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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 2lz d14qz0jliunits 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 the3 v / tkrv18ytoal+-ga r54sxhenm 1e: $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what klx1:fm n lqq, w3rxo+/ind of change on the induclnxlfq,m qo 3/:1rwx+ ed $emf$, 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 magnq1.(ozukf q n)etic field through a loop of wire produces what kind )uq.fkq1oz n( 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 ;ir : .d2zvg/gake xtg2/rh;wof a loop of wire produces what kind of change on the induce:xd; a2ki g/ t z.v2r;gwer/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 magnj7d2rbo,ol7 bdz8* p ketic 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 directie y/ze.uv.g sd)o).n gon of an induced current in a conductor will be that which tends to produy)de/n) .sugv oz.e g.ce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held 1s k u 8zsr0;7yh4pgutabove its center with its north1u7ssuhy08 k4tz pr ;g 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 lsgvpk:6o e ,jv9c7y )d3c.dj magnet is held above its cenv o)lg3j:.epyk6cd sdc9v7j,ter 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 k *a,tj54m60gvg(, i.fl sl .tkxxtvdmagnetic field vector points straights4 x.,tl .k*glk(jtxfv gm6 v0a5,dit up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnevclt s k(pc9+ed+13m xtic 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 ts+pxv 3c9+k1dm elt( che 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 regionwf/5. rav a .f2xj2 td)zcu-yn where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappecf5t2 /. n- .jy)urxwd afza2vars?

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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 ever-increasin22 .6tzscl 8z /yjmrn6d sjwx+g current northward. Two coils of wire lie flat on the table, onzrsy t +xlzjm.cs6dj22w /n86 e on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering first. 15ch jm)y 9dth As the north pole enters the wire, the induced 9j 5hmy d1hct)current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about ank+zm-g.0 zp/t; 4sur5egco fpbu6z c. axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induce zup.zbczs5g+m0u4 rk.;p go t6 cfe/-d $emf$ 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 an.z5u8u6s(yad1 bw jrvgular speed about an axis whose direction can be varied. In a regia1bv(u5zrw6 d 8yju .son where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.etwzr;/vdsa7zuc 6 /r ;z0j: n
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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 ar7kj* 5ssp id/n $emf$ 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 ltaam3 we()l *:r.gjv a magnetic 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 (oriented2gf abn2 sknu16gd u7, in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statenu6 1 dgg bu7asf2n,2kment 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 constav+rg:ahzy 7 z0nt 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 generatornbmp 6zm1 rar2.n- ey. 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 rota.gipvz2 ,(11e nj mexates through 60 revolutions each second. The frequency of tmj. 2xe(e1a v1ngi,p zhe $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a de-fxc5 1xt-b .vns) upqvice used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a devicepbkb dw+l6yr tp+/l/1v5v0nu 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 4o, *zaq.xhlgcoil contains more loops than the primary coil t.4qz* x,ghalo hen 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 tz yeyt87b-.b rx 2yfhle*r)8xhe secondary coil then it izxlf88rxtb2yb*e7.y-y h)re s 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 l*tcf/at;boqu s uy;i z4+7 (ipower input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant ct qqn8jze *3 ,mt2hib6ircuit,

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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 connect9lvvv l s ozsn1v y;z87,id4u)ed in series to an ideal battery of constant terminal voltage. At t z7;vv98ulv)yd1 vssni,4zl o he moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal batzv(1:e2nr*o smmxqd7n 0.i s itery of constant terminal voltage. At the moment conx1m *d.i0:n7rvi(smq n2 soeztact 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 resist: i1ar+csc z:xxdjd3*) /e9tb o f(fmrance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connec:ibcc g +l,2p3mg n+mkted 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 battnilk-mbbd33a1o;s-qwesa r94 vc+) s ery. The time constant for the circuit reprbc; sv4din193q3brw +osa- kes)-mal esents 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 i ze5,r/d 1hxuto a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represen ,dur1ehx i5z/ts 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 unitsi oys6u. 4u8hi 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 tnwg 4y1w8njj ;his circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC s. 83ziujk a0 +;av ih-af0noypower supply. In this circuit, the current+0o z;8nks3.av0j u af-ayiih

