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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are unitr/0 :kt4r*y ctz4okxqs 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 tha g5idw-o5 yww3t 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 lfi8 vt;zlpepw1z+4hk9*ur v (oops of wire in a coil produces what kind of change on the indf;z8rz h+t*w i(pvv9pu4 1elk uced $emf$, 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 9/cva0k )dpo. ef00x dxunic3,xmg8p loop of wire produces what kc3m8uxpv.9g,pn o i0d0xc0kx)/ dafeind 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 produces waod 49pn if36xqr/u*yhat kind of change on the induced x9dn/iu4qp* a63r oyf$emf$, 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 magne0ojg5nj f .yn3tic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the dke 0qy w(h8c6 /rakv.n,7wewpxle.k6irection of an induced current in a conductor will be that which tends to produce which of the followiqve k/7(h.0 wcekawxp6l 6w.y,8k nerng effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abr*s5;mbq+rky r n6u e2ove its center with its north pole pointing down. The stationaq5r6r s+e* bmuk2 ny;rry 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 hori te/ddkws;:hv5dfh6 +,6k ywrcd., yuzontal table. A bar magnet is held above its center with its north pohr/d5h;skdw,:+d, c. v6fy ketuy6wd le 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 vec5 ;d)td fwsln)btxac y-:yn73upm8m4tor points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of thnly8y n7mf t)m5c b;4twadu 3 s:px-)de 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 wk.qo8 *x qo*la region where the magnetic field vector points straight up. The magnetic field suddenly gq8x*k*o wo.q lrows stronger. 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 region where the magnetic+j bytupa u 05:xm/+ni field points straight down. The magnetic field disappears suddenly. When viewx/u5:u+ bynip+at j0med 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 carrixn6 6g;yp 9:jh)oz zbres an ever-increasing current northward. Two coils of wire libp xr;n)z96h j :ygo6ze 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 az+ *yinaccxy38u5ip+/.h,q a d ag2 gg loop of wire with the north pole entering first. As the norta g ih+zup,x+q nyi3cdg5y2ca8g /* a.h 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 r;dwfeby.+t o .fe83qx otated at constant angular speed about an axis whose direction can tw;3qfebx8ey+o. f d.be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be 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 angular speed abdc7 qtk/;i5s ;paa cs5out an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the or pc5act ;as 5/ki;sq7dientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.w:ua e.bp-v 1w1q3zkw
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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 t ;2*cxq 0g 3 fyqch37xi0d dqpyy2i2nahat 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 magnetic fie 8rj*(ss er0 n62nowdhkcsg)8 ld. 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 (org1x t)clzz/ph-/ h)kc iented in the east-west direction) is moved northward at constant velocity through z1 -khc pgc)xzl //h)ta 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 constu dzh.3ghur2r r 7p/m1ant 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 transfc*6r()oi fnwoorms

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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. Theddjiciar afs2n;:6m ; ;0o /8jtej9 fi frequency of ti /fjjnr difja2md8;s 6;9:oieca;t 0he $emf$ 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 u6kdk58( veqrto

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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 devw zk8t/t1: i; wxn6jtfice 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 trg1e var96lnk+13ysqg4q7ty 9d8 ov q han the primary coil tvr876+v19ya ryqdogeq4 t l 9sng qk31hen 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 mo6v f4sikf +; r0ddfxp8re loops than the secondary coikr;x04f d6+pdf8vs ifl 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 i.3 dogcbd;sa6,w-2 ov;ii x jpnput

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant cirk s )xyb9ev/6scuit,

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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 safwqxl:za;(2w2 + dg (holvz8eries to an ideal battery of constant terminal voltage. At the moment contact is made witw fzv+lh ; 2(dqag wxo:z2(8lah 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 induul p/i w9 bjm+y(1wwbu b8tc,2ctor are connected in series to an ideal battery of constant terminal voltage. At wi+ p8bw/cmj9y l,ut (ub1bw2the 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 inductiru13:t 03 slubkvkc5ance 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 rei ikw95uh m-n5sistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time co d u )9ehmf2yk8k(jrfx4tq qs va532e7nstant for the circuit3ux 2k)7y s92eqtfhfe5 8rmkvqdja(4 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 battery. The battery x4pwcw5u2om-h.wxl 4 is sudcx -m2u4 lwww4h.p xo5denly 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 exce8fj scr9xvx6. pt:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the currejgo qc772hk sodp8 *7pnt

