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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 91 kt7pqlu:h l;8u t/oq/z tbgunits 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 induction20mhtj4c-tu u states 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 of wire in a coil promo bheb p);20educes what kind of change on thp;0)be2bhm oee induced $emf$, 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 1bwwq6 b+t) k)k/hy 33rl84acw2 sq-zpsnsxoduces what kind of c63hpn+sltxs2qwwa yw1c3)k)os z4-8 bb/kr qhange 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 o* mf3(7bmu9qgwk 1xjw 3r/r cjf a loop of wire produces what kind of change on the inducecrj3j9/q fu mr(3x7* m1gwbw kd $emf$, 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 froi75h-b; cfu 2tzx+gpmm 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 directioq a/ nuyv6f s3zig-j6)n of an induced current in a conductor will be that which tends to produce which of the following yq /3j6) siu6n-fgaz veffects?

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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 horizontalhh 515pplbvjr *o( 6ci table. A bar magnet is held above its center with its north pole pointing down. The stationary hrj pli6p5bcv *o1h5(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 tap ow,kf w3,w7gble. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, tww ,p,o7gkfw3 he falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic 8q c k)+67jausuhlpg1field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the indua86uc j7lg+ u)sqhpk1 ced 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 magnetic field ve6v)p j2*(tsxqigzql j ;8o* lxctor points straight up. The magnetic field qizpgj82t)l ls(;6jv*xx *qo suddenly grows 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 horizoham2do4c; 0wclwe,.jxd ,/ig ntal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly.dlgwxh ado /i. m2ce0;4,jwc, When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on.jwteksj:59 u a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from abu 95jj.se:tkwove, 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 tj 6 m+mcla7v:pole entering first. As the nortv6j+ m7lma: tch pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular sp 9ji7pz+9l0:b wyut zpeed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what mus 7i:z9b0yz uptjw l+9pt 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 anzp,ic ftf.dt66n / -sngular speed about an axis whose direction can be varied. In a region where a un- cnp f,6i 6fzttnsd./iform 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.54s(vt :rwze cz2ly 3we*na*b
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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 an 7c u6h8g0fqpw))7no7ul qiya $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. The2gr +yeze8o; xsv73qujkk3)h-npj p7 $emf$ 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 (orieqa.0 onrf *ja;nted in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rodorj.*an;qf 0a.

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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 afwhd,e.:e. cze u4d-xt a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator 7px8gc2s5l2wz m0v4sc a kz8wtransforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequency oo8o7r b vh.sf lu5rj3;f the.h;ob f 38jr ulrso57v $emf$ 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 devu)igu1 xxa*/ sice 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 device tha7*g5ukrek:h *jl fvr*t

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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 second6 )ioc:ryh0(s. ,5anuky lfh eary coil contains more loops than the primary coil then it is5kfh,y:n .yscoaerh0(l)i 6 u a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secondary coaf p9b e/.+t z,xzokc.il then it.pabozzfe /xt+ kc.,9 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, thefd dgj7n-0 uaq q61;kg 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 resonant cir pbc ) jo5:tjaoe4 g3svv:b75xcuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to k4 -rtg1m) wxn+hr,dq an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the w,- xd+q rh1ngtmk4r )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 d j3yyuh*.9bo g2q 8tkan ideal battery of constant terminal voltage. At the moment contact is made with the battery, the vou* . 3t8kdjqby2 9ygohltage 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 resamg( xj92vffxev910n.eb 2pmistance 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 connected to an0w7ydyjb ipet5j 3:2x $emf$. 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 t w) o8rgwp8(e5w 7saa3k/ubnho a battery. The time constant for the circuit represents the time required for the current to reuaswbrge8o/ k)ww3a 5 7hpn(8ach

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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 f .q7w6z/ fblgin series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit representsff.6w 7blz/ qg 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 unkrf(d1b6tl 0w5*wxca its 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(6d2y 8* y6rc dtmo2wj opbie nc-:o(d to an AC power supply. 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 connected to an AC power supply. In this circuit, the currekzwf s+uw /3081az 2cpm muoo2nfwkmu8osaz+3c1 o p2m/wu 0z 2t

