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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 units of magnetic flu/3ijus7(zp(g0f c) /8wlkt; ii qtwn ix 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 stcdxqi(bxkp9 .) 1r3qyates that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops ou4 e4s3j6 s eam3.pleyf wire in a coil produces what kind of change on the i e34sp6em3uje s.al4y nduced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire pro h,9mj*/j1af s*hzsvx duces what kind of change on the induced 9zm1hxs/a*vjh*,s fj$emf$, 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 wurwxzk*jcu m,(u;6cqvh,*mz,yf 33 qire produces what kind of change on the induced yc ruh* mwxc(33; z6, k*qzuju,,vm fq$emf$, 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 fro/ i1skhak8g60 m z5as2ll oxb.m a magnetic 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 direction of an induced current in a conductordk,n v3h-byj5 will be tn-bhv3k,5dy j hat which tends to produce 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 h2 25 xsl7 awd8nd 7fo3cg9.2hajw yuibeld above its center with its north 2c.d2g8a 53ba2x d97shjw w un7filoypole 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 m(ghu-/ qdv( lk/ *zymbagnet is held above its center with its n-(mk/ub *zqdlg/ hyv( orth 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 b)chdaxv24xo3l (gcn3c1 -lj in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed jxl) 31 da-(glccx4vb 32cnhofrom 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 we 0h9uug/og1 a region where the magnetic field vector points straight up. The magnetic field suddenly g/o1 ug wge0h9urows 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 field;di0l vk*yqg v*cr knx-31a)q points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced *v;xkq1-q* dyl)igckrnv a3 0current 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 ev.ir6x 4tk bt0gzn4n)hu /z o)zer-increasing current northward. Two coils of wire lie flat on the table, onetz6i u0)zoxb.k 4 4zn/ghr) tn 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 th kope/e1mbk4 f 1(vwo9rough a loop of wire with the north pole entering first. As the north pole enters the wire, the inducbm(ef/ok 41k wp9voe 1ed 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 c pxibu5*8bby)q ug ++toa +k,zonstant angular speed about an axis whose direction can be varied*+uauxbqo pgk 8+ +y)tizb5,b. 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*nw*yoirg ,f 6 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 r 6n,gow**yfriotation 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.n .y2 pa2ekr4e
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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 tj07rfktwak4 :m )ph1mhat 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 fm*8bm t(;gzuc ield. 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 a (jpk f- praqb9 :f8s*:oc-:xxy 4nqxrt constant pr-( c:fj-n: *8ry q a4f9xpoksx:qxb velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular vi12pzn fl.6 ftelocity $\omega$ 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 tra,huv6hgkd)om/ (6 mhac(v -c tnsforms

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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 ru..m1 3d-,bkyzr 3 ljk)jjg wj ;qdk(oevolutions each second. The frequency of theq,joj)g. 133y( bm ru ;d-jj dkz.wlkk $emf$ 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 kh++ q2gdqcmb4l5j n)c89a psto

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device tn l2,,g 05za/-etyaah fbu1 shhat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the pr/ fkj1qcjg7j,tn2oy;2 3 dxvj imary coil then it is nvoj;jfd ct7j q3,212y/gjkx 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 contarp 9ta6znm2a;ins more loops than the secondary coil then n zta;ap 6rm92it 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 pbmcu0 qibm8af8 j;q66-pvqh1ower 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 cir+nr(7 x2ngfmk:dyw .ryuu;d)cuit,

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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 l676 o c- ygwnu )bd5nrd2l-vqto an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the ln6-y725o g-w c)nb 6ldr dqvuvoltage 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 inducto26ng k/ h*fgaptb9ji-0 aedy5 r are connected in series to an ideal battery of constant terminal voltage. At the moment contaa2*f pyn igat6j0ke9gh/db -5ct 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 y (d4qh.omi+aL and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is caz:3qy vfg8q ig /avqp/wh 6j/.w-5zconnected 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 i8am +a(dzwrzx. 5xts-thb27zn series to a battery. The time constant for the circuit represents the time requ8azxx(25wrhtmz 7t-+ ba.s dzired 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 batter/ .vx* wf5eqwfy. The battery is sud. 5eq*xw/wf vfdenly 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 unitsn ; vp8sfg gwk11 rfm.5mag(kcbx-+)u 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. Opp + 7immvs p8bsvm)uv 3q(luz..5be,n this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit,u/njd 6s9 pzn, the curren9 j pdn/un6,szt

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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 change-su a2ydq 9h;zri- so-s by what factor when the frequency is tripleus s rai2--zhqd;yo9-d?

