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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 magne(2 yanai0rz; ztic 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 tht ,xw6p;1 jdthe 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 coi a6yii/v7 d9e9xekfar)85 apol produces what kind of change on the inducexd)a 8iay pf6 ar/9vi95 ee7kod 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 oroj(o+ h4 zp7j5w td7cf the magnetic field through a loop of wire produces what kind of chapt4odh7 or7 (z5jwcj+nge 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 whai0 1bwv bdzdb+7y7xyg*ve5 /z t kind of change on the inducxv 1 zyvwyzbi +bg*70dbd/ e75ed 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 frouq5s dp(rjt(ev4j-1n j( d 2 (pnsr(eym 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 conductorcqr (bl5q/42eu s/e ca-acc (p will be that which tends to produce which of thq-l(aa5 4 esc(ub2ec/cc/ prqe 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 magnetsf-khy6 0f)q k eqppvh,):p*q is held above its center with its north pole pointing down. The stationary m ,h -psk*p6eph f0))ykfqqq:vagnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above its-mdva v*i+kq, center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewemvdk *+viq -,ad 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 fioko15 7eq hj*77q i ;c7nkccldeld vector points straight up. The magnetic field vanishes suddenly. When7nlqe ;5kcicj 177ood*7qhkc 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 magnetii9 vd-c9/g :bencj/nsj o+n(vc field vector points straight up. The magnetic field suddenly grows stronger. When viewed f/v j/iccob-ns99ndevjn +g( :rom 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 fie/jjsg /7i+ib6x6s nqp.peg q*by6 ;hlld points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in+6bi /xj/ gs67in j phqp*ygq;.b6els 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 horzz,-c8v mm-lx aad-cw(ov2k* izontal table and carries an ever-increasing current northward. Two coils of wire lie flat onlo aw amvz-c(xk dv, m-c-82z* 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 ac e)akks k-r-) loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed fro-eks ))kkra-c m 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 9eehuf3* u qgft:v64lat constant angular speed about an axis whose 93q6vu et g* hf:4fluedirection 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 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 about qvyps ; c2.a;zan axis whose direction can be varied. In a region where a .y a 2psv;q;czuniform 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.q-ezpxa zxf)pl, 46g3i rt/0u
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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 rqib3i emvbhr;a 6xtv65 g (7.ypwohat 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 aybp3q 0gpp5 m5ol448 aa +tmb3grxp4p 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 (oriented in the east-west direction)je8 q,.sfdp :t is moved northward at constant velocity through a magnetic field that points straight dow., :petfjd8q sn. 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 velocit rwyyezg:wl/ s4ng+ m j4axodr69/.5 jy ω 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 v -bs ct.1 a7 vsyyzguqp.+t8ca1z,+jtransforms

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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. Thw (av j3i:lh0he frequency of theh hj:wa lvi0(3 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 tld8sg gyw(43t -53cxjpkn ak/ j5nqm6o

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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 tjxptz 6vkz 3 *mje -w81gof49:0zjalp hat

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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 spn/ar6hnis0/ -se7aqz 8i-xz0.kvd k i m.(qprimary coiine7 /h/qk z. kd.(-p-vms sxiq6na irs00z 8al then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary6m- kd*rubrr- coil contains more loops than the secondary coil the -r*drk6-rbmun 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, theb*)k:f kwvwh7 power 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 resonantdm m1hn (36 nlcp1z1tz circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected-q b k,e6jrrppr4g)9u ,c 6jnk in series to an ideal battery of constant terminal voltage. bek pk, jup-, )q9grncr4rj 66At the 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 batter 7wusxaet; e 9cfix1 k17w5/dgy of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inducto;5 dweek /7 7ixfxu as19w1cgtr 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 resistancbn+ua 79goha.1tl n3: 1 xabjce 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 y1 foats w1k05)v; tvfand 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 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 pl zx(g68hvhzz0m-6q in series to a battery. The time constant 6-vz8zx0lp6zgh(q hmfor the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductorn(gily 7 slv;4 are connected in series to a battery. The battery is suddenly removed from the circuit. The l7y( vs4li;n gtime 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 hjc w p(;oh32kcf2s3znave the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. sj*e(lf.dd0rc0ou8 j-a 4 kgi On 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 connectexe zx j-0o ++t::lqckjd to an AC power supply. In this circuit, the current+o:z jk +lejxx:tqc0-