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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 freque u)di) 9rc(ejel2 i.aqncy ciedrl 2j9qeiu .)a)( 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 across an inductor is doubled, tffj j387bkp cl 7xsgc9 vt)4-agx/6gl he inductive reactanf)k9xt pc6sb4flvg/7ja3g8c7-gl jxce 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 the AC voltage across an inx ,,b qxxk.r(wso*)dd ductor approaches zero, the inductive reactance of that co(*xdo w,xsdxb .krq,) il

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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 AC power supply. In this circuit, gh5+cziw0 ual(,e /ngthe currenthzwicg0 g n /+lue5,a(

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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 kgf0w h(3.gmk.7 qdvfassvuh/,5sybs . :uh 1changes by what factor when the frequency iswhh/u,..myvqk 1(k vud0.g3hf75sfass s g:b 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, the cap3amd8n:(k x*ctxtbh* c -t9ofacitive reactance of hk axdocx*(:t 9t8*-n3fm tcbthat capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inducto k o4g8lh1 :mrwal:+m3rl -btrr and capacitor in a RLC series calm3+o mrr- wl4:18 k :brlgthircuit?

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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 circusivv km3xju0m d q ,:2g8z+fwno,x*9qit 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 cd)djw3bz zn.o;0a4qe ircuit increases if R increases. When is this statement true?od.jzbe ) d3 ;4awnq0z

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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. xel6ycpf( 0eltbv8 j0df -7g 6The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circubx 0d 13(nugzdpas7-ki 4fkh-it increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit/e4kkio lue1k6zh g2a:h m 4dvh*--s a, the rvgeihosz 2ahl1 hkmakek/:--44 *d u6 esonant 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 an AC applied volta). rqr zo mztbi*+n8mif1j v9feh)*x, ge. 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):q0t1-lsm 2sdkn cl(f9v csu when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic 0byi k-a 5k v/epz*wa1field of 0.20 T. Find the wa*0k 1 y-ki/ bvaepz5magnetic flux through the loop when 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 magnet.s.tr (b7 rrh1ucrgc3ic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and t(ctr.ugr3 1shc 7rrb.he 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 l:nebp,xof -3f6ek;u o7e 3uoin 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 are at an angle ox3 f6efu-pb:3ne;ul ok 7eo,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 arebmu3xv el2 zw95 f/vu7a of an 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 chang8iil: ql2zk9h es from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 2ec2mv) ;jffk 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 i2v;ckef)fm2 jn 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 area of uaee264 f/cjoi3.pmr$0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and q1sm)rmito.kj + ixjhp6n3 ot z7w26-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 locati3utsg*:+hm 0/wcc+ite7w q nd on where the downward component of the Earth's magnetic t7iun:* +hwctmw3cgd e+ s0q /field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.ux-**cut xt*u 0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis througuu uc **x-txt*h 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 and a crglb5jd1d,h /o 8:o10 j+pbiclkx.,r )mnjam x oss-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 100 turns ofa,:of y+u od1,y3 tsaf7lqahe*.d0g u wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 12 cm luq zwd*6qjp .,ghb bwb1vog -t23qx79 l 0q(ajong and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generatpouj 2l ,hxv 0 g zgq1dj-7q6bq9 wbb3tqw*(a.or?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of m4qger3.+ks n kb9qb+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 simple4 s5 )qmyu ocgs,6uf;w AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050;5 m)cg osw4ufqsu,y6 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 wit()i a9hisw/my5;a lx xh a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 1m2 ;ks xbdck.tjkbnms7kc (c:+vqc k 47vj)4 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resilnahg jm/+jw2*w9 rb; stance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a ba wrab2+ ;g/wjn9mj*lhck $emf$ 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 conjugxrge 30gry a7 .(m2nected to a 24-V power supply. The operatigr2 jxg(e.3y 7um0ragng current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. Tnxpj5y )-: n es d0om nhsx0.uo+36arbhe operating current is 1.0 A at full sor3m0as+o.jn exyub:h 5dnx6-p n s)0peed. 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 a0: gwt3vo1ay ba,*f+tllt 4xa 24-V power supply. The operating current is 1.0 A 1: y4vtlb3ot,w gfla +0xt a*aat 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 g u lbse 2*:qkn op*m0p(5m8csto reduce 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 transformer c4ko;nhg+ jh76 phhjq2r vqo *:auses 14 A to flow in the secondary. How many turns are in k27vgpj+o hhh : j4r;q*ohq6nthe 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 necessarytn7ks;mxac xnb0x5. yg )ml4.f*u e 5d in a 110-V primary if the 24-V secondary has 100 turns? .feg5kxysau; tn 7.clm0b 5mx4)*nxd

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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 , kzbzmgek,:l rv3t- y v5xb452000-turn secondary coil. If the current in the secondary is 3.0 A, what is the curreng 5vlvrb:ykm,,3texz5 -z4 bk t 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 transformehv hok;k) h/*ou/akp,r. Assuming 100% efficiency, how many amps at 24 V can flow in the s*hhpa) /;/kko ovuhk, econdary?