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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 cr9z mir2m 9p *kc** j::6,tpv phsptvtonnected to an AC power supply. In this circuit, the currenstcz,pk * r2pthrmtp* ji *v :p69v:9mt

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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 ayz32 d;h06;uvuzs, kcr ltl 5yc circuit changes by what factor when the frequency islzt2 ,c0 s u;kzv;3y6yudr l5h 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 an inductor is dox hpp,nahp eam;-p//;ubled, the inductive reactance ofe/ hp m-,p/;pxnpaah ; 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 aa d1qdlo3 15k-g9 yqpkcross an inductor approaches zero, the inductive reac dqo31l5y g q19pkkda-tance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected topdxw9 3aos igmu 070z+ an AC power supply. In this circuit, the current9ip 07z3+amu gsx o0wd

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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 factor whenb/ze zml 2x5+o okxd9. the frequency is tripledd 92m+ozo /5ezbxxl.k?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the A;1)cw yctwt;z; ez) liC voltage across a capacitor approaches zero, the capacitive reacz ;)yiw t;lc ez;)wct1tance 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 the in*t 2;g q5wxtamxa2m r31msgz(ductor and capacitor in a RLCa msmxtqzxrm 5w32ag;2 t1*g( 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 R0uw)2d8teqikj lv vz26o(zhchw15 4uLC circuit 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. The impeda 96gn5kmsup( ance of the circuit increases if R increases. When is this statement trua(nksu 5g9m 6pe?

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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 impj ej8uh3;mo9zgv6 c 5iedance 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 impedance of t,-t 0j+go h5h 1sh5jzjfec(w5r fp cg0he 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 ctn( tq2 , tbavwh ,7hi:l5o;ncapacitance both double in an LRC series circuit, the resonant frequency of twtl5ct hqon,, 7tnv 2a:ih;b(hat 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 voltage. Ak 8j-a,k lu5ps*oaqua 1q5p2i t 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 wm)89jkahjx wt i60twx8w* 0u xhen

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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 rotat+ :c7e lhnmr8jki4+ pning in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loo:h+ 847nipclejrk mn+p and 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 rotating in a uniform magnettz 1fh*xd5ky j/2nm0v ic field of 0.20 T. Find the magnetic flux through the loop when the 1vn2*x5zht yf dmk0j/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 *f jz9na p7+p:h5x qza0.10 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 vp ph+ faaqz*:nj9xz57ector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced -l1o64n utgrz 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 chan:e0vinc ) w(huges 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 z- /u 05waycpuwire on a square frame with sides 18 cm. A uniform magnetic field is a 5yw up-0uac/zpplied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an areahfyi3n9fo 00 x()fv ue of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and arod)9s00odgq6,tjm cwxp1cx57 w mo q6ea $0.20 \; m^{2}$ 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 horizonta: grv,i,qj* eqlly at a location where the downward componj:q*i,erq, gvent 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 baa3-7tavo--2prgwr p. c yf )xrr that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a ver gp2.- -xvayco3a f rrwt-r)p7tical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has yo5,y )pij1ct50 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 consistwnh,2qo(xs7tu.qxa s3l )9 aos of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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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. Each29.yi ;sajsa;qdo 1. o0zu qwkoyk*;m 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 o; .is; 2k0zyajomu1qk9qdw*;.as yoof 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 1ydo )29 jckv,d5upg3v00 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with ann y;kftft(2.a output of 12 V maximum whf k;f(ayn 2.tten 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 gen b3k; +sks.y b3iry,fkerator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.p v+a)ch (fjr(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 d yx,+)hx+tamx9:aon)b ,wg a2/ esbcoperates on 120 V AC, and when running at full speed it ge a ,x9/sd:abxeywab)ho ,+x+nm2 t)cgnerates 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 :1 z(vtezk;xy (d lnpsjo;i ;2to a 24-V power supply. The opljd1ze i2;zsp;ko(nt;x v ( y:erating 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 resistancl0toi,+v9ye k e 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at feov+k, 09tyil ull 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 6.0 W is connected to a 24-V power su7ei5kmd n* jqt6hiy,rr51 +yw pply. The operating curre5rr ni yje+dyk h*7 6qw15itm,nt is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a piw ya4 c5*b1dvrimary 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 to flow in ta/i v8k4zrtw8)ig f;xhe secondary. How many x8)gkft a r; /zw84iivturns 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 8o;cmmafqyv ))po; 4 lturns are necessary in a 110-V primary if the 24-V secondary has 10))8o;m;4mvpacl yqo f0 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-tu;sy qs.yu 4/q7 z6vfdjrn primary coil and a 2000-turn secondary coil. If the current in the secondas /ufzyy4s;j. d qv67qry 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% effokm+as8:eia/ 10qhx yiciency, how many amps at 24 V can flow in the secondary? om0y:a1s e h+/a8iqkx

