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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 magnetic flu2y a ku8 zrl/xb1.j-g w fy0(ohfa6q(ax 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 stuzw *yq(hfr-8 mlgwg:4, hm0.syba .gates 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 co( qdvqm*;c1q3et3w(bi glh: til produces what kind of change on the inducedqlq(:dmvq*e(hg3c13;bt i wt $emf$, 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 ( a 9yq4u n(zs9wv0nobwhat kind of change on the inducedbq zau9(vs y0(w9n4no $emf$, 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 7q-l: ; hvx/0qog vw9muwr 2n9ls9/u u9byh rwa loop of wire produces what kind of change on the induce2w-l7r rq vw/lubo nqw9990:y vhms/u9xu; hgd $emf$, 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 fth6t4ci6 u vc4ield 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 inebqj1/fs 0yvbf k 9idu; 9i1,,ely9ffduced current in a conductor will be that which tends to produce which of the followi9 f,ye,/ fse991;lqib 1vuf yfj0dbking 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 tablucxrx* gk63i vupaai)1h9 2*7vj1wb i e. A bar magnet is held above its center witiwx9a b 76*vxv h2ujc1p kgi13*)auirh its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abosai.uq3b(z/cy 0p5z mve its center with its north pole pointing down, miq3 .pzaz(y scbu/ 05and 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 toh+jme2t wv 23yp 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 fad2 h3+vtj e2ymwes?

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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 region83q,j3q5j he7bkqp: f;ios e g where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction ofj qb3pje:;q8qf,s gheok i753 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 horizongan :m9dn 1a74j eeoc6tal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When vie:ec9gd7n6e 1noaj4 mawed 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 carries an eva1lnvt+5q a8l)u *u83xkomlh lb )qm+er-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 cutl8) 1 8 mho u)xlvaa+klnb3uml5 +qq*rrent 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 enter:swqbjz 5xd8 1 ,wez7fph 9kg.ing first. As the north pole enters the wire, the induced current will be (as viewed fro8 .g fz1kz ,dxjp:h9sweb75wqm 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 mm6-aszanfz120go v+ at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, wha6m+az s 2gza-1n0m voft 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 con5nb9 gl l0h ;dd9nk)drb7 wz2/muk2utstant angular 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 a unduwk;n l z2k)m9d5 l0h9rb27tgd/ bxis 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.xdom 0b:6qdv4mekf98ai1ds :
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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 thn;(k-57/es ysfgl tk dk1h2 cqat 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 magneti7,lhha/x r ux2c 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 direcdn.vh/z: :k,heo 9wpn tion) is moved northward at consp:ez :kno9hw/hv d,n .tant velocity through a magnetic 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 angulv)6s4oco9+ dv l)pp-jsiy jx2e(qg.dar 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 t99 s 0pqm5v.r ik*ejbx8kk1s transforms

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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 revolutions each seconi8/ oh3wux t5rd. The frequency of the t x5wh3u/r8oi$emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device ufcq,r* x+wu jk0 -ufsjz8q8,ased to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device tha i 1 s.envmwsy//6l; onceb9k(ht0; ekt

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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 primaresx)w4sm 7zo, y coil e xosz,m)74ws then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secondarn*4 eoa;fri4gy coiaro4g4 in;*fel then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inp +o++(ot i402d;lo xmgpxflwvut

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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 resonancusvbvg*i- x:5u c6;yt 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 indf:xo x5 qj7)txuctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltag7 x):ofxx5t jqe 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 inductorxywt-x, v)q -r -b6hob9dw ia+ are connected in series to an ideal battery of constant terminal y- x wova--)9 hrd6bqwibt,x+ 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 conn 60jwxmk3r7 kjected 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 connectei ) o+9+hwp,,tej6ubx dpsb8, vbl s9kd 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 serk8pzwed -s:i kmgo26i./c0td ies to a battery. The time constant for the circuit represents the time required for the cucpiz t/82 w0om6dsk- .diek: grrent 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 battery. The ixo7y27joef:2w qd0 u battery is suddenly removed from the circuit. The time constant for of theduy22jif7:xo0e 7 qow 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 saul7k6) z tn4cu(wv3con:z hr4me units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, d x+i :7kidh-.-yut(ic k*y tithe 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 x9gfto45z5hujb *nb ; this circuit, the currenbo ub *xf;t nh59zgj45t

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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 bsci*: odmd1/v- r6ew7s/-b5wqu bq vky what factor when the frequency is trim5cws:udobqi6ke/-qrwv vb/- 7d1* spled?

