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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 unit(a-7:k xfn tggs 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 induction states that th p)hn*qkr5/dcuy 2/cegw (x v3lv7w+b e $emf$ 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 e1ri,l;kz4::-uocqn2k7y+ sn gowq rof wire in a coil produces what kind of change on the inducedr;k, 4osi-w :n2cuor1:ql q ye 7zng+k $emf$, 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 tmc .8g r8 j* :*jvvpy :kcucda7ag99gahrough a loop of wire produces what kindag:c8a j7ra vcmp.*:ydj9g 9uc8vg*k of change 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 pro3a0dqids 5aog 2.znz9 duces what kind of change on the induced 2d5a.d3anos9q zgiz 0 $emf$, 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 anrz6+en4lkj- .va fvzi2c mm 9u9edqgk3) d+:h $emf$ 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 la0n d) p 6s xq*3sps2.lrps/qigw, the direction of an induced current in a conductor will be that which tends to produce which of the following effectrs idgxq*s3/s)p qsl.p 2 60pns?

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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/ 9bac8zx,vy2yax( gi flat on a horizontal table. A bar magnet is held above its cxi 8zv( 9baycxg,2 a/yenter with 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 onks)m 10uv-m+ dhlo7d qla5, bw a horizontal table. A bar magnet is held above its center )u1vb -mmlkqoa0h57ldd ,s+w with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vecto5mf .x).t x+enb8 cdfhr points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current 8xfhxd .nbce)t.5 fm+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 tcrdtqhkm i9 z4.;-sb0/ qy+ea he magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increas4k 9 /;qrc+i.-emba0t zsqhyd es?

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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 magg neo8g+ (x7l2 ugrgyi(8lpp89mc i r8netic field points straightli(8 8m exgl72g ror+ npc89 gui8gy(p 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 horizontal table and carries an.89qc j;tjn c(dlu0 cc ever-increasing current northward. Two coils 9uctcj(ccd.0;jq 8 nlof wire lie flat 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 loopdo-(gq(;k2 rktn d(rz of wire with the north pole entering first. As the north pole enters the wire, the induced current willt(zd (;qor2-kkg nd (r 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 speed about an 1e4 yztud fv3;axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation; utf3vdz y4e1 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 r0gsx5 f5z cj, forl0h4otated at constant 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 axis of rotation iho, rj5g0 cxf4f z5l0sf 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.rm x(lj*op*7y 9 tviu ;/lu2yb
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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 wb .,8 wb2lzciqd (b5tan $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. l ky dfj*0,4*rjmaq(zac2 k0l 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 direction) is moved northward at cony hvz d i5o,8+7a hn3vpdmtf4d2w8ly 7stant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across t vdn7 48d+7f35mld2v,hiy8yzahw t pohe 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 bar0t8fz l*0ug ee4 al.pw rotates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator tranv ;mujc) m19ft-x yj2gsforms

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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 second. The db lanyn0x1*- j3(xwkfrequency of t ab*x-(ylj 30n 1xdwnkhe $emf$ 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 used* yuy5qjs j*;f 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 dqykm2*/a*qqq4v shl 0/1u af4 y +nxctevice 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 ui5gwu7g0 b j5xlb0oc,q92ht the secondary coil contains more loops than the primary coil th0x,li 5t9uw 75bc gqgh o20ubjen 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 //u)ase ossfm k-lv;-secondary coil theo;/-sum k/v)a sse-fl n 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 inputk:jelesi 6d,.m cs cs1q3v31o

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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 resona0 c c c,bb+j+moxbxz/7nt 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 battery4 kxr8uwnt;p-(f, pxk of constant terminal voltage. At the momenp-;u rk x,w nftx4kp(8t 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;ct /mj hyekmse3xm,hc /y (.- in series to an ideal battery of constant terminal voltage. y .eh m /e;cc,3yhm ksjt/mx(-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 inductance0s n)j3m s(osqm l)(lr 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 resistanclcc +.vqe, 0xke 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 batteryi,dp how-m un(7 ,huv.. The time constant for7w-hu o ( i,vhnpd,u.m the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a batte o7t:kzfsz jnzu)u00(ry. The battery is suddeon)z7zkuj t0:su f0z(nly removed from the circuit. The time constant for of the 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 units excepaj7e-wzm *t j2u: t)*wlpz6gjt:

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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 w), x9tacru, pww4i l5circuit, 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 pop .p(6qeyx ay ns0t48i14 vwcbvpu2w8wer supply. In this circuit, the currenbywt ew044p 1n8isa puv 2q.y(x6cp8v t

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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 freb-+ ityj5yg9i quency iibi9jyyg5t +-s tripled?