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides q kbirle (58jlb 2pc;+7500 V at 10.0 mA. The primary coil operates on 120 V. What does thl2klr 8i5b;qjp+(b cee 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 tur4 n puv9oufr)8b4s(n kzox47h ns on its secondary coil.uvfn(4urozk sh4p x 4nb9o) 87 If 120 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 36ikukdsg, 8z52o. p jcgs 7)tv00 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is prese,c68 oss7 g2.vg5tkjkpiduz )nt 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 tup/4z/2caete ptvd6 :l rns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expecttzcp 2v l6/t:4 eap/de the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. 9x s7 3+-0yoozc72iaq s uliogIf the input voltage to the primary is 100 V, we can exu csi-9 ao oy2l37oq+70iszx gpect 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 200 turns. Ifsk bs8,x+m uh* muxk*,+s bs h8the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60/x b 6 fuddd3hih4dc11 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primaryb3fxuhdh d1 4d6di1c/ 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 st4qj bsvmv+f:i3 w1/e xepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find vj3 b 4:xsfivw+eq/m1the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usual n;*h, 8vqi jd.c klur,o4lpw9ld3ns *ly 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 transmission line if ; l u,ld83vdqj*i kcs*p9r .,lon4whnthe 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 : snhfepi*x/5f,x f)t W. A generator produces 100 V at 70 A. In order to e/ *thpffxxf ,isn: )5reduce 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 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 toae m:;,2tb g/ oxl;cwjlvc,1dtal resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating o;ld,ve:;alo/wx b tj2 cg1,mcf the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power would1n /obzg6gmrj7m-z rz-b2l1j be lost if the power were t-bgom117j z6lbm/ zgrn-zjr2ransmitted 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 transmitted on a 6v0z 4 ew6sqrj5t ym6u*y b)tsline with resistance of 0.60 W. zqwb0e6v stry* y4 jm56 ut6)sTo 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 of 5.0 A. How much energy ie;o3u:lnao (s s stored in the coil's mae;:nuo 3( lsaognetic 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 resistor and an 18-H inductomn.ii b2bf13i r. What is this circuii21.minb 3 bfit'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 rms volh:iv1k 8zk; hwtage 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 outle q63 fyva.jt6et. 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 int+4oh16vy tmg:y fs+ki-- iteyo a 120-V AC outlet. What is the resistance of the laft6 :m+eoy- +v1yii tg4-hksymp?

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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 powereta)3 8iefh g;r+9(zhj:pq nv supply. What is the peak current through the resistorzr e)igv(nhqj3a tf 9eh:p;8+?

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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 i:xyh3db-p )o a 120-V ac power supply. What is the power dissipated in toy pbd:-xh3 )ihe 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 xr3h e2z1x fkm12oz- )ce7tlg 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 resist 5rboq*0 u8jfw+h ia4aor 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 resistb+ yi08n(::5ufe edos wwrd;sor 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 indc( /(f:lw.2 eirckcn)iin 6tguctor 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 ate 0a f8ldu07 n-kz3ifj 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-meca)j ssl ,)n*crxg9( H coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 1000 p() ooze2s7f/7mexcmHz?

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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 inductornz9 e67q.uzkrd3wv2 p 4qt rg8 when 120 V AC at a frequency of 20 kHz is appu z9zwekq8 tpqd34. 6v2ngrr 7lied 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.g4e bei+w mzq0:-gg/ k50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a . mlz :62nlb/gg uqx-e4.7-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 reactance at 1-eyyy1o3pyh y;ddzawo5 3)q +0 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 23.s7awq /pek+wbl5 f 4r iogka 10-mF capacitor have a reactance 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 capacitj8;8)qx2 xf- s *tddcjgm 0fsbive reactance of a 0.010-mF capacitor be 100 W qt;fdf*sxdgj )82cm 8bsx 0-j?

