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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 ahskbw:erq +d13 z.:qjre units 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 indub2c ,(e-mu m r4igoa-yction 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 coilitmyj9 fn**q26. dsnl produces what kind of change on the inducedmi.9ty n n*26jfqsld* $emf$, 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 throughxbiu2 dm1md0)cb 47 :b:r- ddjbw17 aevcpv-h a loop of wire produces what kind of change on th v ev:7cd1bd acmbrx d bp)24-1 mw-h:jb0du7ie 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 ofate7pls/r:05fvw/j r a loop of wire produces what kind of change on the induls/0 a7vrtf5ewp /jr: ced $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a /f y;nn2h 4mrpu0d*p fmagnetic 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 cg v hyt6ta0of+ j,.ba;3gy4 nzonductor will be that which tends to produce which ofan6t+hy3 f,4 zotajg;.0bgv y 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 liesguxr k(+t39rqh,gfolyf2 ,t - flat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed from abhf( rk t+2,3y urqfgo-l9xgt,ove)

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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 its1cmla.70 pgq fh0 ez4s center with its north pole pointing down, and released. As it approaches the coil, the falzqe01al.gmhfs 0 p7 4cling 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 regxzmkg7x5hjspb i-2 +u: m:pu0 ion where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from abovei 7u g ph0b:2jsmxm+uxz: k5p-, 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 wherekx +ywtt n-q6fi9,necxr)l x d qcok6- np670/ the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field ipix,6 tnl+ko r76xt-q6nyn/dk)ecx-fcw 90q ncreases?

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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 houyjtx)ugpf lmp84h 97,c*e -nrizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is tgu9p)mx7-*ley, pc t hj4 fn8uhe direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal t-vqg4ya 0 zna2v. o;pmpuj)u ;able and carries an ever-increasing current northward. Two coils of wire vmp opy qu.n0g;2au)z;-4a jv lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole entering first.sx hgsuo ),2eh,:v 6b kc7dr4z As the north pole enters the wire, the induced current rhsb2,ghexv 6zd:s u kc7o,4) 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 05dy2az5d xx y u54lqlrotated at constant angular speed about an axis whose direction can be varied. In a regylq5 5ld0u 54x dyxaz2ion 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 rota anf4;24ns pxfted at 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 orientaps;ffa x42nn4 tion 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. 7gk5g or45vvzn9mqk9
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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/r *euszm6jr7qgs(0lhat 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 field. 6.f ; lnzguqf+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-wz-wz95 azq*fi hw6 mc4est direction) is moved northward at constant velocity through a magnetic field that points str4-fhcz*wwza 9i6 5mzqaight 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 )yzk1nx70*pm2re40 o a pozou 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 tr1cns 637n+m tl0os l shh)og8tansforms

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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 sue fi,8akr1 g)lr 0 hp9wco*ur57fr .oecond. The frequency of tu7rfgp rol.a k ru)08rw9c1fehi*,o 5he $emf$ 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 dev;lvl (d*fgjk)y 0v cy1ice 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 deviceqy+gbp.tp4 b3 that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contaixww0o0b )0a7r w*g anyns more loops than the primary coil then it is a00bg7 nxrwawow)0* ay

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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 contaizgqdk,ju (,jg x dsbf/;, d,b8ns more loops than the secondary coil then it 8/,qx fdgjs b( kg b,zud,;j,dis a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power.hdccd o d+zi99n-t9p 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 circuit, ip//jk,modmw-h4r- c

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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 as-kyymo1/qd . re connected in series to an ideal battery of constant terminal voltage. At the mome/ykm y1 -q.sodnt 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 yec )iyr1 k(:x1xa zd4an ideal battery of constant terminal voltage. At the momentck x )i4d(1ay:yzex1r contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistancefrt d/.5)x0 uune;s53xmtlw n 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 ag(*bwud *5 iben $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The ti;5e 6j,zrddwhme constant for d rje,5d6wzh; 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 inducx w 2 bhl;l9.w;j/tkzetor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time rl;w2whkeb jlt.;z/9x equired for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units rch01 4hm gvokw -x)7wexcept:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circu x-19yvz 6rlr :mrbpr,it, 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 powizg()( r1vxg xs).rolv:n ox0er supply. In this circuit, the currento) xn gzrr1i(xo(g. )vv:xs0l

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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 chan (:ab-x :ovp*/pvvvws3j 5 zdis 7lo8cges by what factor when the frequency is trzp5*os(/ va:svv jcid3pbvx8:ow 7- lipled?

