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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 ob)+0 /68d.xls0g tjwk zr6qau 50j x2sgtqjpff 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 induction states that)rukrbwnu 4u2ubn d)*os2c3 2 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 z3nlgoc :a +c9/eojh 2dx(:2yhus g9cwire in a coil produces what kind of change on the induced ca:o 292jh:doeucy3 cnx/gslhz(g 9 +$emf$, 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 loop7j6a k;uxk1jf of wire produces what kind of change on thex;ku aj17f6kj 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 of changl sarycou+n ;3zrcm31* rf9sg12rf mymdu.23e on the induce 2urs3fc2r rm ;. fcmo *9+gundyy311rmzsl3ad $emf$, 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 magnetic6p ck l +q/(:afqph6w a2j9njp 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 laj+k7m* x4+ieafu59,fidalk s6 rp7 bgw, the direction of an induced current in a conductor will be that which tends 7 peam 5ud kgs,7*+4 a+rjiki96lxbff to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abiy: t/yux8rk 2q 2rem*31lkacove its center with its north pole pointi/e 3*y mr 2ura 8kq2yckxil:1tng down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horp4dfp:k / 6pssizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it apds 4/pf:kspp 6proaches 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 magnetic field vecto0 i4 thf:cuc h19)qlijr points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced currefjlq) c:4u0hci1 t9ihnt 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 vectfirzw;-i obl,yeq-n8a )*;csor points straight up. The magnetic field suddenly grows stronger. When viewedr;w * 8yq ;bfose-na-i)il,c z from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a re63rixwgsot +:m:9zmnf;;sr 3s*u qgn gion where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current if wgs3m:r6gqi: os u s9*nntx+mr3z;;n 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 onytug(e/(/kbcm3 k, lj dqr+*g a horizontal table and carries an ever-increasing current northward. Two cmjd /t (klc,g/bqu +gr3y*( ekoils of wire 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 , f(rz,pk*7ojml r+arpole entering first. Ak+(r jor7am ,pz fl*,rs the north 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 angulaj4j)h1pb r)hwf 6x/tvr speed about an axis whose direction crf vpj)jt41xb 6)/hhwan be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an,os52k 3xv mkgvog9f. axis whose direction can be varied. In a region where a uniform magnetic field points straight d.ovk 3f9gomgkvs5 x, 2own, 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. c+v70m,sn nbowrip)fk90c xn x); fo2n quy+7
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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 andqm 3nu 5o(k1dn bu.m( $emf$ 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 ma e:en + h2oesdwn;0sb;nsl f/1gnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (orientei5r6z)t mtgd7c 9:dn,g6c b ezd in the east-west direction) is moved northward at constandb d5:icm7gcrez)6,g9tn 6t zt velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant ae :1.c3*pu,gfobs id;og*ve y ngular 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 trans29/exyn :dmm oforms

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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 g;inj cwl9et,j g-a//0r /ycjthrough 60 revolutions each second. The frequency of thgt0 argjec9/yij/l;/ j c,w-n 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 /*t0ftgp,0tmypi(65 u fexzoto

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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 t wwxhtjv g;7n00)*pu ohat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more m8ea yk8-t: jcloops than the primary coil the8eyt:k aj-8m cn it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if r ,uq+wxr*p22nxi4xbm zm ,;s. nyyz; the primary coil contains more loops than the secondary coil then it is i+r.x xx4mus2zpr2w,m*nqbz,y;y ;n 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 inpw* m2/yos4 f3h he a-xyzlvc/3ut

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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 circ 3qxcvfl/i,hp//refqwl( j-/ uit,

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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 ynk:)zz csztx0y9p 3l6z u;7sare connected in series to an ideal battery of constant terminal voltage. At the moment contact is made wiz tlzz6sznc:09)uk y3x;y sp7th 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 ih;t53qeird p25kuk: in series to an ideal battery of constant terminal voltage. At the moment contact5 q5kde3pt;: krih 2iu 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 inductacl6f2ri.uyt+( p g ux8nce L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is cot98a;sf k1lhuy +aen,nnected 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 in series to a battery. Thw9nj wjp *m6nc1:vc o:e time constant for :wjcmncj1 6vnop*: w9 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 inductor are connected in series to a battery. Th.f7c*d(17oi zuesvq we battery is suddenly removed from the circuit. The time constant for of thef1*ie.wcdvqs(o7 u7z circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units v8j7;wpj fcegi8**xiqctu/8 ,awvo/ 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. On this circuit,gy3rlh/6u o 7q 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 t dt mi db4smcx*m8y;by0p 7d-;f49xy foq2+tdo an AC power supply. In this circuit, the current*mt-ost8mx 9c dd442+;;yiq dm0 byby7 dxffp

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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 s )8hnbnxy0 hla0z/d2uu ghg n 1(thj-vg* w94when the frequency 9z0djhnxghnt hgh*-8nb4g01) saywlu2 ( / uvis 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 nxna s+x2 74neb 9qp+jy,sp6nthe AC voltage across an inductor is doubled, the inductive reactance of that indub7p ++4 6n, snynxae2jp n9qxsctor

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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 voltag)4q :ww e+ph t3zqg2uge across an inductor approaches zero, the inductive reactance+q)u24 gwpwtez:h3q g of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circhc,lst kt 3jc5s)he3;uit, the curren ts 3sj3h5cce)lh, ;tkt

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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 facto84(h cse ehea .9pvhf3r when the frequency is triplhep9cs(eaef .3 8vh h4ed?