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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 2 o k(,hcsec,qan ac circuit changes by what factor when the frequency e,(ocsqkch2, is 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 arar hvi33e*uh/, h w3lcross an inductor is doubled, the inductive reactance of that inhlwr3/a3, i *ehruh3 vductor

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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 volta7q7rnsr8ip /y l*6jet ge across an inductor approaches zero, the inductive reactance o rq7e8sly/ip*tr6nj 7f 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 to an ACzlm7a +n 2,wza power supply. In this circuit, the currenz 2+ma,zwna7 lt

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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 circuiv2w kfn 23- pi/fsar4qs 1 o5ob,rzbh4t changes by what factor when the frequency is 5b r2,fwi4rs za3s2fph 4vqk-obo/n1 tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero.k:*8gz jx tds, the capacitive rzjxst*. d8 gk:eactance 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 anglez e7* i2wrf30mf,yjyc between the voltages of the inductor and capacitor in a RLC seriecz27jy,e*mf fyir 0w 3s 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 c:dlc n-x ubx,;ircuit 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 impedance vz e7a3lwi s2loph, hh:gur4zv6;b5;of the circuit increases if R increases. When ,ezr5s:g2o; l4b;zh hil6ah37vwpu v 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 impedance of the circuit increas u:j.9lw3sm vzes if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuis;g01j q7r3kwws 8: tl ox*qjyt 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 bothv:e;6deth k w* double in an LRC series circuit, the resonant frequency ofdve;t*w6k :he that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is drivenc;r1f i;* ayjr 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 circuit occurs wnj v5(dz 9qa,ghen

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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 i(ysm ,yrmqw /zy91, /d(hu gvws 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 vectomwyq,dvwgz, /(1y m /9yh(srur 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 radi-ghct svm 138hus 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 csh 1tmvgh3-8 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 rotati isk0 ada.e9-:wskrb 1z qe3j5ng in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mazd:.95s 0ik 13webk rqase-ajgnetic 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 amxi .(8l .vjtazff,m1+kso o+n adjustable 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 coil ch- z(xlcqtc/-4ii x qv9fj3i4 8wparxds 0g6k+anges 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 ofpe8 *v:hooe.p wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T pee:oph 8.*ovto 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 ae-abc(a (c(hdnd 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 acl.gdd7 w scr 0j6d*.ond 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 mpqrmh oe.9a /d (q7xk7gz6b j: flies horizontally at a location where the downxjpag6h:e/zo7 7 q.k9m dbrq(ward 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 b 5pr;h3v w+fq j//hye04awhvnar that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of qhf /ev;+vhpnhr 5/aw30jw y 4its 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 (ym8umj .31d h+yfdbu 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 o(/8lg kw fuqp( j(/kjmlfz+cs9d3 vdpz8n.v + f 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 k4+cd,klyesnq-v5 zm7)2l qs. 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 perps27 l,vnde)k 5klcs+-qy4 zmqendicular 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 ofex zq/i9*/a,u eh k*w hg-gq:m,kcqo7 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simx c2m8y 80xwp.4;bzri2q wt0f(wotvi ple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is 2y4b08z cwfwv0rxt2toxii;pmq(8 w . 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 maximumo z:prmv,ql9va d v)9- $emf$ 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 6.00 W. The motor operates on 11gsz(oz 0*nyo xup:a$120 \; V$ 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 ow514m0 (bj437 iymxek bjqx fnperates on 120 V AC, and when runk b ni4xxw4( mf0m ej3b7q1yj5ning 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 resiw-,hrtd:r+ w8f kke6v sqnpmf. 8++1n;woyanstance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A.e8fnyra;m +fw, wd1:nr6snk-tqk+. 8p h +w ov 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. ;a. sps.uk2s/s tw1jh0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. st/s;jpha12uwk . ss . 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 p;y ziv-c)st:sower supply. The operating current is zs:- iv)t;csy 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 reducvc1 m/* q41 ) h9v,s gzgptmyaejren.(e a primary 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-tur m wsn9e6;g/42u erg2dte kn8vn primary of a transformer causes 14 A to flow in the secondary. How many turns are in6g8devest 2wru/n;49e m2ngk 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 turnm.r4w ,,w 4 shaaoslokx 5r6h,)bdi8bs are necessary in a 110-V primary if the 24-V secondary has wasr a4h, dr5wb 46l)xhb,oio ks8m,.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 5rfj fyg0 ;:,ljm.-hcs00-turn primary coil and a 2000-turn secondary coil. If tfrfj,yjm.0: l;sc-h g he current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100 03/3)ls5 -asgskej, ryxokjd343 ahipga)rc% efficiency, how many amps at 24 V can flow aas) ig-5s33ry 433jacekx,hs j0pl)/ odk gr in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 750r - jye;(4w(e*8fjd4tj 6covau l:qza0 V at 10.0 mA. The primary cjdfcev4j ( ozw6-r* jy;lt4a 8uq(e:aoil 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 hastwkc:akmn0h c-6l 8s 6 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondkkl 8mch6t6s :0awn-cary?