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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 ac vkhjf4*u shf0 c+632djyyif:ross an inductor is doubled, the inductive reactance of that indufys4*j ffikc +6 :v3hdyu2jh0 ctor

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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 aps ;r j2kg fid*/1 os2nd8ffr3cross an inductor approaches zero, the inductive reactance of that coil1sodk dgn p2js3;/r8f2i*r ff

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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 i-; 4hej/ .(s roppdqjAC power supply. In this circuit, the curreeq/phoji(4-dp rjs. ;nt

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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 factxeld 68dj du16or when the frequedd81e 6u6d jxlncy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor ap 2(ig.wli +tmw-wvv;2+sfyr uhg97lt proaches zero, the capacitive reactance of that capaci v+wulgtwgf7ys2-2;r (ihivw. l+ 9m ttor

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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 of5re+t fp9nta9 mx5j x0 the inductor and capacitor in a RLC series j5tn r0 em+at 9xxp95fcircuit?

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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 anz6hxylbs-h 1rwg: zk+d 825zr RLC 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 impedance of the x th9r.j ) kzasvlc. ;p).p-utcircuit increases if R increases. Whenspclk9z.jtap.v;h -x)r. tu) 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,* syp8 sl:pgyokq++ t uh(gx; 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 impedances.v63gos vrl/f-pp f 3 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 capk4fd+ axxs+8ln: e os9acitance both double in an LRC series circuit, the resona n:ex 4solxf8 +9+kdsant frequency of 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 driven by -k s7uy7o :fyhan 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 RL:xfc4r) njqg .C circuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rot,f 3j kkllg4i9ating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop flgj34l 9 kik,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 radius9xykg l8)6u*6rakjfv 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the planv6 )rxul8k9a6ykg* jf e of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.3c x0i2dk86px j ogkt720 T. Find the magnetic flux through the loop wh8gjx67o ck3 2i k0dxpten the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is red0e6xlei. zb*.yf),bux19xqmp; sk.con/ th uuced 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 changes f-z,qu/xl jy qm3mh035m:dn z vrom $4.0 \times 10^{-5} \; Wb$ 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 18oft 2)l8d6j0 tnc0jyg cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformg6) t00jfljno cty8d2ly 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 l3. to0)y u4vsn ;tjaiarea 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 andm brex)yg7)a e4js+j2 area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location where thez6ok/kdf ;) 6xa yzzo; downward component of the Earth's magnetic ax);dzz6k 6/ofzko; yfield 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 angular te+-q h7p0pb3q jlo w;velocity of 2.0 rad/ 7j-tpe +qp3;w0obhqls about a vertical 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 50 loops g* t7rnqkxxl s,w 0/ 41l +aiokwjr /iixs4l*(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 109;iqwwvkz,cdy;5) t e0 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 armatuv7.dtkqmc7o wx 1k1da h/9tp.re. Each loop is 12 cm long a7t1 ddcq/xkw. phav .7o91 kmtnd 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the 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 o3mcf-josagbw: 50 brk ga*j 5;m-bh x,, p5kbxf 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 genelou,h b5w5 rhw1w4o)wrator with an output of 12 V maximum when rotated at 60 Hz. A magnetwwuob,w o4 hh55wr1l) ic 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 maxiulz u9gz.yq0vm g(r /.mum $emf$ 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. Thx1g2px0.edqc, bvs s(d i1ap(e 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 rv)hg :u:b)s9/ft ak yktk(hu2esistance of 6.00 W. The motor operates on 120 V : k uku/tah 9(tf:)bksvy2 hg)AC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 h xyc)kdn*+j+5vs.gz W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up current?xdjs+g nv*5hc+ ky)z .