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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 +y(e7bnpmn2k9 wv x wz0.l6z ccapacitor approaches zero, the capacitive reactance of thatz(n m+ lc2.6pe9 0wnv7ykb wzx 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 inducw.wo;y)c: xcfg vno*bv+ m: lm-sly/k;-elv.tor and capacitor in a s: .lygw bw) vvk-+m .;e;vy fn/mc*olcxol-:RLC 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 circuit w-z:mhb.v4 lrs;v v g,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 ,34y1ors1cq9zk9 js m szhk+e if R increases. When is this statement truomj rc3z+,s491yk eq k 9zssh1e?

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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 th 1a6qqolyfze5 ;)cn 9be 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 impsq*w0fr -6dztx:yunku 639zxmo3.o redance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series ccffexik 1pi: -nmp-xjg742;t ircuit, the resonant frequency of that4x 71:n extf- ikf2cijp;m-pg 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 app-yyv90vx et- slied 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 occurs whe g lj kikh1(qgql yb1x)l26dkrm7)2 6mn

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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 ine6:q /esij2eg a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the :26gse/qje ei 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 0 y.4tpn uppm1uniform magnetic field of 0.20 T. Find the magnetic flux throughu p .tm4pn0y1p the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a unwr/9zuris dj 7r z*t;/iform 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 anglu7/z;wijtr rr z*9 s/de 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 ad*dq 1s6vj rgt yn0;x9g g7wx5)( inehdjustable 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 ch2 ab4c.a6sbjd*eqb3f9 sw35 t zp/nwm anges 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 18 cm. 4*x.bna s9ppd A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 inbpa .d4*nxps 9 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 a 1wts1gcuwr 5j31czvp+ 0dpc4nd 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 arew.h1sl ua),z ea $0.20 \; m^{2}$ 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 locatiorlu )tys4,/dje xcb, 8n where the downward compo 8urx,4j/sl ,b)dc ytenent 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 i arpqs6lmuy*/(sma01,(p mf rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends ,ummqi ar0p*a (1s /( fy6splmwhile 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-sectiona ;8 mhsgl.3:wiu,wpzb3 pu3stl 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 tvwk0s 0nm sm-,urns 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 loop isrq3(*ke9u6s,eye x p n.qo +fv 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field o okfx qq. 63+n9rse*vp,(eueyf 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 turug/umyz (l61h5i (f nwqi5 ca:ns 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 construcz3 r;bh7cv 27jiokpd 0t a 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 t 7 bkzp vi;rojh730cd2he 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 withn5ryrd 394 e r;dno7 o1xdfxacq (1)wr 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 resista tlanh5/8ti*o9y zpmvzx.i v-n)9p3 gnce 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 mot2n-(s1pagkwfwv +oc(ovjw;xv( ax9;or operates on 120 V AC, and whe f(2ox-( pv;+w(ks; aaxoj1w g 9wcvvnn 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 resistancks2h cuaco1;:ych:/d e 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-upc:ahsuy: /c; ck h12od 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 interna b;pbi* 5fr9ktl resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full spe; 9pbftb *5irked. 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-V2vtx 1 -pr(,(:vbyfh/ ccn qeh2cg-(c o6d trn power supply. The operatiq2d 1ccen2x(t v r h,:(hgc6y-ft-rv(cnpbo/ng current is 1.0 A at 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 nkq:le/ z0 kqh/,hj hvd;cuf k7 wv+4(heeded 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 zdnf5.k 9xwl.*, jqcito flow in the secondafi, w nkqc.zxl jd.*59ry. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how manyhd5 8p+z gmbn(ir rl t67g1eg, turns are necessary in a 110-V primary if the 24-V secondary h ib(6ggte,l1rp7hz 8g5m+n dras 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists doa(f 9c 6 nes;6q:yamof a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the cuy6dan omf(6;e a9:csqrrent 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 primfun6h esdetim7 )6s0 (ary of a transformer. Assuming 100% efficiency, how many amps at 24 V can fe (6finhstm )e us07d6low in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transfo*x68 h xmozvl0rmer provides 7500 V at 10.0 mA. The primhxvlzm6x o0 8*ary 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 ane* sd)tc/v z-gx u.6dtd 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is pre*6 z tsdvdg)e xc./-utsent in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on it5d+sgbrtqvv)f07wy2.m y7r3wk d k u8 s secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the seconvy3rv tds7qw+7ryukkg. 0dmw f)b5 28 dary?