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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 coilvpc3b qbs7ox8 (yw00 b and 300 turns on its secondary coil. If 120 V at 2.0 A 3ob0wc (pb8yq 0s7vbxis 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 hafy z+5lp4)p ixs 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A,5l zix+yf4p )p we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary haw q1 5id sswdxf1m; )mic;28bqs 200 turns. If the8wqd2b1w)iq md m;;1 5sci sfx 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 100 turns and its secondary has 200 turns. tkoi wxg,w+38t/ ph7c If thet/7itw+p h o cwgx83,k 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 A of current atyz06aw ,avjo 3 120 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 ty0 63oajwa vz,he 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 voltap-ie:. d , y0uabt7tcfge is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the u0p aidf-e.t:c,7byt 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 rn 0,)fovrh-b gc+lq*V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in th)+-*nrl,bhc 0g rv ofqe 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 lon3 a/v5an gol4cj1s zp0g has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a tra5jc1pa0nszo34a lv / gnsformer 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 liwkf a7j- 2eqy9zc*e2jne 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up withye 9we*a kj -j7q22zcf 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 would beq1juby -y e9 w1xdy0o. lost if the power were transmitted at eyj1 o 1.x9bwy0dq-uy 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 generarg34/9tyy1w xe yps jhu j4/y(tor is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator (/yy3e s9 yw1j44gr htxyjup/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 curren,fl9a3z neyabuu) e v6 i*;wxdt2 p72kt of 5.0 A. How much energy is stored in the coil's magnetic fv9ae2di2uyx ,el a )zw;pknf 3t67u* bield?

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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 crh*(o sd0gt3 .txgbzz ;-q bjpw u1)7nontains a 6.0-W resistor and an 18-H inductor. What is this circuit's time consgtw; p*-j.sbtngu)1 dzxqbr z 73 h0(otant?

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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 vg+ 8: m: e 9-vreppey7ie(wulaoltage 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. Whataes 2tgv5t/11 9 hhofh 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 tbrpu 54w93qy.;b3th 5vckex3a,b mpthe resistance of the la y 3ab3p5kt9w r,. qph3me;cb4b vuxt5mp?

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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 connectec q c 9wwdh3a ijnpe2(.82s6pwd to a 120-V ac power supply. What is the peak current through the reseh d8 qpc(aws3pc j.26ww9ni2istor?

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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( 5vfneaz;6 q aeu4w)i is the power dissipated in;n(vi q6 4efwuzea5 )a 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 5 xg9h vym7.,rn7it8sqc kq+ r:0-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 residgrc5au+ rzsslyz x//v ;+ )k2stor 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 5j4s 7*9fyyeps0-W resistor 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-mHx+0rh fbux 8d( -uyx)q inductor 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 reactnmpk8dt 9 k* -zz/veh3ance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil hcw8. l7g) k2vfmen, t**gbbzzave 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 4rs3k7a s.v y:1jb st; oi4bzureactance 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-mHc1by2e md4k fbrva p09a4)fi/ inductor when 120 V AC at a frequency of 20 kHz isk 1f9 c 2fb4aapvdb/r4eyi0m) applied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz sourcen c34b+z3x3 )h kgukvj?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 kH qi2vvfk-jc q ;-ndkg4,ovv99 z?

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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 capacie 3czcj/1 qit x58wd*ttive 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 reactj5h tb*ir9+djance 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 reactancee*hheiu x-8it ep2 ,g0 of a 0.010-mF capacitor be 100 Wux i-8gh*,e ehie t02p?