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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 m8n-5;)ut4 bl tkrqev, the inductive reactan-;4uq8t lv )k5e mbtrnce 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 voldg zfi0m21c*qu jj wdhw5(82c tage across an inductor approaches zero, the inducuw8 1jc*gzjq2dfd mwic( 502htive reactance 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 conlmeu9qi f,r46 x9 p3uleu8e8snected to an AC power supply. In this circuit, the currenti 889qe3xr supme, u9f e4llu6

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when the frequel e8/o2wjdu+t ncy isu ew o/2ltj+d8 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 / k odejlj:1sx9r )a+8wbwj0.pcz/ 3fsrmf-k approaches zero, the capacitive r/ jzjpr3.8 ab0wsorw kfm:d/ c-+9 jfsex )kl1eactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of 1iesjx53q 2s-v tkdp5 the inductor and capacitor in a iq xk5s2t ep 1jsd5-3vRLC series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC/1a7 oesz1h:v 1ys rnn 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 circuit increases if R incrgwaqc dc p+*,.eases. When is this statementc adp.c* ,qwg+ true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circui k0ggs g+q,ma b h+: 4c9vmo.;sitet5pt 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 cd xp3/hudkrs0*7q2 ucircuit 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 cii):qk;dr+ 32ln0jb sm7 q: kwb0pcr+l vug/zqrcuit, the resonant freqkkq u2)7 zicprj 0 3q+ 0nwmrs; dl+:/:gvbbqluency 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 islxz)ju2 f; 8oc 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 ocuy,yk)iy 4o7a(d+ hk ;lhq 4ddpia/2ecurs 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 fieldvrg6 6wahr) /o of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and th og)hw ra6r/6ve 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-5d, bua) cc5p , -8srndizp4vge8 ukk)nkd.f a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetacbfreik )-dd5s.k ck8 )udp8zpunn -4 ,5,gv ic 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 roto+pr6k6n.t q iating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an 66tipo. q+ rnkangle 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 lo/i 0uhcs* xs,sop 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 changes fa ,z((cq-g 6za9eq l0qv 2lglsrom $4.0 \times 10^{-5} \; Wb$ 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 ;ko 6-dul3o sv ot74qd18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If thetos; o 4q63d7lu okv-d field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area ofi *qa8o9,ezx bt9tgs( $0.40 \; m^{2}$ 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 3ozv h)lldi 6z(m0l g,and 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 fliesao5vg wp exxu8f0.ml9+(zf9b horizontally at a location where the downward component of the b.+ xu8x95 vmge0plwaoz9 (ffEarth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2;/5i/fuauiz 2q26l.bmbao11oqzj n w .0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis throu1bnzzm/lo; a61.ib/f2iw2qq j 5 uoaugh 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. r0 y-a/irbfq1lgm:rg ow4d8 has 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire ogtbs7 x5fq 6;zf 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 rect 5ynvw6fwm 5gmf 78pt8angular loops on its 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 tfwvgpy8w56 mfm85 n7 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 ch7r xy:5c)q8nj4nv t 05: lcga-qdul100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct r3yz 8r2pg(xg5ap -h na simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the phr8 yggnx5p(- a32rzrotating 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 maximu *z9b,odq7la hm $emf$ 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 have1k6ab9njo 0 *izuxt5 r a resistance of 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 resistance of 6.00 W. The motor operates 3yys7+8uaxxtdcxq6 ,unq ..f on 120 V AC, and when d+t,7.xaq 8s3yu ux.cn x6yfq 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 W is connected to a 24-V power supply. 1+ hmdrrvz1; 7)cpi9mykft4e (z 6nbcThe operating current is 1.0 A. What is the sta9 mbr 1() kfdcpy+m7nzr4zih c6evt;1rt-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 5 v wd9bh5ycmtcv302fsupply. The operati95bh2f5w ycm 3vdv0ctng current is 1.0 A 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 power supfu6*d n/69gs vuw :ydk6dg/nj ply. The operating current is 1.0 A at full speed. What is tfdw:vs*ynd u9ng6k u6/ g/dj6he back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltm3rmx0 y d o,iyr87h*mage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow 6: t2 k.ojsvegin the secondary. How many turns are in the second6 kjog:tv2s.eary?