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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 internalm+7a a9 se(4cwmiyci, resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 Ay 4m(ic9, aia 7cw+sme at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V powesjw7zfqx+wwuh97, ,0r g-(lv/e dt snr supply. The operating current is 1.0 A at full speed. What isq fngew-l0wx 7+v r 7(,usd/tjsw9zh , 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 re .nerui nf;kyf3,g( 2gduce 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-turn primary of a tran*zz2 3lgsyz50h5vb-. fot9 rdu l6saasformer causes 14 A to flow in the secondary. Ho69s b d0gy v5oaaftz-l u52hl 3.zrsz*w many 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 6rsk(kypqbb6 :fc*k- if the 24-V secopc-6y*(fkkksq : 6rbbndary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-f5ym 0i2k 3w ti qh;hnwa/lk2c.e97 vuturn primary coil and a 2000-turn secondary coil. If the current in the secondary i. nfy h5l wck9i2hm7k;w23t0e/ avuiqs 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 :t dl-pg0t ld6primary of a transformer. Assuming 100% efficiency, how many amps at 24 V -6 ptdtd0l gl:can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V atwngm 7 i.l:8q gt5*fva 10.0 mA. The primary coil operates on 120 V. Whal.ant:q7 i58wgv m*gft 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 itt*5x k) m2/kpv2wtpqn s primary coil and 300 turns on its secondary coil. If 120 Vkmpq2n vp* /5wtx)tk 2 at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on w mb9c-f2g bn3-d*cv)/0kw uskdk *hh(r g1xkits secondary coil. If 120 V at 2.0 A is applied to the primary, what cuwg3ux--2vdkfkghckhb0/ sk*)9 dwm 1 r(bn *crrent 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 tg)j c;0aevs x3l rtz69urns and its secondary has 200 turns. If )glc x3 sta ej6rv0;z9the input current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondarw;zq-a k)snk- il*0:ure;a2/v zwrv)rfw 0tby has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltwswk0-/e; lq v az r-i fnak)0:)b2t*rvu ;zrwage 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 second-vz atmufa4;cv9eir4 *0p 6xfary has 200 turns. If t46-t*rx ;a 90fuza4fepcvi m vhe 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 at 120 V.yd)+27ny:wio ro+or x The voltage is usually stepped up to 4500 V by a transformr w++ xo72oniyr :yd)oer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. Then r+4plol9 gk1 voltage is usually stepped up to 4500 V by a transformer and transmitted through a power lg lop9rn14k+l ine of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 6-nu)l0 2a ; bbx ,mdohvgxep240 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 percentage power lost in the transmission line if the voltage is not ste ,nhx4a)mop leb2x-02 ugb d;vpped 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 bxco*l/(.tgjW. 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 wl ./xjb o*(tcgith 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 hacu wk.fuw :* vn:ybnp;11aki27a;sak s a total resistance of 0.60 W. A generator produces 100 V 71 f nu:a1y2k.vu*kcw;;sa pkwa i:bnat 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original 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 powerp jdbk:qs or78g54:c d would be lost if the power were transmitted at 30478o: brjqscd: 5dkpg00 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 transmitt9:r5 dx,tiu xfi +fz6ked on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a tra6xd,r zx 9t+ku:f f5iinsformer 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 is stored p-,5 izhn)x iop6 8dvpnzc/, 9z-mxmc in the coil's magneti md z-9hx, v8zpi5 -oncn,mcp/)iz6xp c 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-f93g(4 tx.m8 df; nlxuj opci+H inductor. What is this circuit's time constanpdf.x mf+x;4tuo3ji(8 9l ncgt?

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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 wf(2 u ejy/1.gqojd4gz here the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak :j dri y)q/(m) tnzsn: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 outl s)/tdiu h44 sttp:7vt;xjn.q et. What is the resistance of the lamp7 pt:/t s4) uts4xhvdt;j.iqn ?

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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. kael+l(c ol* -What is the peak current through the resistoeok(ac-lll * +r?

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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 power diss 9zc,8x;fpyd1 zz5n+6l rhor gipated in tyhgx 6+n581 l r,dcrz zpozf9;he 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-g8.p7vi13qkew78z .6+i mnyuj ckpa hW 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 rt 9fm4d3;jva: cc2a.jx oj- dfesistor 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 56m8lnvzq1y2 h0-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-mH inductor u)kg o5e/7zo wat 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 coilapo9w dq;5w q/n1qky /p4fzp : 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 evkiqdkt8j0ch.b 13i0z01 y n 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.s v, xdt2+jk0webzm0h++ exe of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 div3 no8yvpp3 ac73 3xkHz is applied to iti o8 3xvp 7y33capdvn3?

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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 thrk0cdnb ,;pab zg(5 ,ufough 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 of a 4.7-mF capcpav6 buk8o 217q7-eywhd,p8 br /cvvacitor 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 1t)kp7r.r3ijiea ba9tn::7 w m0 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 caparrpni+ bnl gzc/ 1e3mbs9-.o/ citor 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 capacitive reactance of a 0. /qzx o,bu)3kmea:1sf)t z+hcxj4oq6010-mF capacitor be 100 Wz )m1s q ucz)ob j:x+e3hqa6xt /ko4f,?