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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 capacitor at 1000 Hp-:h mp(1ob9;bpcco5gj.h l tz 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 indu-ntx:fbfm d dv+)b .t 9;/riqtqdb . -brtv+u9xfi/)n ;m fd:uctive reactance, 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 f7w gfl) 1z*j:*y:jxo(zlbem 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF)e: *jb gxwl f j71zz*y:(oflm capacitor 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 1500 Hz if a 100-W resist2qak mk kpn8gqig(u21tl z;h :v, ;ws6or, 20-mH coil, and 1.0-mF capaci1gm qk(qlkw v; ,2 s86ptganihz;k2:utor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is cont h qdxf0y;67kf0k. lonected in series with a 20-mH inductor, what is the impedax 0fdlko. 7;6hf0kytq nce at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20 fv;ra05tef w)-mH inductor, what is the phase angle at 10tv;r) feaw5 f000 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 neededa918qf:(osnbq22 tcb jj cb3z in a series circuit with a 20-mH coil and 1.0-mF capacitor for a jzbb22c qbt8jas9(q fc31:n ototal 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 df 0p+e,twh o/r,y-vgo4x fkr gb;; 1aseries with a 100-W resistor and 15-mH coil to get a total impedance o,1 pg-0y ;;dtgarbe fvx,h 4/kfoow+rf 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 500hy4-r2 evrg- /dbi 9f.ww6t )cl gg6dl0 Hz for a total impedance of 42.rh y bgt6ld9-l v6 w-g/egr)4cdwif 0000 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 ivay6* 0p)m**+tczio kp:shix 0n z*zrn series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kW?p*00**pxi* zz+ihs6nc r zv ma)tkoy:

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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 c. jihho, (nub6;v8 grlonnected in series with a 20-mF capacitor. What is the impedan. onvhurlg,hi6 (8j b;ce at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a t6gl c lk:h e;tct+78quriq 56rotal impedance ofh;8r q7ccei5+ ltq6 :grtulk 6 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed inuf7enjahnk/-q :234 fbl6s av series with a 10-mF capacitor at 1.0 kHz for a phase anq k-sb f:a/72f4nelvh 3u ajn6gle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kH7wlgje2ep* p5 z for a total impedance of *jpe 2w7peg5l 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. ;l k1j7vt*b8kng+odff6q 9on+0erqf What is the phase *rn + dbqfl9fg+;ovkk1 860j7eo t fqnangle?

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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 1:z hz+akq 8ya3)+vlon d3xb6s00-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in sed:+ ohl )zkanq+683y svb3zaxries?

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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 t*v43p7/x pzl; lhuiru+:qsy vpi09o capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power+oz0 ; h*4:ppvsxu up l39qv7tyri/ li 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 zam ( 09e/betvcapacitive reactance 30 W, and an inductor of inductive reactance 30t ea9vb /e0(mz W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series Ry htl alr47i. uyl;6+oLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supploa;l64r.lt yi yul7 +hy?

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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 srs s9k586dhj( k70/agybc u rresistor for a phase angle ofs9(rb a j/ky0g6 ss5hu7kr dc8 $40^{\circ}$ 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 Wvbd2 evuwb:c:22e z *,tio2eq, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving s qowu*b2zied ,:btc v2v2:e2 eource?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resia4 cx z))1qjlg28k1fyft lz+geo: 2iqstance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 12g2ye+) ofl18) lfqgqxi 1tkzzaj2 4:c 0-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 cir s/k -wc2n7nbjcuit 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 and a resistance of 30 W. What isqxr(4.y uel9g:h mt:k -hwnyjso ;e)( thee;4(wx mjo: u(yq.:s9 -el)rh gkthyn power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-ckr 3*33)9 prvx;fxvmmv/ lhkW resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz crr;v 9v3hkkx)33xfvplm */mpower 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 a 15-mH coil in8nne9id1v w8vwi : b6c series? invb8evd9:niw1 wc6 8

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a resonant freq2 v;ya6 p vtmul1olm)3uency of 10)l2o1uty l6 vv ;mp3ma 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 u3rcrfp)lq3q7ppr8 p j;*q z9resonant frequency of 1000 93jquz frqp7p*3cr) q ;pprl8Hz?

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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 reskgp z3;+n:lr(d-5,ch hhk* cmx)b phaistor and a 40-mH coil if the resonant frequency-m :pgnc( *lhkc,+d;h)paxb h3h5rkz of the circuit is to be 1000 Hz?

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