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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 man p y(v0k-(f.l rj/7 yfql*:djxyib)mvy turns are necessary in a 110-V primary if the 24-V secondary has 100y vf.pk7 y b(l0-v q(r/xjj:liydfm)* 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-turn primary coil and a 22/ b w4jogoi6j000-turn secondary coil. iwo 6j/o4j2gb If the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efficienc qw:gcvj1afxt )r5d3i8 wo 3+oy, how many amps at 24 V can flow in the secondad8x)3 w 13aofwcr:5 qvjgo+it ry?

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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 ad s/t14dedig 3h::f 2 j1x8(g;ijryg f- otmqit 10.0 mA. The primary coil operates gfdjigiio fjy:qmge8 (d1t;sx rt4 d1:3 h -/2on 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 primarhgp chc.g:),es 30,yrg xee; dy coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is phcpgegxe)0hgs; :yc3, e,. rdresent 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 a5s t , :hhunpbn90g.f,iet1x300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what cur h51 nx,bhe u,0tantpfgsi:9 .rent 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 transform gx8-6zx n2cxmer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output currx2xxc8n- m g6zent 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 im,q..c*ug/ t y;x blffts secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secu ;f bmf..q /gl,cy*xtondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. t,s foe7y9.dp If the power input to the primary is 100 W, we can expe ep 7f.tsoyd,9ct 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. The voltage is usually swa)m:amdi: ir,(9 tkctepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the sem:9)aw(tki cm ,ra: dicondary 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 ku.mcfluz: f ngm l455t3dm,7current at 120 V. The voltage is usually stepped upl, u7 f muk5l43t5mz.f :cmdng 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.

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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 volt*a+ qiwfk 6jh5fv1 *stage is usually stepped up to 4500 V by a trqwikf+a5vh fts*j6 *1ansformer 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 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 rez5t4 dw3/l3 ,rligsz gsistance 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 ratio of 100:1. What percentage of the original energy would be lost if tr i,ls l 35g4/gz3dtzwhe 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 resib;ugzeiohn1 ctie 5b;w ;5::astance 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 ratio of 100ce oi;hubzg;5n:iae;:bt 51w :1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power would be;vq*r wmu1rmj)hd-t. lost if the power were transmitted at 3 t;)qm muh -d*jrw1.vr000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted.d k+qs:)ob f/t3pnuvk *eo;m 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 in tn b*du)fpm3esk+ /v.q:k; oo 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 7a o :cy lpm.lbjns/.:5.0 A. How much energy is stored in the coil's magnetic fjsm . /ap bynl.cl7:o:ield?

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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 contains408q-jayxd 1 jn 5kk:eq.kt qsi/ r3mw a 6.0-W resistor and an 18-H inductor. What is this circuit's 3/s qtqidk5. 8x :r1kkyme 0 nqwj-a4jtime constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms volte 0y9ba1(p. ,eimjas gage 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. Wfs954 o dz+t c6an7jmkhat 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 out0 bej 6r-0ft nw.t1j k4oiofi.let. What is the resistance of the lamp?tfno4t .ij k- rjf0i.e w60bo1

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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 12c)(p1x,qfbx a: 8kz g*5tge my0-V ac power supply. What is the peak current through th(g8 g5 : 1xa*ypce, z)mbxtkqfe 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 power supply. Whatscujjsu0 dqy bt8b:8ydi( ::3 is the power dissipated in thsdb i:8qb0uyc(:d sty:j38 uj e 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 aj eke8sbr1 -b++oijv 6 50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistob oiw i6mk7o41r 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 resistor is ;:amsua -h wa9$I = 0.80 \sin (240 t)$. 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 )d.v k fszxb2)inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 1000 Hzlb bb-i)1ha e/(wlgh:?

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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 14.0 W +qk pas3, /yjzz8js7kof 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 ne.1oym -hel2m w6x9xtocessary for 157 W 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 i6 9+.y1 dqc+hgdgoq lmnductor when 120 V AC at a frequency of 20 kHz is appl 9ld c+gmodqy+q 1.hg6ied 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 sour/ah*w ufn;hjm r;d(s-ce?