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the fr,jg k7i ek6,a+ru5 x52djat d0l y0dkxequencyekk,yl5kjr0daa6j20 ux x d,7+5t idg 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 acrossd,wls 1zcw; u+ an inductor is doubled, the inductive reactanl1s;d,zw + cwuce of 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 theugwli v1a*.bipgh*,-lps x,+ * )am) weh liu0 AC voltage across an inductor approaches zero, the inductive reactansi *hg bwamu,w)-,) le .l0p + lua1*xh*gvpiice 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 g6(o0 svrxd,ifp( gj3h /dx: tlb5s5eto an AC power supply. In this circuit, the current(t3b( 5pg5j/os def6dxrxs, ligv0: h

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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 * dl;z13jte9ey 9 slj j-ys4xncircuit changes by what factor when the frequesxt*szyd jee jn41y39j -l l;9ncy 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 approaches zeruo okjkxf-3*q nhu3:22gv : ogo, the capaciti2okgu :gq-n3k* :uo fxvh32ojve reactance 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 angleb+2 fln. bk/on-hzk1 b between the voltages of the inductor and capacitor in a RLC series circ/1 nk. n+zb- ob2kblfhuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defie jp6hzrj*s3 6ned 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 circ-d1zu:y ov k0auit increases if R increases. When is this s o:v1z0kda-uy tatement 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.yy87 w je+ eyvm,h51a-r3wtx6zbdq3o The impedance of the circuit increases if XL 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 circ4zey0gy ty 6d;v2yr 1muit increases if XC increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC seriesg :+x5*dgmbf i circuit, the resonant freq :fdg5* bgx+imuency 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 tm:4v.ifkyv: x hat is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occur-wlx( :mtt g;ks 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 4.0×10−5Wb 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 q +: s.o.tctvyp*f)khrotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop w)+tkycs.p o tf*h:q. vhen the plane of the loop 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 magnetic field ofrg9x59phk,2: zc6k(g1u izw utz3 g vy 0.20 y u9(2 hw,gvtigu 5:z96g1p c3xzkzk rT. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in*xnvj7b 9g7 ti,tq-ae a uniform magnetic field of 0.20 T. Find the magnet e7*n t-ivjgt79 ba,xqic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of 30∘.

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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 re me j4x xib6+15kna0hdmr-g8 hduced from 1.0m2 to 0.50m2 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 fromum 5l +s u78hbwz:emmrr( .. vzg3oa, n7xrns2 4.0×10−5Wb to 5.0×10−5Wb 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 d,5 gvwaeij6; 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 to 0 in 8.0 s, find the average value of the induced5;6 ew,jd vaig 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 wires*- lis 2sr ae4b, dczv*04mlo with 15 turns and an area of 0.40m2 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 . 3vy:9ogl.evsfftn9 area 0.20m2 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 me) q5cnxx t+,+qcm.1y1st gvg flies horizontally at a location where the downward component of the Earth's magnetic field) vm 1,egt5c.qtscqgyx +x1+n is 6.0×10−5T. 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 velociq2o,hjd-hq2 9 ,gwu zpty of 2.0 rad/s about a vdz o92p hujw-h2qq,g,ertical axis through one of its ends while in a constant magnetic field of 5.0×10−5T. 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(fo1g;a 5wzgfl 6 ;evt has 50 loops and a cross-sectional area of 0.25m2. What is the maximum emf generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of arb lz3ek6wqf4 :ea 0.090m2 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 i1o y:js 6;hmrbts armature. 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 magnmo:sr ;ybj1 h6etic 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 ofswlr r91.ww9fy e qm74lxy(t3m(qk ; w 100 turns of wire of area 0.090m2 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 an output o5oxq d4vfifb h6aybsv6 9/)j6f 12 V maximu/y 66is46 5 )b9xhqvva bfjodfm when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is 100cm2, 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 geqk 9kx5 v08tsr; r)t+hz igp(jnerator with a maximum emf of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of 0.030m2, 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 m/ai6bh wf*w g*otor have a resistance of 6.00 W. The motor operates on 120V 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 eugct1uu jxhtj152-om2 i2 7,ouuu,thave a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generateg2t o1uu2u mo7 t1jue -,hitu,cju x25s 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 to a 24a7k ,poa, n9bs-V power supply. The operating current is 1.0 A. What is the start-upob asap7,,nk 9 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 intern1kys *n jgot76al resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Whatsj 6ony7g1* kt 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 to9aee9 av*3a+8 7on d*sov gzqx a 24-V power supply. The operating current is 1.0 A at fullq+a8d o *xgve a7za3*9 eon9vs 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 israsdqi(); c.bkmp b, o.+e po- needed to reduce a primary voltage of 120V AC to 6.0V 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 vf mhf1hh)15sof a transformer causes 14 A to flow in the secondary.s5 h )fmhf11hv How 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 turbe c6o2k( *oeons are necessary in a 110-V primary if the 24-V secondary has 100 turns? *kooe(bo2c e6