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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 1000ok o5-w2 crj)z 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 resistaoww)m0o u, b zy6o6x ic-0:oohnce, 15.0 W inductive reactance, and 10.0xy)oo0bhio-6 uwzomo6, : wc0 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 impyw +hlhcbrz *xoa(152edance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are cbh(z *x l ary521+chowonnected 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 anglezxgai;zt 38ri;nhn,i 0z;r-p q j61ou at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connr;ht;zx -z3, ii6i8g u0 pnjonz1qr; aected 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-rtuh6boxos v shc) -1zv2f7)9mH inductor, what is the impedance at 1000 Hztc9svxh-u2f7)1r b6) soh voz?

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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 indukc mgh 1;l)48bkl0w afctor, what is the phase anlgkh0k;w4b)fl 1 m8acgle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series4 ldc ca 4s.2ddznp/+nz jo)mzvhpf/vn /q98 3 circuit with a 20-mH coil and 1.0-mF capacitor fod 2p /co4l3m8/q.nz) adzd+nh4cv 9pvs nf/jzr a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in w+ 3 (-wluyszskkqmin h52cm) ft;v:0series with a 100-W resistor and 15-mH coil toc:lf-s 3 2(ms kui;vkw+wyq)nm5t0 z h get a 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 put in series with a 450-mH inductor at 5000 Hzyt(xu *pwxck2vg1l ;6nl+y8 w for a total impedance of t2+*cwul86kw lxy;( nv 1yg px40000 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 a pje 1k ly0x(v .+qadj4total imk0ldv4xq1 .+yepa j(jpedance 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 l*;emc;sua/ gh/ra6h . What is the impedance at 10006rlh*uh / ;agsma ;ce/ 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 kfz,2 1 nk bocd0qv7+d :n4smuvrs*b.nHz for a total impedance of 40+vndrnsd.1bnkz2 b q,v*u:mcf7o s 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kH,dw9p 26eis r;knq8d +kplqr 5z for a phase angle os2p dk6+w8ed,; nrr 5ikq9p lqf $40^{\circ}$?

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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 wit k3-3pk,g ,nshjiju.t+nwcx* h a 30-W resistor at 1.0 kHz for a total impeda3k+itsxgkc-jh nnu w.*, ,jp3 nce 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 in sevfx:xh:s h,q7(7 -pi ) 9fobt ae(bjnvries with a 100-mF capacitor at 120 Hz. What is the phase anglexv9ij snf7, t ov:(7 a(bxhfqphb)e-:?

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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 resis/63nf uckszoc2j z0*a tor, 20-mH coil, and 1.0-mF capacitor are connf*6jz oc/2na 3zk0ucsected 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,oaou+m 16m ni+ a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected tai+6o+u1mm ono a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, )ao7-js)xh+ llolm5kand an inductor of i 5k+j7-)la mx ollos)hnductive reactance 30 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 RLC circuit containing a 50-W resibc;7 r:n af, utofn 17i))ismgstor, a 10-mF capacitor, and a 0.45-H indubr ) n :i)t nfufgimas;,1c7o7ctor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a z.75p g pm1) zmgy 2*n;mya,biwvf4ayphase angle ofygv* np giwym41pa5fy,bm)7 z;2m. az $40^{\circ}$ 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 = 10.0 mF. At whatmw9gr2l/l k kfv*q2 msmc+d5 , frequency should the circuit be driven in order to have maximum p lsfqk,vlm5/gkm92rmc d* +2wower 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 insvprdx4 *k7 :f an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connecte*:sr 4pvk7dxf d 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 an3wq:q8/ 0nn bmtf4fvu AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30)jnwy 2s*nvxearr 4 j b:t32k8 W. What is tbsr* kx2 j ny)t4ev:8n jar23whe 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 kowagd oy *:;.for 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 power swky.o*;o:da g upply?

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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 in series3gp8;qs(( efwb ysc:y ?y(e wqfc:8s g; s3pby(

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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 resonantd3rs qa d2a.o)(n vlo0 frequency of ao()nd a vs0o3 dqr2l.10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant frequ7wq 9t1t6 6vf4kd nf lq+xff:p,p7icuvdb:0 xency of 1000 H1 :ipw7cvqdbu,9:6fxf7tkdv+4np6 xt 0f lf qz?

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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 resistorf7tel z/9l:zi5n ,u ua and a 40-mH coil if the resonant frequency of uz95a7 e iuz fnt:ll/,the circuit is to be 1000 Hz?

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