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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic fluxse c;mry2p2 +z5 n2pho 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 sz4e fwsgg,(aug6 3 3sgtates 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 +8wvf;)asd duloops of wire in a coil produces what kind of change on the in8dafs;vdwu ) +duced $emf$, 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 produces 8h2eivra* ,jx what kind of ch ixev8h*,a2r jange 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 what kind of3uq+ic9 iij d ln9 mbl-u-r8ick (z4x0 change on the inducedk 3m ci(qjni-9rcbl9 li- 8ud4u0zx+i $emf$, 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 magnetic fiz5 ffr86ik.hyv- r g5held 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 ddeoz cn4 ag5;+irection of an induced current in a conductor will be that which tends to produce wa 4cn;zde g+5ohich of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizon3hr k9lov 9:c;l5 rwdwtal table. A bar magnet is held above its center with its north pole pointing down. The 3l9wch:l; k9 odwrv5r stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar y +v:hp2qn hn8x*/vwh magnet is held above its cente2/y+hw*hnn p: x8vvhqr with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the mv z16e voe+i /x)kav8hagnetic field vector points straight up. The magnetic field vanishes sv) iv 6oh8x+ 1avkeze/uddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a regibcfz6hz9 fu 40on where the magnetic field vector points straight c4fu h60bzf z9up. The magnetic field 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 horizontal table top in6du0y +)mkwen a region where the magnetic field points e u6k0ydm +)wnstraight down. The magnetic field disappears suddenly. 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 a horizontal table and carries an everfyv ljy3w z0ip/g; l8oi p*kehk 37u2(-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, l ;y3ioj80 gl7vhfk2p(iw *ez/y3u kp 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 thk8fc)wb6)*pyv ( (sci+olkzcrough a loop of wire with the north pole entering first. As the north pole enters thecc8 vboifsp +z(l)6wyck(* )k 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 speed about an axine ;sxex1fwud/21 *nds whose direction can be varied. In a region where12de/ s1dun xw* ex;nf 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 angu;*2 yo3z *btt ujgqr.wlar speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what muuzr3 *w* g ytq;tjo2.bst 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.goh.:s0*hkko g-ut* y:cvu;a
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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 that2e pd-v pr8ajf7 1oq0/m5 yaer 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 fielsj6k. : :p asyh3of5wz6zi u-qd. 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 easzgsvep ; 2yv4*jm l6,it-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 rod. ,6ep2vvyi*lmsj4g ;z

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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 rotu( v6u/g bz-4c6)wfzo c+hvaf ates at 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(rg; nnm))dja transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each secoy -6q8ue :emaknd. The frequency of thea uym6 eq:k8-e $emf$ 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 td7u2w3 )rhtk8y shu (qo

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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 tce 9;qk 2k*;q)ypgxqfhat

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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 conrl l810t iv.ihtains more loops than the primary coil then it is a h1i vl8tl0i.r

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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 co9:sxenhjh-r oq pe(0/il contains more loops than the secondary coil then it is :e(jer/9hxh0pnqs o- 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 inpqrk95p /x 2hjkut

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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 cirn 75 pt:f twrbas/-9arcuit,

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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-qff;w sdui6zq t;s :7 an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage a qz;-s76i fs: ud;qtwfcross 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 idl0 mfks5zn4ubgi . v-p 9zjr+:eal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductor :54pzlj rnvz- fu mbki g0s.+9is

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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 resista 3cu zc(er1oag*fow .4nce 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 cg2gdip)2 p m37foz ,leonnected 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 inwps o6.jw rsg:-a15be series to a battery. The time constant for the circuit represents the time required for the current to reachpbowj. srw5 se1 a:-6g

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. spb y)itz)o 449dw1ic9 q ot9i The battery is suddenly removed from the circuit. The time conoot4pb)1id 9iyw cq9t si4) z9stant 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 have2uhg7u:q+ p;7d 8,il joh zobc 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. ad,hfa p18 h5 h-xp2w-)yhapg 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 powix 6b0 eirf+rg2/am4wer supply. In this circuit, the curreni2w ag+m6/iebrf 4rx 0t

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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 jtb; kj9s ,kb;by what factor when the frequency ib ;bstj, ;kjk9s 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 vo ,n 8wj:s*cqxt:c-rus9(n;r ayd b6pfltage across an inductor is doubled, the inductive reactance o-n,rd(n:atc*ucyw s xb;p j:fr8s9q6 f 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 in 8g0zu ejl70vbductor approaches zero, the inductive reactance of that coi evgb0jul80 7zl

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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 circsl(6 bwif/) mauit, the currentaf6biml()ws /

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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 change+ cah dbudfo3x 5gusv))6 s1t(5zzq 4ps by what factor when the frequency is triplhav +pg )uczsos 3uf)1 5dtxb5 (qzd64ed?

