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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 u,o0r30nfmtzqi, f2gr1rkc z 8nits of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of inductioei(3b jsa9f7fn states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what h ;f*gi8 tu8t nkk6izi(cke 12kind of change on the i6kicg; (z8 t2knft8*ueki h1i nduced $emf$, 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 fiel* pi 6twk3,adi3- / 3sfjfflchbps97md through a loop of wire produces what kind of chang633,pim9chldbfj twsspai-f3*k /f7 e 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 produces what kind of chang gr6slsqut ;n,/0wt 8zh 9djqj7mx2j 9nbe; a,e on the induced 9qa,l/bq0j;mn6;7 u2ht, dz8wx esjsr 9gtnj$emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field ant vut7gh0/n mywa4) ,o $emf$ 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 5 *adpb,c pfqy e+z19nlaw, the direction of an induced current in a conductor will be that which tends to produce which of the following ef1z9fdppae+ qy,5b* c nfects?

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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 aepkiayp05 *ar *jg /s19)wz ) ycpu2mp horizontal table. A bar magnet is held above its center with its north pole pointingzk*/a ) sypcp*iegu5py0wr j )9a21mp 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:/ 1n5wy(nphja ryoa3 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 viewed from abovnp r(ya1n /oa3yhwj5 :e)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector poigb5f:w dg) f,phjto33 nts straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sef d)o,533p fwgbtjgh:nse 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 magnet sb3 72ifltdn*ic field vector points straight up. The magnetic field suddenly grows strong7b23*fdnil st er. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a regmz.e r/lonn;)ion where the magnetic field points straight down. The magnetic field dis/z; e.nrn mo)lappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and dxvkn9 1sc +,zcarries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side o9d c1n,sz k+vxf 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 first.lslp,m7 m s8u)pzt;mp 0br(l)s6pb+ w As tp)ll(7wl+ ,8mmps 6szb)sburm;pp t 0he north pole 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 angular spe499eb yzq(yeeed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight dq (yz9ee4 b9eyown, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angul f )gx-4n knl::/w)ba8xmp wemar speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the inducedxaenpwwf xm: )n-b 8:)m/l4 kg $emf$ 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.m1 cs31fq6pvz:fe-lfa;h*c b
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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 an is)0cpr6k9b. nkof0f$emf$ 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 mt8 *hm2 .m )zeh2eztcjagnetic 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 directi2:9gpu8i4aa7f 9kpqe xyrw,u k8 qru) u1*ppp on) is moved northward at constant velocity through a magnetic field that points q9a k pr*ge uw p8)fu2p4,ui p9p7yu:qrkx1a8straight 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 con; 84q.t3 wxt-j svsf0) rpnh9gwrsr0qstant 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 18 rezn:-dzin0- qs satransforms

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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 revoludkt s2 td+6 tzo*e7y9r:,jacwwe18ihtions each second. The frequency of the aw* et6ew +zrck:i9s8hdd , yj172tot $emf$ 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 d5*pvps.aiez3 evice 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 devk8nrv i 4adyjj11)2w mice 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 coil contains more loops than the primary coikcxh)o2o;;t01 rs t wal then it is acx 0;ot1ow; ta2srkh)

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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 co v 6wq 4y,hy nbm).iqz(i)l c5vwx94r uy;npr4il contains more loops than the secondary coil th y5iw(q;n4)wqzn6 rl.byyc4 x,i4p9m)v v urh en it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inppy5s40vw1ff(j ;su wvut

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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 resonani loysm .9a50pt 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 oofu4v h4 l83whf constant terminal voltage. At the moment cfw u l8h3o44vhontact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of cona nuh3g9 dc(gbqnaz,4 r78o8d- oiu z7stant zdcoiaz4 agq b,3o ndgu(-8hn9u8 r77terminal 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 inductanc 2xvsi cj(;2205 lcxcn.zig lle L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected9 -88aeik6vey5ydx rmz5r ; kc 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 connecteddv bzu (ol*u;: in series to a battery. The time constant for the circuitd:buoz(v u;l * represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are conne5 iuqx 0 ; kjxnb u/::s6mqflshz./s3 /da)swgcted in series to a battery. The battery is suddenly removed from the circuit. The time constant for of th.g/dwms;:js3a nl6fh0 qq xsb5):ixzs /k/u ue circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same uh:0 1qmye -rcekht6n /nits 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 suppz3 rlunrc:5au i:s 8 gxc.t;,mly. 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 +gm+ez 5cvp*d*t)qqr this circuit, the current*+)qvmp*z +e t5qcdrg

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the freque :b2y7svg z4szhv 2k7jncy is tripleb 7 22:s74khjzz sygvvd?