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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 ind.r0ep8q (i-tvdo qcv( i0+j qvuctive reactance of tha0qv jtov q8 i-.(q+p(c revid0t 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 vodx1 81)ita zvrltage across an inductor approaches zero, the inductive reactance of1xarvzt1 i)8d 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 98bpsx -f:8 m2z7d *n)ltnc6r bmqiltconnected to an AC power supply. In this circuit, the curren) lnixrc-spbm b6ltm 8 8t9dnzq* f:27t

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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 facta,mqa,:j.a fxu/p n(hf :miv9or when the frequency is tripled?:nju(v,a m ,x./a fqhpamif:9

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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, the capabz*0n a; ae8wacitive w; 8aneba*az0reactance of 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 angletmbj(k -wlp.9 mzwq)3 between the voltages of the inductor and capacitor in a RLC series circuit?j39l mzbq w(pmt.-w)k

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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 circuitm i1 (lj(.ifgw is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. Tc p0+al kp7+qwhe impedance of the circuit increases if R increases. When is this sta+wpl 70ac q+pktement 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 ths)tqvr,0v2xu rk xvr -16h u6ae 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 seriecq4yf( 98e rhguce(,*kb z.xw s circuit. 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 capacitancwednk. m 9536od qp7:h9 pbamye both double in an LRC series circuit, the resonant frequency of that circui 3n 7:b dm5k6mp.ahwd9opy9qet 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 a swg fn.2aw6o8n 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 when8u d ;/skic3pzwzlz/+

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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 radius8mgctzz *8qz.8f2g qi 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are paralleqzfzgizq*c .28 8tm 8gl.

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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 magneticqj+d gc,c ..is field of 0.20 T. Find the magnet+. jig,dc. cqsic 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 is rotating in a uniform mag0y z)ds a:+g ha6s6nod:x gsd/netic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an anhdo / 66ssz+xga:g a:)nd0dsygle 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 akx9j* e ue0c-7ghc dgq/r h*e8djustable 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 cil *6lxca;uxnd 6,3qdoil 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 frame with sides 18 cmj8keqg)l js60yq:j ,b. A uniform magnetic field is applied perpendicular to the plane of the cgqb k) jqe0jj:y 8sl,6oil. 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 withozi ad ov f)2qulqr80zy200q( 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns c;ia0fiq* rv ,and 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 of 60 m flies horizontally at a location wherxvciy4 mec4 er4 v02+l v8:mlirsb.7pe the downward component of the Earth's mam0v cr+rsi4bme 4 x82cv ipyl7lv:.4egnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar thaal2q ,nc 69*lbge4yle ze6m2ut is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends wlz eq6bg94e2nlue clam2 y, *6hile 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 looppm91t uh2 zzs*6 cz;zwfv/8z6:eqqins 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 o9cl ;o*0r bobvic7d:v b g *8w;gsib.if wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its yi wy4t,k9kr/g) kj,varmature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximuwjyk9)g, k ,rt /viky4m output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of aream )jgvf e:42wlfl.-qx $0.090 \; m^{2}$ 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 A67w nmbci69h jm : af-np90vonC generator with an output of 12 V maximum when rotated at 60 Hz. A magnpv6 ncm n9j-mioa6bwn :0h9f7etic 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 generator with a maxin,7jeeg( wy3ha ex: 7umum $emf$ 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 resistancpk w6pk w3/q2ze 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. The motor operatb;ygy wol)k4 3(nu v+les on 120 V AC,+; y4lkv bl3()uyw ngo and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resista tiz;ry w90a3snce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up curre 0iz;tyaws93rnt?