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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 transfou35b/9wenyh o o b(;xprmer provides 7500 V at 10.0 mA. The prim5wp(xooy;u/ b hb9 e3nary coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on i02 /cqwx7wa+sm+vc*u vll du7ts secondary coil. If 120 V at 2.0 A is appsa+ uwqd *xw20+7vc v /cmul7llied 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 turnkz8(mj tt *-xbs on its primary coil and 300 turns on its secondary coil. jtx bm8*-z( tkIf 120 V at 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 tur ktbn kuo, 5/u4txj7,cns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondary to be k tn,t7 oju5b,u/x4ck

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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 hase5sqb -yk. tn6t hs9,ei) sq:r 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, s,n-9yq trse.h ib:qtk)6se5we 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.d e9ce08iipv turns. If the power inputc98v pdie i0e. 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 curr5:kk2 pm n)v0r djvgd9ent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns 5:g dn0vd)vr 9kk2jm pin 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. Thei -agkz5r6, agc*)uo: mkhj, u voltage is usually stepped up to 4500 V by a transformer and transmitted tcukg:orh)j-zaik56um*a,, g hrough 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 pb o/p cj6)g1kof 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 lostogpcpk6jb/1 ) in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 Wk4xt +)3 xlmfkx 1d*h e8g/phl. A generator produces 100 V at 70 Ahf4xg1 8xep3h*dt+lm/ klk )x. 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 would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A gen,8hfhkusr6buj47- d-2f m iu qerator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage o6h8isjfuufh,qd7u24 m- r b-kf 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 a6b6*uthn w9rw 6-W line at 1000 V. How much less power would be lost if the power were tu6w*tnb9 6rwh ransmitted 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 /sg /1 yoj(zwt)d*df iis 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage *dwzdofs /yi(gtj1 ) /must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much enezm v:z+s* od9mrgy is stored in the coil's magnetic fieldo:+d*szzmmv 9?

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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 +k4:h l)vuud 3; ikurqdm,n3wz x7 (vrinductor. What is this circuit's time const(;lux :u7+rhkqzkvdu3i dn3)w 4m,vr ant?

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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 voltage is *tt/ 8f3wvyxa:j+f xo120 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 placchth9j x *zvyo,m0ho o37,k:m ed into a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is xkwn1u;o (ud t;t dfg*( *j,t/+cpeyithe resistance of the lamp1 ;i(pekfcdny ugw;** + ,(ujdxot/t t?

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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 1 6egw+996,jwl ( sya9ndmdb/h geqse 220-V ac power supply. What is the peak currentegd6h wdb9/9gsyas(, n lq9 e6w2e+j m through the resistor?

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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 powkv n c3 wjkn9 mnpdi0va* 9)me5,05c dg3j/xfper supply. What is the power dissipated in the re nve90gc/0d9ck)m35ijwkpnvn3 mxa fp5*d, jsistor?

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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 re .34zmu a.imdtg.fbmkr6pk(x4 gt:h* sistor 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 501mybua)a, ,wfc * f4 h:0n,r;twldwn x-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W rest 52(edm +b8gp3eabozistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60 Hz? (zgxz ak,0v. j,ityv4

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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 ngmm/u1 /rl-kh 6nw c;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 (eo45 hv ajw-shave 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 in -9 .fud-18zdoqi .cucwd;v ibductive 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 2udvjvsvj bu)ilc dmj45/ 0: inf001y20 kHz is appliei40)2juc0dy/ :bfv ldivjs51 0nuvm j d 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 througxqz4h bs)a1ay:+ s pm8h 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 c:.fmr y,dl kv0apacitor 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 req3 leal2 0mkc:actance 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 doxy2ai61.c6 f2 srhgqdes a 10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.0x,o*ts )4e1twn6 b svq10-mF capacitor be 100 W?e 6bwst)tn*,v x4qos1