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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 voltag b,k+ 6z,z4dv6gvx7d by3nxpue across a capacitor approaches zero, the capacitive reabp6 nb ,zdv7 zg6d+ yx43,kxuvctance 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 xwfblle1 ;z-z3wpz0-voltages of the inductor and capacitor in a RLC series-w0lzz f1pzxwe -b ;3l 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 circuit is d mk0p2p;s/al0) j.zcwd;-kismjmp h 9efined 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.8-bq:2 /jtrp ev2kdf i The impedance of the circuit increases if R increases. When is this statement qk/fj-vet 282bpi dr: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 thq0hz)2x.m zaihu 6)lpe 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 circuit increases if x8h mgw,m tau, f9. -5rp2ljrw$X_C$ 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 dhlzkmm;l:p2 l)e .hq *ouble in an LRC series circuit, the reson; 2 pe)hz.ll*khmq:lm ant 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 applieds.tank) ikqb (6:*h 4 ck)zp1abumf3 u 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 Rri m)k 9ls,8+(w vhr.+jiwmkzLC circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field o8vkmh,7usa:bk p extp)s-4q5m0 r x+af 0.20 T. Find the magnetic flux through the loop when the plane of the 4x h-a 5v0 re kt7k+8umm)bs,s:paxpqloop 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 una3.e qqyn y;/ub h*bb(fsq4)uiform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic ybnab (3yq.h*qufqs)/b;e4u field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnet h/6jpmwf7b- 0r(tjfhqz0rtn u-w o.4ic field of 0.20 T. Find the magnetic flux through the loop when the hj -ozuf/nr-pfb0 r 7(j4.h06wmwttq plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reduced from z t.4kl 2h 8xmp x)ec8+(xdgpt(i(d jv$1.0 \; m^{2}$ 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 fr6 k+;qvus2wg fom $4.0 \times 10^{-5} \; Wb$ 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 frame4kklct:hn :w-qpexk 7; ys)1v with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0. 4)h7 pckl: wvs-:;xetykkq1n50 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 o) e-zp)dop(-g yblq2 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and a9turle a*.aq z.9 1vijrea $0.20 \; m^{2}$ 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 fli, c2 sskd7k +-ifai,fues horizontally at a location where the ku-fiai7k+2, cds,sf downward component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant dzk5egfn i gj2y:r6e(: c;1 kjangular velocity of 2.0 rad/s about a vertical axis through one ofi5eeygdk6:kr j f;2 : g1cnjz( 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 cross-sectiortk9 qr xj2/0wnal 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 1 rb c,f n7x(0.wgrwni8b m:k,x00 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each looo/o.q0; oe/n h scms-da:rt /dp is 12 cm long and 8 cm wide. The armature rotates :/0n /r-;q /oc.edsotd smahoat 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire 456van4wx),pw5c 3pahpeu lr of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC gener;, :3gzb:d (mhkrmufiator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field o3: :gmkmd izb(ur ;f,hf 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with2h: l,lubr-r u 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 o+ o9ygs.opph) c6tw0 motor have 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 hk bf r4qv s4lt:bn5o*6ave a resistance of 6.00 W. The motor operates on 120 V4kl *r:v 46q5tnbobsf AC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resiszu 8zv g6p7h9 lnvsa83tance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. Whapv8 3hg97lsu6 vz8nz at 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 resioat6 f-uymg4m4a0xai j w wqg4f9 11(istance 6.0 W is connected to a 24-V power supply. The operaawioma fj u 0 xwyf1am-4i t(g6q91g44ting 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 cpwsp 7.sn6egb 57:hd fonnected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the ba:g 6p.ws5 7nhfd7 esbpck $emf$ 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 needed4i p64cpo9pag to 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 causes 14 A to flow in the second: i;po-j (4v610:c7fn*chfft1 zkyz voxq hseary. How many turns 7cs qxoenp ;ckhytv z:h ff:(1vi46 oz1*j-0f are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necese*(vwhvfib ;fvf 5. +tsary in a 110-V primary if the 24-V secondary has 100 turns?b f5vehwvfi.tfv*(;+

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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 szje7. 0 voku:( rltz8 b*0axzpecondary coil. If t z *up :obz.vka(rt7ej0x8z0 lhe 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 primaryotxp3)r f.cq(sh a+ ,g of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondaryx)(qa3gh ,+fpo cstr. ?