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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 ol ++al o8q*mflf 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 capacitive reactance ambg 8iaruyl 0m :i e,u-x+qfz68d5owlu*r ,,s t 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 aqv7ikev68y xxy 3 s sm:vf01;ukkd e0, 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 capacik ncjnn27h 7;ptive reactance of a 0.010-mF capacitor be 100 W?h jp;7c2n7k nn

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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 and 8e n-zdm /9ci6rgg)hn5.0 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 9jbnn0tojp3-z+i;rlyc2+ k r an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W cai 9crp;zj+yl bo-0r tk+nj 3n2pacitive 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, anyte nbr6cse+xd)hc66 o ;6au; d 1.0-mF capahcen6e6 abo;)us6td; cy 6x+r citor 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 wl /wx2/edop4 6 v*8xzewe ;l/*omza h100-W resistor, 20-mH coil, and 1.0-mF c4el oe 2 zw6d/azvpwl*x* owhx //e;8mapacitor 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 a 20-mH inductor, whm/ av,wa9e,x fnl;vj 5at is the impedance aavj, / xnl5;f9aewvm,t 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 ism ),*(sb bdwdz connected in series with a 20-mH inductor, what is the phabszmb(,w d)* dse angle 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 and 1.0-myvdc-cd/0rby :j) ) rqF capacitor foq: ry-bjdv0cr /d)y c)r 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 need2p rgi16 ,m2ff-l tkzked in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W r2g,kki-pf z1f26tm lat 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 atyyv /a24cd+m f 5000 Hz for a total imf ycdy4m2+v/a pedance 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 sq obmrl f9ewnowsc:2 u)0)1 ;series with a 100-kW resistor at 1.0-MHz for a towo; lo)qf: r21bsc9 e0sm n)uwtal impedance 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 imphscwk-n 5ke auwl.6u8 )mop 57edance at n6us- pwo8aw7kc)5 kem .ul5h1000 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 2u )ozpfu9e;l2 jyzl3 10-mF capacitor at 1.0 kHz for a total impedanc o ujupl;z223fzy)el 9e 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 ser 5fh hf2iyz2e7;e+gkxs1g4 m wies with a 10-mF capacitor at 1.0 kHz for a phase angle of7iy 2 k m2 hef;sfx+4gghze51w $40^{\circ}$?

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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 sespxks-uz22p ( ries with a 30-W resistor at 1.0 kHz for a total imped- skpup22x zs(ance 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 g mcgc;jgue+6 i*mxb4. ;0a fza 100-mF capacitor at 120 Hz. What is the phase an.m c g;c4 x ;gbu+mfa0*zig6ejgle?

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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 v7m4s5c hwa md6i4a5m Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are con 54hm i5am4av6d csm7wnected 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 resi7*5 z-jixuyl pstor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit y57u*jz-li px?

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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 czhm8 xelg g pgutd4 h8ut67g,r7 h.73japacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power sourceugjg uh7g7t 6e,m8 xl3t r7dhg p4h8.z. 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-W3d 47n jb6kpl ngtl a-d8s.u7x resistor, a 10-mF capacitor, and a 0.45-H inductor, when connecte4 7bx.d7u- s8kjlt pn6n lgda3d 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 uzk6htzg t:6eqiu14hn c5 2f6phase angle ofez66qf6 ztic 4hhnu5g :2u1 kt $40^{\circ}$ 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 u/0m-v itgc c/W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in ordegvt- /i0c/cmur to have maximum power 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 in an ac series cigeeos .p.(3 4ivf w7 rnn/xth,rcuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reacfon, x3sit pwh nr4(.g7.vee /tance, 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 circ5 jtttc0oe/dv)s zbs n. n,)r4n 732wmuw3pqo uit 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 60z8t4 yhx4a pdzl19hx+i y1wi5 W and a resistance of 30 W. What is the power 8zdi1 tzh9 +5y41lxpyih x4wa 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 resistor,hkjp2qdx / ov zso553s8k ic42 a 10-mF capacitor, and a 0.45-H inductor, qospv 2ko4/j28x dhzc k53 si5when 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 capa md tqcq4x pz*i5/.;vvs tq0--thcan /citor and a 15-mH coil in series?zq 4cd5/tiv s.tc/qnavqm-hpx ;-0t*

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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 capacitor1 0kji w3a+c5vnf mg6w for a resonant frequency of 10 kg c36ikj 0av1fw+mwn 5Hz?

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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 inductorbrxh4zs 47*7 :f- ipmjdc:qo 4dw ;uga for a resonant frequency of 1000 Hzgd7os amwq r:j4;ixd4 zpc:-h 4u7 b*f?

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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 seriei 6xcr-/7mgy ds with a 30-W resistor and a 40-mH coil if the resonant freqc/r7diyxg -6muency of the circuit is to be 1000 Hz?

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