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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 po n2bk)3bd)ilot( ua*ower supply. The operating current is 1.0 A at full speebaio2 u))*ld kn3otb(d. 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 resistx(iv w6/yn4nmf v1k3dance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is(w fvx1yv 6ikn43nmd/ 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 primary v,1hbt0l*oxzru a8u-yoltage 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 to flow in the mnx+ d/9vlawcgapib2 n,y110secondary. How many turns are in i 9g bpdy,a2l0/ vnx+cw 1a1nmthe 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 necess,omexu*3 ,c ygary in a 110-V primary if the 24-V sec3e,,ux c*ymog ondary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turncxc0a)y (3m/mylyz m oi)f c5, secondary coil. If the current in the secondary is 3.0 A, what is the current in the primary?5im3,lmya()f )ycz coxy/cm0

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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% effifot2god/sf c:k g;.9wciency, how many amps a9k 2ft:;gc.wogf/d so t 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 mct(;00fgr c jcy;4qfneon sign transformer provides 7500 V at 10.0 mA. The pric;m;ffq (gc0 y jct4r0mary coil 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 300 turnxabe2/eqx6/s iatqob- / 3u /zs on its secondary coil. If 120ea-q/u/x6//z3o2se bqta bix V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns oaso2cj0p /n*an its secondary coil. If 120 V at *o20apjs n/ac 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 its secix *j/:mf j,s:om hz6condary has 200 turns. If the input cfmcsx m, :ohj6*z/ji:urrent 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 313qii xik udq)65ipoand its secondary has 200 turns. If the input voltage to the 3 i 6oq5qk3)ii1dxupiprimary 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 secondary has/oacwc38j49dq lp zk. 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be 3p4/kajd wol q89.ccz (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 voltage is usually stepped u:.gud vi e(thfvz74m(p to 4500 V by a transf ftvi :gz7h4(.v emd(uormer 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 ,e o6.lt xtra)voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total re)l r. txaoe,t6sistance 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 ; y m nu9qhsh6.z;qlxemw6 +r/ylu:q)60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a lu.q+ y)ruqm;m:9x6zwe/h6 sln qy h;transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A gen6vgfqmho+ d(,7+rd ga4y;eea erator 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 energyehgydd+rmafg+ ve(7; ,46qoa 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 of 0.n;7th.eol;(kl8 t ehe60 W. A generator produces 100 V at 70 A. kl ;nlhe(toh.8e7e t;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 line at 1000 V. H i7egpob38q( cow much less power would be lost if the power were transmitp c(gqi73bo8e ted 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 trke9axmu p 97/segrv( 0ansmitted on a line with resistance of 0.60 W. To what volgm9 (eu9 eksr/v0axp7tage must the generator output be 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 current of zqfp cwv9 o1/we*ydpeb3**8d 5.0 A. How much energy is stored in the coil's magnetic field? 3zwv edyef19oc**ppb d/ *w8q

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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 contaifs wj;+ wv nt); sqa,tdb19gd 5t:kyc9ns a 6.0-W resistor and an 18-H inductor. What is this k,;anc wdvw9tdsg:+ty1f t) j9b5 qs ;circuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit cgghu): *7bwi7 y(cix/nhza 0yy6n r 3where 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- dxyvvn6 0/,ohV 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 1bbx6erv9p k3 the resistance of the lamp?3bpveb 1r6 9xk

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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 cuzx5dos3v.m hnnr-9r: v q c,x+m.e w;rrrent through the resistor? 3:,v rv.-rnw;.hr m qsxenzc9x5+mod

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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 s5krnu 4b79sqcrx f8 )dvq 2it*upply. What is the power dissipated inkxu8 9 sf2vdq*t 4r) qcib5nr7 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-cr;c2h a2u,28vgxthf 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 rejlvq f b1ca/q*4 o9q,vsistor 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 resistor iss nh u(u/l/u32pef*n bi +bnx- $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor -)u9 ek*szugxsw i i9x7gu 4u5at 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 2.4qtw5 y 9)vv g7ydi-wa50-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 havev0g +hz;bu*xv 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 induct/u8 szpl((mz9 f *knrz7gyz4t ive reactance 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 aup/ri()ktkmd a0y0dbgv/2 0 rt a frequency of 20 kHz is applied ttprb2(dday/ g/0uk r)vm0ik 0o 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 wmwp16sm+z+ b qlm+d*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 4f muy2*sx(k t8f9 f 9xri1qq0u.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 needtsm6vz8- i g3med to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a rea i0s( b0riav 4w ine9-fv,vi5tctance 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 capacitive reactance of a 0.q53o/fq,e d loh6xx9tu3re0r 010-mF capacitor be 100 W?lu ooq6x33tdrf90/ ,e5 qexr h

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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 5owh 8+/b))jj8o apagh q. carcapacitor 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 v 6ukf/6)cecy+a-y hx inductive reactance,+ )u/cx vkay -y66fceh and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coilt92p+w8omxy/a uk g5m, and 1.0-mF ca85 gatx92+y mpko/mw upacitor 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 1l9u/ f5 zzz;f3 i/-fypfzww. z500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriesf5fp3l/ ;wuz-fzwzz.9 yizf/?