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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 amn1jtg)g+nf/ hchd9 5n inductor is doubled, the inductive reactance of t+1 ht n/fg)mh9 jncg5dhat 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 induct1iw7/ 6z q wl j)qrlvyip- rek,92fk5por approaches zero, the inductive reactance of that 6)l7wj , rvrwkqk e2l-/ip1q95pfz yicoil

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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 a*si tm. zps):wn AC power supply. In this circuit, the current *)w:s.spi zmt

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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 changeucw(qx51.nj 1)omu b4+u6 6l hpi3 tmccn m-sks by what factor when the frequency is trcisx.n 5-c 1wq3)ukob614cuj mn tm6ulhpm+ (ipled?

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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 ptpn 2- zmrit(9/ck8 *u 2yonwa capacitor approaches zero, the capacitive reactancepr2 zcui9mkt pn (-2tn8/woy* 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 angle between the voltages of th mclb5oiw 0 4o.l5vmy-e inductor and capacitor in a RLC seriel4-5m. m0owoibl vcy5s 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 +s; ytr z8dhin db,tq2d(,6qa 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. Th4ngp 4ejv6ko0bz kw86e impedance of the circuit increases if R increases. Wheo46 kke4 6bjn pz08vwgn is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The im (3vge6p2rh. jshjt3m pedance 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 c6w03qbdp9uh m ircuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC seri(v -n.ss (i;ujz*bg,bi p5omx es circuit, the resonant frequency of that circub im x;- 5zbn(o.( g,*ispvjsuit 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 thaty*h/g) jeyewk.mt.3 m *8yorz is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit6+x uxr 3g.mde*loro5 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 unifo.u4iyy8s)cd i rm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop uy4c8.disi ) yand the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotja c d540f)krrgk,7wiating 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 vectkki5,j4c )agr0 r7 fdwor 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 magnetic field c/v-ezrm uou4n1j).wda(y c/ of 0.20 T. Find the magnetic flux through the loop when the plane)z4j ( -o eav/mucw 1/cr.yund 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 t tju37uw2/ue loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changbk7n, uc(5kx ies 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 euz:- tqy f0qh*b* yg.cm. A uniform magnetic field is applied perpendicular f uqb.g yt0:*yqez* h-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 oh.u4tb) lrqj)x 4oj6 hb+*xdturns 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 v tt4/xapbl5 +q6qxz +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 * kp+5 iqvl-fef1j2 yan-m9 aqspan of 60 m flies horizontally at a location where the downwapa 2q*jla 5eknvm1f-i9qfy+-rd component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant z0c-rg0)m6su9 lgaco angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a cong0 zr6m)csu aogc9-l0 stant 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 genera6bwjd dnd*e 5+tor has 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 100c-ol r0,x ib1hj9 qt-z 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 $emf$.