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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 ne, kwbjb)/ 4umbon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What doebubkwm)4j/b, s 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 tpqj7n4e z7*ppp 5; dxqhaj),burns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 5;p4p,* jqdabn z)7j 7ppxqehA 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 prim9iw t 17af9aruary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applieta wa91rifu9 7d 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 secondary has 200 tz/pub6nf j* d7, 92kljdfjaq6urns. If the input current 9j ,n7b l*dkfp/zuj6df2jq6a at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and it.yw5 o6b1fjrzljncu61(t aw .s secondary has 200 turns. If the input voltage to the primary is 100 V, we cajf6rb (tw6c1za l.on ju.15ywn 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 oqqie zal36 r:ho7r) js) 7d)qand its secondary has 200 turns. If the powej so7qh6q :7rel r3 io)azdq))r input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. T(4.2)qzmhotv0ji wtli jc 3a 8he voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the prim)qj3 0t8( avizowch4j 2timl.ary 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 vu yj bxi gy4.(a+qra90soygdk44w)w, oltage is usually stepped up to 4500 V by a tg0sy rayui.xw d jw44,+ oq)k(yba4g9ransformer 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 A6t:koa 8;z 5zhja*jiuo7 pru. of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of totalu*to6pruzi 7azj ;5a jk8:h o. 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 tota)o rripou15n91m qi4ow d9 tf3l 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 rm11urp or4i wdtn i)99oqf53 oatio 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 totaln3vl4bxh56 bgfn++tz/w* d p.cisdm8 resistance of 0.60 W. A generator produces 100 V at 70 Al6 b i 3dxvwphfnsnmbcg4*++ 5d ./t8z. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power otg vs42lz*.l,:xy bph9s5pi would be lost if the power were transmitted at 3000 V insteadshs. v,5*tzgiy:x plpb2 o9 l4 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 bewlhp *27 gl3;4ntbti ygy3m- gtl+zz/ transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped upglny bp/*w tm;2 7lzg gh34li tz3t-+y 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 energy is stored in the c9i;5udkw(bhryu) w ( sl/cz1qoil's magnetic field?; i(dyuq/ru(9w1 shc z)lk5bw

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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 anxu+e/td:aq8z8 3+ *w a(ticyjqhk)ps 18-H inductor. What is thixt (d:kisj 8y3z+ p*qwq+ah)uc8eat /s circuit'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 voltage in an At;mu)w /xefk/ o/ o67pg6 rjqtC 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 6)m vx e4lnk;yp4frl /xk1m 1ais 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 the w9sfes .c6 f(bresistance of the lampswfcb.e6 9fs( ?

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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. rbk18s c/b(y mWhat is the peak current through the mkbbs1c(r y/8resistor?

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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 c 9-ika2c anhy -vi8lo)onnected to a 120-V ac power supply. What is the power dissipa9 8l-av2-iy)hn iokcated in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resiehjroghwd/v3 g)+;0 k j5tome9q*w z)gs m4n -stor 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 rsj, jfg:,hih2tis j92v /eoy. esistor 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 5;,n9uq fy/1jy)bn rck0-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.sw h1ep /n:td+0-mH 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 coit jw4uki.m6 9kd( f5yu1vz qn0l 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 14.0 ipiw 9a:ba 5z,o*.9d zibtd8wW 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 m(q328 vlqkmy 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 inductor w8 f hi(idsq*1o5pnw(hhen 120 V AC at a frequency of 20 kHz is aphwshi85 (f *1qi(npod plied 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 thr pe.a3(av*tve ough 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 ap5-( wl:udhjjvau 7)h 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 re0k4ymh1/tp ok 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 does a 10-mF capag635mzepe 4a wdy*5gucitor 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 0.010-mF capacitor b1ikj *8)h 2js1cy (yjlh b96u koldxh*e 100 W?(1jb)hhoc 1*s2 9du l8klji6jh yyxk*

