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 reactak0y r9: :r(ly bfrscq4nce of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive repw;7s9cgqj 6 wbvpt)z(rg+.x actance 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;foyt.n 93ffrz+r w/p gtx1f- W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be( / gwm 4wmzby*zezmb 25;ft3d 100 Wzd;mw34(ztybf gm/ w zmb5*2e ?

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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 0.0h0o0hnuk,2i; 2z1q8dzfnx lt 010-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 12.0 W resistance, 15.0 W n eo(.bf0mf1 linductive reactance, and 10.0 W capacitive rl0f.en m( bf1oeactance?

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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, aivjg yt.7) a5znd 1.0-mF capacitor are connectejz7tv)i 5ayg.d 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 resypc*hfa ynd ib .yvbdx55: *d,vuc480istor, 20-mH coil, and 1.0-mF capacitor ar ,.f:cdd5y* ybn d p*8vvyc4 ibxah5u0e connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH ic +d kq((m h)q,jaaa56td9wepnductor, what is the impedance at 1000 ap( ,k5 )d mha96aj d(qewq+ctHz?

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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 resistorlj l- *p1dx0fg: 6lrlj is connected in series with a 20-mH inductor, what is the pg 0l ll-xr*:lj16djpfhase 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 wit0elyq :4ywvf9(pl i2nh a 20-mH coil and 1.0-mF capacitor for a total impedance of (e 0iwn y92ll:vqyp4f 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 capacitance5n/rfe/ ve +bws is needed in series with a 100-W resistor and 15-mH coi5f e/+nbw/ evrl to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hzr 3*p po3cd-0 9y(lftyxis )gv for a totaloil s3vt*gfdr 0y xcy -)p3p9( impedance 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 8se4*ff1frmf ; + wanrat 1.0-MHz for a total 1n f8wame 4frsrf*f; +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-mF capa vp 1tyc1v, sey+pli86citor. What is the impede ,p +cyvy6 1li8v1sptance at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 1r ijw (ovj3(*, rruw vozhf:.9g*eoe: 0-mF capacitor at 1.0 kHz for a total im: 9w*ig:(w*.(rzo3 ejev ojforru,hv pedance 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.gheq vf.+11j rinckp6au8), l 0 kHz for a phase angle8c l6nfij)g1vkequ p,r1a h+ . 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 wijg,dxsd0mi q: bk8;+uth a 30-W resistor at 1.0 kHz for a total imj b0i8,;s dx+kdqmgu:pedance 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. What is the p x,.xh veaq,h2lleoi7t/(5gn hase angle? n,xgll2h5eiox,h( v/.q7a t e

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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 coil, an2m:w:9eof agbnbame6osmm x, 128 cc)d 1.0-mF capacitor are connemc8 2g bnfa16 :se m:mbxo)92ma,wc oected 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 10.0-6iwvqhve,yhs cc u4q f-3z.)+ mF 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 th+f.zqhy sche6 v)4qv3w uc i,-e 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 rean4i/o fnp*d 2nctance 30 W, and an inductor of inductive reactance 30 W are connected in serdin o2/p4fn*n ies 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 resistoezirj8i0n. 8u r, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power8 zure8nj.i0 i 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 nci8 5l6qj-k rn;x 9gnpimt9)eecessary in series with a 500-W resistor for a phase angle of 9i5-nc ij9 gxkrt;pmqn e6l8)$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 1v 1z02p+pguco0.0 mF. At what frequency should the circuit be drivg2pcoupz v0 +1en 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 an ac series circuit with 12.0 W resistance, 15.0 1+c25myfyw owyo- j*b* ;f )v-ueu uw 61eokrsW induvyr-+mbs; ujcf*y1o-* 6wfyoue5 we1oukw2 ) ctive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC ejo2, 1:lxyekw b--weccv* *:t0uah ecircuit 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 imp qqrt gk 6b2 dix4;ps+j2aw95eedance of 60 W and a resistance of 30 W. What is r wge9aqi5px2stj+6d4k qb; 2 the power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containi+1 v 7s.tn. nqu2qcxw 0y.ggggng a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power gq7s .n.gg2ugctvqy+w.n x1 0supply?

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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 serlwh. lk..4 n y/-auvqei:c)skies?ks:w/lc .i)4e qluan.h-ky v.

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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-m* 5 dy uh-z0rv:k(krde lf*1) dmbq0umF capacitor for a resonant frequency of 10 kHzmuukr m5* zfed*d 0hq):r- 0(kbvl1 yd?

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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 s: 2j.(ac r-ppqjux+ nmeries with a 3.7-mH inductor for a resonant frequency of 10p. -up:2j(r a+qxnmcj 00 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-m fkqc8pu17 gfo; rt3o) bn3bo3u,,bd mH coil if the resonant b83t; bd7n f3,kmufooro b31)q,upgc frequency of the circuit is to be 1000 Hz?

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