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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 induccidlched0iqvwv620v 8 cqqp.a/)q 1 4tor is doubled, the inductive reactance 0q)qd8qq ahw /v4.p0cdve 6vc1 cl2iiof 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 induct; syfpc bt:kr zp1 x+qzfm)/ vg6.sk4t 0n:;bkor approaches zero, the inductive reactance of that csrtznb 40 6s1+y;xk ktqv k fpf;p:b/zcmg.): oil

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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 thgsot v ggb f3u,p9jp e5 +)5mvgvf75j5is circuit, the curren,bu+gvef955mf53gjp p vo )vjstg g 75t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what fact/5u+ue y ed;gddii.l)or when the frequencydie/+ idu5 e).g ulyd; is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, bg 1d)knxwm4my. fu:i -ru l3/the capacitive reactance o wkx4.u/bl3-uf r ydm1i)ng: mf that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and ca67i ;jp:8tiob xndz o6pacitor in a R;djp 8ooz67 xtn6 i:ibLC 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 hnz;p ju12d; am(mu 7ddefined 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 kvq2bby c 0x1s,;sgv(circuit increases if R increases. When is this statemen bbvscxqg(;y, 1s k2v0t 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 impedabp (m/cjqh.uvk( (pv)ty0, whnce of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedan+c6jc yjsf9z)fek h mr2667g9)vjpn k ce 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 sks43ux e2zdt .kaoe3wv)p +5 double in an LRC series circuit, the resonant frequency of 3ae+4 k 2t)s.xvkwe 3 dpz5southat circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied jsvcl*:cws va3hya 2k0d2 w/-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 g (4)ubl x qx vw,bfju4a04o*uRLC 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 rotating in a uniform magnetic field o m-g5qtz-jegfm7a 12p f 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vecto7j-tg5p-a qz1fmg 2 emr 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 mhudd4j(zeeoive 5*2av 6v q2 2agnetic field of 0.20 T. Find the magnetic flux td6 22(2ojhqeivvav 4uezde *5 hrough 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 is rotating in a unz x;g:2-k3hpg: r b vlivn5.bbiform magnetic field of 0.20 T. Find the magnetic flux throv.bx- b;5:hl2zggn ipr :bkv3 ugh 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 /9j7;rdnic :j pt u6v 7dbvl6uis 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 chj1.cj ahubh18 qgz,e2anges 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 jk8jzv.5ze1 9rvhri 4square frame with sides 18 cm. A uniform magnetic field is applied perpehzv4.8i1jr 5jkvz9rendicular 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 tu9fauol3a( p c9rns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns an;mz)d-hz 7yk;z lzct3 d area $0.20 \; m^{2}$ 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 o i c8evi8)zr,t l/uy2zf 60 m flies horizontally at a location where the downward component of the Earth's magnetic field itu8 i)y/8l zr2z,ivces $6.0 \times 10^{-5} \; T$. 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 rotate.0 uq ym rnyy8pn-wv,6zp:bo,s at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic -68bwp,u mnyoryvz0pn,q.:y 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 hal3e bg,l5wm d3s 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 turns of wire h -0enug6 ta+ pm9p2 (si yf/zu7(cbxrof area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its ar yzr,. ub1xkebvg7(6kmature. Each loop is 12 cm long and 8 cm wide. The armature rotates at,u6z .e kxgy1kbb (rv7 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 consists of 100 turmgq;p22 f qbg,ns 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 oc5u4vu ot6qru7 0 /ddvutput of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. I0 6u vtu/o5c74dv rqudf 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,p5:c,;sppgmtai-f t, gs 7 nbtor 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 havuzhe: )gaa,iittqlj/- s /6 bkscj,,2e 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, .l2ich edozv 7n)0zq. The motor operates on 120 V AC, and when running at full speed it generatcq7ehoz2d ,l ) 0.nzives 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 powerxer) +6x(vjs hf/5zxa supply. The x /5r6s)ajxf( +h xvezoperating current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resista 6-4wbknnf ix2nce 6.0 W is connected to a 24-V power supply. The operan fi2-b4 xk6nwting current 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 zo : 0jzudr;c:fl q)hs1qvu861k) jdp6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back q: l u;0ds1c ujqzrdf)1o68k:)zj vhp $emf$ 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 primarad v)(b yew2rpa0s 5f0y 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 toxdr zv. nhzi hsywo((t 971r;o1,6au v flow in the secondary. How many turns are in i dzx69( y1,a;ounos wh.hrr 7vt(v 1zthe 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 many3*wo*9mbt mp g turns are necessary in a 110-V primary if the 24-V secondao*p9g3bt mw*mry 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-turnc( wjlvx)b3p/ primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the pril wpb(/xj)vc3 mary?