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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 thgzcuq-476a-mc aon ngk,- sr6rough a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac7tz)81g8 g6 nep+9 9. o -vmxcnvj:hifzsukxo series circuit with 12.0 W resistance, 15.0 W inductive reactan6sz9e: gmf8 nj8o tn-u 9gck)+vh.z1 ixoxvp7ce, 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 tlad(ng 7 tg5 *l2fdy+if a 100-W resistor, 20-mH coil, and 1.0-mF capacito*fd l yattg(l 7+n2g5dr 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 angleelxffsc2u++ w4 9170wk swztp at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are confx19p+w0e ts lu2+kzc7w4 wsfnected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is the do;6 oond 72/+rrut, j xhvf3qimpedanuoxdvjh 7orn2 6+3/oq;r,ft d ce 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 isd8h* nft16x7xsmh l/n connected in series with a 20-mH inductor, what is the phase angle at 10d /1txn*mh fn67h s8lx00 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 neehe 37+sm kuu2zded in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100e73uu2 +h zmsk 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 9/pdz ntwnw)/in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at wwt 9 /zp)nnd/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 4 ye i )elns* ,wlsq3cf :y6alt1.gn+o550-mH inductor at 5000 Hz for a ton6o+cw5ynlg l qte iys1e,*.)a ls 3f:tal impedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for a9c/ge v ws.*vxe+x -kv total impedance of 150 kWx+vgkse v*.cx-9ve/ w?

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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 i6bka,aiwbxtrbv ) (;/n series with a 20-mF capacitor. What is the impedance at 1000 Hzbi 6a;a)v wtbk,x(/rb?

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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 1vs) (3i0h jdap0l jf*l.0 kHz for a total impedance of 45 W?p3a ihsf)0l(jd vjl *0

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is nee2yb pmc2v m7k/jf v sw.d1y7f2ded in series with a 10-mF capacitor at 1.0 kHz for a phase vy j/ym.wk2 vmf77p1db2s f2cangle 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 ne kh y7u-dka8 rpxs9g9*m-l6 nxeded in series with a 30-W resistor at 1.0 kHz for a total ksr-xhd gl 7an89y*u- 96xpmkimpedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is i*ed 9me(cundj .t xz45n series with a 100-mF capacitor at 120 Hz. What is the pha.xjeu*ndz59c( et 4md se angle?

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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 +f17 2svv-lz3kz.,ydsm,t)h1b/ivyiiqcp v a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connec+) svqi/, 3ivstvv7kzpf1hc ,l 2bimz .dyy1-ted 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 co p 7b:/nugxtvs.23bdm /e9q wknsists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms currens7:me. b/tx23 9guvqk/d wpbnt 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 capacito2 ome gpg45hss8:x 46i9woc abr of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. Whag4 5 weosc2:hs9p6g xo48 aimbt 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 vdb),mnv3petqg y4sfk .+ m42for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz po k 4, e3pfb42tym mdsqvg+nv).wer 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 5k4o el0fp+m1x 00-W resistor for a phase angle of ep 041ok+fmxl $40^{\circ}$ 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 =7m o n ,5fg,kv,czr:t/fyaq e6 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transf kyce/m: fq a,tnf,go75z,6 vrerred 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 crmkz. ps7re;2l; uryf*pr (1uircuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the*pryl;. kfruzm ;u1r7( 2rse p 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 circuit i4f::57ah p5qxl 5i 2figqg dnxs $63^{\circ}$. 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 eq9 w68 91jd lsaef.s c85xs eti.q/mzW. What is the power fs9awxe tdjlis1 8 9685zse.q c. /feqmactor?

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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 resiy.rk1ht4c 7g 61 tcpj ld+k0xastor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a x0+16 .p ct1lkgt h7akd4crjy60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and x e0kw h4w tgbaay;zbs+2+z5v hx g-.0a 15-mH coil in series?4a.05 yg ;xh zazge-2w+wv 0htskxb+b

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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 res2f; ja/z4 bj5pgab. nzonant frequency of 10 kzg 5b ja/af4 jbz.p2;nHz?

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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 fortl;ekh/-bb( t a resonant frequency of 10 lt(-h;kb/e bt00 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-mH cqgee--g g*w0coil if the reson0g qgweg-e-*cant frequency of the circuit is to be 1000 Hz?

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