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn ts h*)r3ogs;tbrc9bql.6 c n:secondary coil. If the current in the secondary is 3.0 A, sctr*gnhb; ctl9q6 r)3.os b: 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 thaq x*vp-fny,g(kfl,y* pn j5 q8d9r 0he primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondarh*( prx -y 5g98pff, j0q,k n*vdylnqay?

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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 at 10.0 mA. T7jvjyilx kv75z2c. fem4+ k -the primary coil operates on 120 V. What does the primary47jjfmk.7 2+v5yiev- cz kxtl 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 ha)ycd e8;hvq(dv,*n l us 60 turns on its primary coil and 300 turns on its secondary coil. If8 q(e*lyv cvhu) dnd,; 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 300 turns on s.o z feag.(1xits secondary coil. If 120 V ase(xaz g. o1f.t 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondar 7da;y,o 7f1 virj-qfty has 200 turns. If the input current at the primary is 100 A, we can -1d i7 fvfjyq7;ota,rexpect 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 transfor p- futo+c0dlovy;62q mer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the oq+po; y ftd2-0cl6ouvutput 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 turnskdfz ;j+ ap57sufr caca/ .i)2dl(.bz. If the power input to the primary is 100 W, we can expect the power outputf zf.ardi+ c) .5/p72ak(szalj; cdbu 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. The voltage is usually stepped uk fhh7h ,e-0hzp 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 primar7,hh zhhk0e f-y 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 usuadt2k 1sdph: j:lly stepped up to 4500 V by a transformer and transmittkd 2ptj:1sd: hed through a power line 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 60 A of current at 120 V. The voltage is usually stepped ;65py /(argmksvve a, 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 ifkvg;ev(r5 asp ,ay6/m the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance ofw 2(h0.a9vbs; f +hspk3pjeto 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio os.pbf290+;(p3s t jwehhaov kf 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 rezfc1 7f))l1u0 x hwehas 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 transformer with a turns rati1we 1u)zlfcx7rf)0 he o 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 lievqcdqb-fwd6 e az 0jo q7:-// xa0 cl0u1v)gfne at 1000 V. How much less power would be lost if the power wecvw 0cf-)b07/eafzq uv d0e:qqxg1-6 od/ aj lre transmitted 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 a1f.)i45 b89hwop,ioghp x vuyt 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss inwpi8o)ob9 1 4xi,5hvpgyu f.h 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 enekq+ 8kew9c jk :5rli,j24w urkrgy is stored in the coil'sk4 i5rwkw9 :2, +8cuqklerk jj magnetic 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 inductor. What is 83x,n i,)rg:,o n8 qxscit: hed izwk*this cxz:ns83:igq,o x ki)c dr th8ei,w ,*nircuit'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 volt6(. i7lge3bp arsoru5mm9/yfage in an AC circuit where 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 cuh429log uad9nrrent?

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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 plac4ul+0x 8 *q ,zylycpvxed into a 120-V AC outlet. What is the resistance of the lampq,+cul4z *x pyxvy8l0 ?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What*jabbum u2*4 n ;o8rch is the peak current through the reuhn obb**2 a;cju4rm 8sistor?

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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 k3gls)/kz9l mpower supply. What is the power dissipated in the res /z3kl k9g)slmistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is 2:ddy rws-a 5u+ uomfq:e8)xcI=0.80sin⁡(240t). 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 resistor is l3va.uk7x 8emq, ww 3+;nwedk I=0.80sin⁡(240t). 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 resisto+fbb6p94- or)ts7a 8gwbx ag thg5 wp1r is I=0.80sin⁡(240t). 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 / 6hm pi+mrr*sinductor 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 k 1xic2.xa7y*x ew5xi2.50-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 have 14.0v(/nw1er , msz 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 induct0s 1u lnd, ;uozaf7c1tive 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 i0l/acc r7y)ch/st *qn nductor when 120 V AC at a frequency of 20 kHz is app)a7nhlc tsr y*qc0c //lied 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 sourc8pgpu.j5 zs+ se?