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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 throu2rge/; 8gawk tgh a 0.0010-mF 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, 15.0 W inda*h/+lv gw 3-f z8vhheuctive reactance, and 10.0 W capac ahhe+zlw8v -/3 *hfgvitive 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 co:yc /bs814lh ,cqa0ml sjio4 zil, and 1.0-mF capacitor are connectedq /1lio48ms:0szylbc4j, c ah 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 angl nr ;r,xh)f-vhe at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conh-fn, rrvh) ;xnected 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 inductoe v4.f 9eaoe3qyn ,/lnh1l0ecr, what is the impedancel04 1nehev,fc.l yoa9 e 3qen/ at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what iuuj1ka2 gb( q1dt((r ws the phase ang 12 (uau1(rbktqjwg(d 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 a1+ s i19ex zitjpzhi223nxz6akxl 4y0 series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at1t1i ikz pnazih 0exxz+l2y4j63s2 9x 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series wi it)7/bqu7wk zth a 100-W resistor and 15-mH coil to get a t/qz7kt 7 )ubwiotal 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 sebw:hwi 00t2xd ries with a 450-mH inductor at 5000 Hz for a totalht d 20ix0:wbw impedance 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 with a 100-kW resistor at 1.0-MHz for a t(1mfw c85r1 hy(na caqotal (nq1ymh5wc18 rf( caa 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 capacjctjgvoe. : ars; .ddj59 0z1witor. What is the impedan c.jgrve.5w a01zt9jdd :sj;oce 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 set,b/p6b + 1zkvg9i5gua5 )siu4 5 hooef5vizvries with a 10-mF capacitor at 1.0 kHz for a total impedbkvsfv )hvog/6z5 e9ig1ii4, b5 u +tp5aoz u5ance 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 capacitor at 1.phm*k7ecfr9/ re zyr2 8tc) a70 kHz for a phase mry 7r a2zfctc8/kr79eh e )*pangle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 qalsu*.:q t jr(.bph-7qz6 y okHz for a total impedance of 45 W o.6: s.uq-b q(ryl*jtq7zah p?

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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 cfj. abcz1. o*l5v+i wlapacitor at 120 Hz. What is the phase angle? j*fa.bc +zliwo1 l5.v

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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 10xenq l7 iaz/(50-W resistor, 20-mH coil, and 1.0-mF capaiq57 zxn a/le(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-mF capacitr 4l 1ljxi)lf5yha :q3or, 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:514q ll alryijf)3xh?

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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 capacitorw:v :rya7q tm+ of capacitive reactance 30 W, and an inductor of inductive re:mv yq:w7+ta ractance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a seriey9:tq h fjhp**s RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz pfyj p*h*th:9q ower 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 a t/pos4q)mnz27 onqt0g94 v6yo2sm y500-W resistor for a phase angle of9t0/oyvnqo 42m2 6q4)p7snt ga szyom $40^{\circ}$ 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-m pp,f/+lcej has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in orde / ce-,pjmlp+fr 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 ciren;n)1/x-dqqdxw 1mn cuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, wm1-d nxn;wqx/1ed q) nhen 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 eekenlv6- tc tu1+1-pcircuit 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 ipm 74 hxal+4-zyqxfp,mpedance of 60 W and a resistance of 30 W. What is the p4xm x,4lyqa f-ph7+zp ower 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 fact12pyi 8 j3mjo2mqck613m gy7yh)i ab3z;n kxaor for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connecz16 a3)yo28mpijkmmgy1x3kjq372nc y bi a ;hted 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 96fymt0) p fd a6smc6fq;uta)a 1.0-mF capacitor and a 15-mH coil in series?u9d)mcfa6qm )f;tat0y 6sf6p

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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,bd 9ie 7ka6xa capacitor for a resonant frequency of 10 kHz?7ax 96ed kia,b

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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 f wn3ky di7chd d)s9.g(er8wl. or a resonant frequency of 1000 Hz?dk il( rnw 7yhd )dsc.9w8.ge3

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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 pla7.)x jlmd aq1lced in series with a 30-W resistor and a 40-mH coil if th7).jma l1lqxd e resonant frequency of the circuit is to be 1000 Hz?

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