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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 i++vhs a9f,q a*,f. yi,m).zn hvsrax capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15f:j4q lgy.w1b .0 W inductig 1:wqj .4ylbfve 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 1500 Hz if a 100-W resisto cfm r4i:c06e xn5s/pur, 20-mH coil, and 1.0-mF/ u nx6:pis5c4c0refm 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 resistor, 20-mH coil, and 1.0-mF qo(bp3p0y6+gqw:wvu capacitor are b :gw06quo(p3yqwv +pconnected 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-mHs n0 )7kgodr s.8-cb(tmin c3e inductor, what is the impedance atgb073).ssn drke(cmoc in-8t 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 co/hsh2ab o6nocl1dexd4,vtla u613:n nnected in series with a 20-mH inductor, what is the phase angb/os:62n,xa d acl n6 h4toh1vl1du3e le 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 crh: fbmb0rm r9k -1v+uoil and 1.0-mF capacitor for rv0+mm 1rrfhub- 9 b:ka 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 capacitan 8 r2shd8zq icdo;g .cf)rx.d;ces is needed in series with a 100-W resistor and 15-mH coil to get a total i z2;d8 f.s; cxd.iq8ohrd)r cgmpedance 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 seri2r r zfgpf hl6:(r.9h8ha b/dues with a 450-mH inductor at 5000 Hz for a total impedance of 40g9bd l h(r2 ur:zfhp6ha8/f.r 000 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 for1i l ue+z69kpm a total impedanczi +9e1ku6m ple of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is the im,ctpun4vmw (5t-dai 9pedawapv- tuinm,4c(t 9 d5nce 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 kHly60(: te iav wesd3(sz for a total imp (a(yv6tslei3:0es w dedance 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 sw2vxb8 +kh8v +xqz bhke/9b:teries with a 10-mF capacitor at 1.0 kHz for a phas+9k bhx8:t b82ebzvk/q +vwhxe angle 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 1w/cj25 lw+ sx st/ffg3.0 kHz for a total impexfl+s/gj5c/2f w3 s wtdance 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 series with a 100-mF capacitor at 120 Hz. What i*.sru)m tjqw2 s the phase ar. 2umjwts*) qngle?

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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 resi3q)wr73 aegqxstor, 20-mH coil, and 1.0-mF capacitor are connected in seriesw g3x)qa3q r7e?

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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 cap, .nj zf5rnzl;acitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is t;5.nj ,f zrlznhe 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 reactanp-ajzo,b)gjem xkvkd (uoe -m; i+1/,tg. n g5ce 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current eu5g-mv,e) -tnj1,x ida pogob.+g(/ z; kj kmflows 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 containin*dm 1jd7 z.qdcg a 50-W resistor, a 10*7 jdqdd1 mz.c-mF 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 series with a 500-W resistor fork;fe+bn i6: bxnd-jh+ +oex1k a phase angle okbef xin6+;x d++ bk :nej1-hof $40^{\circ}$ 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 what frequencyj -raieoz k- i,84 igqx3rx;i8 should the circuit be driven in order to have maximum power transferred from the driving source?eax8i8jgozxqki;4r3 -, i-ri

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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 outsclg3s-*08c /dxibmu v 97kcrput in an ac series circuit with 12.0 W resistance, 15.0 W inductive reairc/ u 0*mscgsbx-l98 dkv3 7cctance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC/9e+oh ndif g0 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 tay.-kcvb, 2:rx;w ffz 3((hjfh8 v icresistance of 30 W. What is the pow(v,8 zwcfhr: ;yt( iajb3-vfk c2f.xh er 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-W resi g1ic p2: 6l8anbwl)m/)fhfcp stor, a 10-mF capacitor, and a 0.45-6l1agm)/ wch) fb c:8plifpn2H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH c n-qyzx0fu2a( oil in series?znq y u0x2(af-

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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 resona,2xs, bxn2 .6hc85posxbsprnfu:h m 5nt frequencr m: ,bnf.5bxpohcph sns s5,x26x82uy of 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 reson/e72k /9fg*gc /umqtixs,v ywant frequency of 1/timefk qvs 7*29g yxgw/,c/ u000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a rp2(:gxfbwtu+. ,ngx 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 1000 Hz? n,:txf(xw+ g 2pr.ugb

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