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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 reactajd.shfsnn.,u h-ybe0 + d4z/jnce of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capaca)p7xbh nz32i itive 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 10il qx hv+ :j,hoay+2 b+kxcw46-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 : * ei/i u3rgprx7)t/gd3ncbocapacitive reactance of a 0.010-mF capacitor be 100 W 3u tob*c 7)/de:rg 3ng/prxii?

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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 Hz nkcv5l: f6 3xuand 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 fkc9m5.y, ypb ac series circuit with 12.0 W resistance, 15.0 W inductive reactany ,c9yb.pf m5kce, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, a0)rg g trq 0,jm7inus;nd 1.0-mF capacitor are conn0 stjmq ug,)i;rrgn70ected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF c+,xt z:v v v4ljj5tq/tapacito5jz:tvt/+ txj ,qvl4vr 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 connected in series with ,*b 6n8p+nao )2iy htzbneus1a 20-mH inductor, what is the impedance )6s2z+,nt8nbb 1py ahui *one 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 c70rrwd u3kw l2ep2ls 3onnected in series with a 20-mH inductor, what is the phase ar3 s2p0ule rd3w2lk7wngle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil anv dcgk(8 hqc(,d 1.0-mF capacitor for a total impedance of 100,cdcvg hk(q8( 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 followinzxpkgo ; gc(t2p7d1i 5g capacitances is needed in series with a 100-W resistor and 15-mH coil to get a (;xi5z2tppg1 7kdg co 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 acp8 ie((rvzpl e5krvc:6 h;8wt 5000 Hz for a total impedance8i;krevcpc68: z r(p lve 5h(w 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 wrwm6q z:*ttsux45h 1 zith a 100-kW resistor at 1.0-MHz for a total impedance oqwr xt*:zt4s6zmh1u 5f 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 xg: wc1p7wcl+a 20-mF capacitor. What is the impedaw 7w+lc1: xcgpnce 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 forii1(cg m-i,db;bi e /u a total(idi ,iugmi/b-; bce1 impedance of 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 capa-5 )rydhgs6i xcitor at 1.0 kHz for a phasesg )-irhx6yd5 angle of 40∘?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is nee q,9sn7 z 5jcjmfut+p0m0ad-hded in series with a 30-W resistor at 1.0 kHz for a total impedance of 45 W?sm+dtqa9u05-0z,p7 c h jjfnm

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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 seri9iuboxep4/ v:mi 4 kz/z,.uywes with a 100-mF capacitor at 120 Hz. What is the phase anglzo epmz ,4i/:/v4uu9kxw.iy b 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 resw*s(h.y rmjrm. m,edy 5 b/ah2istor, 20-mH coil, and 1.0-mF capay/. mbm5(h2r rsyjm.a,*whed citor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-gvwa.7d e ph8poro.z mh.t34 1mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60ah4w 3.tzp.7vomg per . h1o8d-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 cap6xyes-qv)z)jc1bjg/ a (e l9aacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-j9lz cs)jg1-6 abyx veae/ )(qHz 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 50hv-iiky) rq//l on2 91pe cu9f-W resistor, a 10-pe9 rhvklu/-n9of2q )/y1icimF capacitor, and a 0.45-H inductor, 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 ser4gc )m.b9 akm)aryo2 eies with a 500-W resistor for a phase angle of .o2ak4eyc b9m)a )rmg40∘ 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. bu.oy9 rh7dsa1gu s8 :wl/gn. At what frequency should the circuit be driven in order to have maximum power transferred from tggs:d ./ lbyar1wsunu9h o7. 8he 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 serqtx gf v9ibjg98)omtk2 8bz1iy4 e04g ies circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when tj9g vtefy ik944o b2bqgi m1gx8 8tz0)he 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 circuit2jrh 7e3)dv(3w8hycmojk0 a v is 63∘. 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 n.yj(z),fh8p. s pdqyof 30 W. What is tzp p)fdh j.s,(q .yn8yhe 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 RLq, gsdhmtec v7b8;+g9 C circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected t md;hggs8b79 c,ve+qto a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of )g(hvuh+ tw t-a 1.0-mF capacitor and a 15-mH coil in series?v(hw h-t u)g+t

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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 seg)4e 0t;1a4vzvi e gagl2yid/ries with a 4.7-mF capacitor for a resonant frequency of 1y4gea21it)/ leag;0 vgi4d v z0 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 bw :pj :kux/6presonant frequency of 1000 u6p:/jbwx:kp 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 mu8bm ,jktg+m cf-n(n(ast be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be + ta8mgk- bmncn((j, f1000 Hz?

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