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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% effici0+wecc 9tc*kb ency, how many amps at 24 Vctw c0+k9b*ec 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 provn8383j z:k2fc vur.gdk4 s hzfls8*kvides 7500 V at 10.0 mA. The primary coil operates on 1.8 8r2 3 3kksgd f48vhuv fz:sc*nkljz20 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 6hd*1+d63va:0oyvk1i g6 z zsq 3ezenm 0 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 nvah*0y1dzgie1z6+3 3vosd kq:z e m6voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turnsdw l8e/)-yr(an *ogd t on its secondary coil. If 120 V at 2.0a8d tel yw*d)-g(n/r o 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 s x7k92n+mrc( qmvh i(:m/tyshas 100 turns and its secondary has 200 turns. If the input current at the pri(/ nm9m7ch+ :ks 2syrqitx(mvmary 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 tudt clk/+zn:n- rns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output volta-n+zd c/kl :tnge 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 aw8 +ky;ac af1wnd its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of cy+ 1kww8;aaf 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 current at 120 V. The vocyq) itj 82oc1 odiu3,ltage is usually stepped up to 4500 V by a transformer and,1cuoy qi83d ocjt) i2 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 voltohwvv0 y2np.l 69rxg7age is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmir.vnw9v pg7h60y2 xlossion 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 usualkx u jb 2*lq)rqpz66y0ly stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find t)rlqzjp0ky 6*2 uqb6xhe 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 line 50 km long has a totalnf,zejm,++dbg 3r7*a 6g kg bi resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up wit, jd ena zgifm7g6g*+b b,r3k+h 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 resistance onmg;n7 z*rch +f 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss nnrhm+*7gz ; cdue 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. gcq, n:b(1i ywsu wj;,How much less power would be lost if the power wejyuw,:i(gnqw s 1 b;c,re 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 tpx h:e ht*8- n1qmm)bwransmitted on a line with resistance of 0.60 W. To what voltage must the generator output be p1hem mhb- x:qt)n8w*stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a currenac3 ,bkmnj b:/t of 5.0 A. How much energy is stored in the coil's, cbn/: jmbk3a magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W rec/c/qt) vt qgw;7x x4x.9fuj csistor and an 18-H inductor. What is this circuit's time/)c 4cvxcx/ x;wtqt7.uj9gqf 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 rmsg9o +0ylc qkfog, 1gv- 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. What ipvvwczzo1 nj(:*d1 j2 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 place44w i)j)sw kfqq s1n3wd into a 120-V AC outlet. What is the resistance of the law4)4)3 i w1 sqwsnjfkqmp?

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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 peak cui5p enq gamb:k+-4oy 36k)zp irrent through y54 i6 nm gokp:zqa- pe3ki)b+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 conn1h o6d 4fp.5lh abac4eected to a 120-V ac power supply. What is the power dissipated in th51pl eo 4afcab 4dh.6he 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 9:3llno;br0 u5vgn lj/morn6a 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 a 50-W resistor is2 .aw) /nwk/l dqef3 dxtgp q6ydej28 fpu.s2) $I = 0.80 \sin (240 t)$. 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 resistorp xocbm 67b99zlv:w: l 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 ina(b8s5g* uf ekductor 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 100vc i i,,5g1nisi;ktu30 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-i cadoj j(l0+):v)uedmH 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 rwwd*75xeb x z4eactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 kHz 1m;gkqr0 gtvukdg qc;3(9 8i aig9( lsis appl1gg ;;s9 daq9lmi3gvi((8r kkc gtuq0ied 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 110-V, 60.0 Hz so tjtuh6(/u1s (iqg9pxurce?