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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 armature. Each lou 0+lt-ei hfs4op 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 perpendiculareftu-il0 sh +4 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 turns of wireyfw)f h--cd-ga 1)ptw 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 constructx7k t(en7rx,1lj+6hsfs k us: a simple AC generator with an output of 12 V maximum whe6hs ,1:kuel s7 xnj+kxrsf (t7n 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 generator with a maximu/b/xjo7/w eqn m $emf$ 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 ha6mfjs0l 2y9 emve 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 6.0064z bdlw ei;ulx*.j9: lutbi/ W. The motor operates on 120 V AC, and when running at full spe.l b* xw;uel bd:i69z uji4lt/ed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is co6ga de .c7 hph bxr:a/i8j/ep:nnected to a 24-V power supply. The operating current is 1.0 ee8hrhdj 6ai 7p cg.p/b/:xa: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 resistance 6.0 W is connected to a 24-V power sa*og7)l5gp4+gf/xj1 l oa cy aupply. The operating current is 1.0 A at full speed. oxay7 a/g po5f+4jg1gallc*) What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connecth 7ho7wg3uf3red to a 24-V power supply. The operating current is 1.0 A at full speedg of33w77hrhu. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a p4+rafhz,k* 9lz / dh;mx*pcvwrimary 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 ha ;n4g4devs h7u0pb.vkt h-214 A to flow in the secondary. How ma2tu-4h sehn pv gkv740hd.a ;bny turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if)ua9 e xmqv9gw.kvq70 the 24-V secondax9.vgw970aqm ) ekvu qry 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 5yt5 hd a0s q5/5my6sxk00-turn primary coil and a 2000-turn secondary coil. If the curren d5qy6 kh/a5t0x5mysst 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 100% efficienci-c9jl, wwp +qy, how many amps at 24 V cc9wlj p+qw-i, an 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 2row/m v/8 fesa neon sign transformer provides 7500 V at 10.0 mA. The p/8rmov2/fwes rimary 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 3rk6e+, yhto5 2 vcdbn:00 turns on its secondary coil. If 120 V at 2.0 Arbdhek+ ny,6 toc25v: 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 turnvj: 7(f8i16 g 0bsdgvo .jc fcroau*a9s on its secondary coil. If 120 V at 2.0 A is applied to the prij(sagoi uc69r ojvd1 gfab7cv 8* 0:f.mary, 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 secondary ha 1:: llpeptkx)s 200 turns. If the input curr p: kxl:)tpel1ent 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 8v so0 u:p a7iow596lcm7xuarhas 100 turns and its secondary has 200 turns. If thewo87ua 5 sulo c9rvai :07xm6p input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 10*ocp4d)m tlexbl9): l0 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secon4p:dc)tmlleb x l*9 o)dary 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 ,x0cs7 +kqx zy (yq nvf 9gr/)kuvh-6bcurrent 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 Wr-q/u+7, fbkvk qg0cz 6sv)h 9xyyn( x. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steppy0q2s1l i1bfjed up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentag110jq y l2sfibe power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is ux1 + cfnjs.+ep tydq 9q0e(va*sually stepped up to 4500 V by a transformer and transmitted through a power line of total resis0 n.y+ etes9dx+q cjpqvfa*(1tance 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 resi6 hudlr+r1w:wylc3u9rp/b n 0stance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a d1l lr/6rwub+9c 0hu3p:y rnwturns 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 o:hl :jxf/y8 to3re+l ff 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percen:jy+ r8he3:/ ltfxo fltage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less powem 1gjbg,c b2rq nfr4j2 o(bi81r would be lost if the power were transmitted at 3000 V instead of at 1000 Vj1,icq4 g2rg2b(8rnm1j bobf ?

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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 ru4ti7 w3u y,nlw1a6p A. It is to be transmitted on a line with resistaapn41, iwrlu36t7yu w nce of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of 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 of9uxy4 xk945am tvvk*d)po r k- 5.0 A. How much energy is stored in the coil's ma v4oy*kv r9t45)-xx9puk mkdagnetic 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 ac f6n jr y5*ape 2o:huu;w3pl4 6.0-W resistor and an 18-H inductor. What is this o 6urj 4 ;h5*plf3en:wu2aypccircuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rm texb gj f11k+clr6f nyr)r*-r +r/j)cs 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 is u: d8jolg,2kcthe peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of tj5 w76uxqerl 9la*.bm jjb(3xhe lamp?xl7*j a3bm6ju59 jq.x erblw(

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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 2 kpnl:d4k.prc:bc x ,-hf l6xthe peak current through the re,nxrh6fkc-b2cl. p4xl k :dp :sistor?

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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 powen 39fdr8sztrl/ 27pagr dissipate8ar2s7 zndf 3/ tlg9prd in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resisto(w2 eq ;vek /e-z9pq (zmy/yyxr 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 50y6r.snjb.:4jll zws vn z57 p3-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 ess-/i0:sr g*g g(wg*4xyl xtresistor 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 inductor at 60 Hi kqr,+9 mx9szg 1/zgqz?

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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 c(mgss+/( dmccrb(f 6z:pu.h zoil 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 ov;y-,c4bez ryhy3.vg 1m) wde;x:tj v f inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 10000gte woa1 ia+2 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 inmlaem5(k1eb m9g be).fwk ) s7 a 60-mH inductor when 120 V AC at a frequency of 20 kHz is ab1 mg(5sk.k eewab f)7e9)mlmpplied 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 t5r0am6c)7i/.bayv obz b4esthrough a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance og)w:87 c7a6w umdgpfz f 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 reactancevwc*k iay,3x-8x (lug 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 dkhyfk s0 z5ybuh36ez4fv0*+ u0 ps7bof 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 0.010-mF)c sm /sg0jfm7+ler 0s capacitor be 100 W sj sg0 lm+r7ems)f0c/?