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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 u+ aq/uz-ne bglzvwdi- fl *+ zn3tpa :94oj31series with a 20-mH inductor, what is the impedance at 1000 wng+ ab :t9fivupz-/d*loe3a 1l 3jnuq+-4zzHz?

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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 i:+kx af,th69v uohq2zs connected in series with a 20-mH inductor, what is the phase k6+ fuhvh: qzo2at ,9xangle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF ca6 m0;ywko.adbpacit;0 d6om.kbw yaor for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with yd wb7ug ntg z3ydwr6047,0nca 100-W resistor and 15-mH coil to get a total impwy4w0uczddn 7ngr,b63 g7 y t0edance 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 Hz fpeg6+,) yxtz ckcu.+ zor a total impe+x., gp te)cz6zyuk+cdance 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 wigal4jzk f *,w3th a 100-kW resistor at 1.0-MHz for a total iz,4jakf* g3lw mpedance 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 connecte t(i(k:(kfmc sm9kkkp186g ni d in series with a 20-mF capacitor. What is the impedance at 10i kk1 pf8i6sc kgm(kk (t9mn(:00 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 1.0 kHz for x6ljvurhx3 h1 l:u7p2(rzdr) a total impedance of 45 Wvuhhxu3(l rr7xl6) zjpr12 :d?

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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 suy7 e9dli1*f or((ug b1ct t,yeries with a 10-mF capacitor at 1.0 kHz for a phase anglfy1l eigo7ttu *,y(r1ucb( 9de 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 resistxkw1ppdda 921 or at 1.0 kHz for a total impedance p9pxawdk121 dof 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 20uyl 8ksf-m a g8j6 aio/0pntseries with a 100-mF capacitor at 120 Hz. What is the phase angle m - al 08ki8ngos0fp26ayu/tj?

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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 150d:.q 2o h rrd0-m1vyaz0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are:1 0 y-qr.dazordh vm2 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 capa9ht/2aetd:0 y nx *qzgojn5.u citor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hzdjtt2n5 o 0yuhg az/x9 *.qn:e 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 reactance 30 W, and avs,z4hb.y+ b c a5y*ppn inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What +pz* .ba spv5b,yc4y hcurrent 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 1g7nyf (tn3nkq y f5w250-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connect1235fky ngn7fqywt ( ned to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W res qu a me5+rzg x)6wyr;8n.cu4xistor for a phase angle of gauqx8wym uzc5+4r6 x n;r.e)$40^{\circ}$ 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 = 10.wsr)enez d8 7,9h i0to0 mF. At what frequency should the circuit be driven in order to have mrz8)7 nse o de,0tiw9haximum 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 yven lc cqox +f;a+gi8;*pr,2 circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power28gn co+rvce; , pfay+xl*i;q 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 ab7 jx9ukg(o rfve6x49 n AC 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 c1jq g8e b0 tr,3anvi3and a resistance of 30 W. What is the power factor?c3a , 0jvbgr t1n38eiq

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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 co 7(ibjpiu a;6mntaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz poweruiai7m;( p bj6 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 ra60f ocfp4.ld ,t)dm a 15-mH coil in series? f) p0odt,4marc .fl6d

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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 spw bkl:+ujm2x9ecmn): v *boefm 6v2 /eries with a 4.7-mF capacitor for a resonant frequeb:km92ofpc veumj6 we )mbv +n*x :l2/ncy 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 needed in series with a 3.7-mH inductor for a resoiogy ;5zibzq u39p x.6on6bs*nant frequency of 1000 Hz?*zsx iy n 3p9b65qoubo6zg ;i.

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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 rei.l5s; 5y+eoatc z ri(sistor and a 40-mH coil if the resonant frequency of the ceoi;yas5zc(5r i tl +.ircuit is to be 1000 Hz?

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