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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(jq6lwdfisfag, e,7v9e 9 1 cj 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 10vt2oyod(d 40) +l2au-r h:fdfqkig (a 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 +3l8/f( h ozznso1iph3)lhjlof 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of ahso4d dxs0 2t n5-;kfw 0.010-mF capacitor be 100 W?dn4t5osd-s ; 0hx2wfk

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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 cfk,hys9zu ,b9 1hfw/tapacitor 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 inlj hw9 kivm ;a,pgrs6+6 rlm73ductive reactance, and 10.;6,mlrk36vwasl+ gr7 p 9ijmh0 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(aa7 mnsia qbkif61hr.w9h9 4, and 1.0-mF capacitor are connectan7k as 9h.biqwfm6r1 i9a(h4ed 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 z9mllv1h55d h 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor arm 5l915dvhlzh e 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 c,c vrst7jlmhr (f j849onnected in series with a 20-mH inductor, what is the impedancj 4l mhtfvsj r9rc8,(7e at 1000 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 h ksloj ag hz5.m;uilk(5adnv g,75se/v;7c7connected in series with a 20-mH inductor, what is the phase mh5jk glvz7s7o 5n;;hc ia/( 5 lug7v.,akdesangle 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 *g 6rg ysx.sz)3sro 4e20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1)rsyx*gr gs.3sz64e o500 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 capacitamdd*wa i / .5fnegy3k9nces is needed in series with a 100-W resistor and 15-mH coil to get a total impe.da3e kfyi5nw/* 9g dmdance 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 induc3dtpi,z7 syvu; o3so9tor at 5000 Hz for a total impedance of93v7is3o; tzd,ysp ou 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 ats5 esi;, 7noo-ntsw;w 1.0-MHz for a total impedance o;ts wo-7iwns;, 5no esf 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 capacitor. What +vc*l*x.nc opis the impedance at 100l*oxvc .n*p c+0 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capa zp4 /0p8svfrycitor at 1.0 kHz for a total ip sf4zr8yp0/v mpedance 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 1a, a1.p)xv;ftl c1 pis.0 kHz for a phase angl .1 l,txip;)c vafpas1e 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 a totalub56i okbz/ap c*g7x7 impedance of 45 *ga6u/b xbi zo757kpcW?

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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 isb5t;ebf 4i31ei , nqsj the phase angles3i,;tie bq 1j4ben5f?

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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-mwf + cmxk ;kosn,y8;(tH coil, and 1.0-mF f,8 ; ktysox c(;m+nwkcapacitor 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 consists of a 100-W resistor, a 10.0-mF caly*vby *2i ;j+f t5o3 nkkvq0opacitor, and a 0.350-H inductor. The circuitvkf*y 5l0 ;v+b3tq2 o*yj knio is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive react kbiux.r1kjtaw/e 5(8ance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What cueia tk/. rw8(51kjbx urrent 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 cdizh767p- ji7pz ybhhaw,i2.ircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power 76wy 77 i2bhzhdpi,pz.-jiha 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 au d26d9tvt1oaqrc6.m phase angle ofdv tum.c6o62aq1 r9dt $40^{\circ}$ 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 72y6p tzo4o *uoladn7w hp5-h has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transp7t6ohanz*y lh pw47- do5u2 oferred 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 resii3kaz n22zb(gpr98dkstance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply3kp d2(8a9gzn2bzikr ?

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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 circuit is i xtv8k.g)m jv1b+n.rr9wn :s$63^{\circ}$. 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 resistance of 30 W. k c8jaou9ns9 2What is the power f89noua29 skjcactor?

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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 containing a 50-W resistg3 pkl ornn1 w,.l+bp-/eupwrz6)p 4lor, a 10-mF cup o+l,gwennb/k163rw l4z-. lprp)papacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency owf88 klmr9q t9f a 1.0-mF capacitor and a 15-mH coil in series?w98tq9 lrmkf 8

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a re1 eq:n c6esfqq gxb13,sonant frequency o q,6eb csqq1: xfg31nef 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 needed in series:-li1b:+h 4 kuecukmyfx7qd6z7b :nz with a 3.7-mH inductor for a resonant frequency ofmu :14kze-6 xfu7d k+7::zhiy bqbnlc 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 30-W resis7hcdd s0hm-l-o p2/jttor and a 40-mH coil if the resonant frequency of the circustm cd2o7/lh-hdj - p0it is to be 1000 Hz?

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