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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 aw 3n .omzr0,sa 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0 W inz *w3:9* omg qaqyzsc8ductive reactance, and 10.0 W capacitive reactancocgqq z9:ma8 y*sz3w *e?

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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 impedancmb kx0+ne 9 e5 k2ofqw4b j6ny9m.q-dte at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor arnd49-ky6n oj wm29k eqfbqb5x0.e+ tme connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF 91 /qglv2rwyb capacitor are connected lbv9q1 2ywrg /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 se.ki hkm- v(:b e6 -hv1tsysm8cries with a 20-mH inductor, what is the impedance at 10008tck vvsm.hs(i-e b6mh ky-:1 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductoy ,oq:vdm9hc ./j7cvu r, what is the phase angle at h9jdvyo .,u7c :mcqv /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 a3 seey:rmt j8o; x)hq1 series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedane:ye 8 to3m;)1jqhxr sce 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 wiyu+esk-l f2 ryglb21*i 0aw d:th a 100-W resistor and 15-mH coil to get aysdfi r+21:- lgek2au ywb0*l 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 *z9:crul4v 1 cr zno gj7v6(wqput in series with a 450-mH inductor at 5000 Hz for a totc7 o grj uzn(*w v14vl:cqrz69al 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 gh1 6 )iubzf*ob cu)t3bxu5 f2put in series with a 100-kW resistor at 1.0-MHz for a total im)i1 *o b5b)uf23t zfbhu6ugcxpedance 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 capacitor. What is tk5t a+)in 6kx:.osax yvqci(2he impedance at 10006k.a )5 cts:ykxoq+va( iinx2 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 nee+uxx)sk* 41bwh6s8jd ch qh 9kmi0x k1ded in series with a 10-mF capacitor at 1.0 kHz for a total impedance of 45 )s k*81ibmk u096xdsh1xwx +j qh4chkW?

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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 1;xf*zx4y c8 wf0-mF capacitor at 1.0 kHz for a phase angle o z4;ywc*8xffxf $40^{\circ}$?

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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)o k// u+swmu. ggpt2d a 30-W resistor at 1.0 kHz for a total impedance of 45 Wgg). s/ 2udupk+t/mow ?

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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 z w 2z7nwaq./ba 100-mF capacitor at 120 Hz. What is the phase angleab2 .7 znzw/wq?

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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, and 1.00:q16 -juakcioq qj- rlxg7 7t-mF capacitor are ctq1okq0aqgjj xr -cu7 -:6l7 ionnected 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,y*q5g2q:fd)5zs t )d y9macge a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What qdq )*gmys9f2gce)z5 tda:y5 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 reactavf75. xk1tz .r rp:nm+cs sf7pnce 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power svs :f7 r+1zkp7m tf.s cpnrx.5ource. 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 RL pgmtq6;9e 0ba* -tcstC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected tobctm*e9 0 tas6ptgq-; 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 resistor for a phase angle ( jn6 5winwjgs3 :ij kf7vy+r;of nw;6g ji+5v7wyjk3nsjrf: i( $40^{\circ}$ 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 = 10:3,e0:-l ulf k(bhh 5izsmrdh .0 mF. At what frequency sho-h,he5u:l3zim df0:b rsh k(luld the circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit7yx8:hlhl pww 5z1x1f,6 uwia with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 xlyf 8ax:zl56 wp7,i whw1h1uW 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 circui b2e s ltwuesq830jd6.t 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 impedai qq6t:t6j;r gj 07 ll3j,w1bjjtm, ydnce of 60 W and a resistance of 30 W. What is the p;60:jjli jg3tr1q wb ,m,d7 tqyt j6ljower 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 RLCq1tu ),mtf:c/zixl-bt w+l+ p circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.i +twl mcxqt,ubl :z- 1p+)/tf45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor anl,; *dbag3h ur*xm.w /klzx jt r92fg/d a 15-mH coil in series?r /zmlx;.wkrutgal* *9/df, 3j2bxh g

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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 capaucsh/*3 *tpmd citor for a resonant frequency of 10 kHzs3*/t * mudchp?

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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 wii j-h khdvot .a3c9b/6th a 3.7-mH inductor for a resonant frequency o jtikdhv/.69-3b co haf 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 resistor and ve6z4fq (j,x9 lrb p8nbu ).zfa 40-mH coil if the resonant frequency of the (4,z8f )lpuvj9ex rzqbbnf .6 circuit is to be 1000 Hz?

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