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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 itsbg1gq yxr.:bd(2r; x n secondary has 200 turns. If the input current at the primary is 1xrxd1 gr2b ygb qn;:.(00 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tluh.ux,1 hktsmoci1 - cc),r -urns. If the input voltage to the pc-so lruix-.k 1hm) u,tch,1crimary is 100 V, we 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 traro,c mzv(upwqz:+8x22 j5tqt nsformer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary mqwzuo tjvq 2r 82,xp5+ct z(: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 stepphdft5p4 46mvq ob9u6,5 cmfr ked up to 4500 V by a transr5c4 6bp9m k,fm5fht qv4o6 duformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of cw1nogh*2 3 mhym a-h6durrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resista-wm2hgo ymh3na6 * 1dhnce 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 curre)dham)bh 0l8ufljn 0 z9mw9p myq,8 s+nt at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in fmmq d 9 wl)mj0s8hnp9z )b y+8h0,aluthe 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 p;l6h6,j6p 4 mzeoz llW. 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 the tra6p6oz4hlj z,p elml ;6nsformer 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.h /8crgx/ yy0b;7+jp6 svsbmw60 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 ocv +/xryysg6;bb8 pmhj /0ws7 riginal 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 xwqq *xr;6 bq21000 V. How much less power would be lost 6xq 2x;*qqbrw if the power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator3/09p *m qgx z86k;qwj eixzcp is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generato9zq3eg 8m/ 6xpzc* jk0wxi;p qr 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 energy is stored in the cp::cri3zc 5srptt,5j oil's magnetis3pcrpt5t,:5 z rjc:i c field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor l1yz*24zw cfm. What is this circuit's time cons2*zmzwf cl14 ytant?

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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 120 x/e yhy bn2hi 2z)d/rq6ajty07 .:agmV?

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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 i8 w:ayagkt v(7nto 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 the res )a6u(0q2 y2kpwpshb cpw +x1pistance of the lamp?phu0ypb2c1w(w k2 6apq xp+ )s

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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 con- y:tyii 1t+zanected to a 120-V ac power supply. What is the peak current through the resistoy :tz-t+iia1y r?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac ps y/arruq5ywuml irr2 52;p /6ower supply. What is the power dissipated in the resisuiwrryrsa ; 5/q2 rlu2y5/ mp6tor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor isz(q3n+ v rcvs3akjqd:(q 2mg8 $I = 0.80 \sin (240 t)$. 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 4aum t0-vbrmsy y(/-nk7pi 8k50-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 res-evj 9if0tb k:istor 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 /8m, d f p k)os0dmwo3 4smo7-c-hykln/g 1brkof a 1.0-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 ft7g5s m4 3ilwzyw-/yq veq74 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 184j-gm i9 xmgja /w(nl4.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance au zxkt 9vi60f2z9a1 qrt 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 k4tw1f(yn l //rwts 8rkHz is applied tn y18rkws4/t(tfrw /lo 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 0, v.fiv6ktyma 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 caj ,.yp /h-csarpacitor 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:-u - krub/vjn b.eir9 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-m:p2 x-qhkd / c6ws2fpvF 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 ofdfyc**tw arnf5y +l(jj l:p1 , a 0.010-mF capacitor be 100 Wl l1t( *yc wdyjj:r,5p+n *faf?

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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 throughxa+h. m5izo 7d 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 ;7pehw elwf)( u/ mtsmg :3s)uwith 12.0 W resistance, 15.0 W inductive reau/)3l)sg s( f;mee: t7w phwmuctance, 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 resr f);zmshu)g.*oy jx9 istor, 20-mH coil, and 1.0-mF capacitor are cony.jzhs xufr) 9*)gom ;nected 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 re:rc8*otv y*mcukg 0amx kz-+; p xk.r7sistor, 20-mH coil, and 1.0-mF cz;km. ovk xtxyu -*m8gpc c r0a+*r:7kapacitor 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 serie9th6o(wd-tii ju6bd+u6+ gum s with a 20-mH inductor, what is the imp6uuw6 d+uimjd ito9h t-( 6bg+edance 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 is k/qvx wtloh wm+4k** co5q53ythe phase angle at 1000 Hz?tw3/oy4co+kqv* k xhm5l5qw*

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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 ser9 ,yd2w dnsv3h8awr,t0 dx;tu ies circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 1tyhn9tw8a30wdrux,d,v ; 2s d00 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 neede4l3xdj oiue4g0)ysd812 cl z cd in series with a 100-W resistor and 15-mH coil to get z 84leig)4jycos20 udlcd x13a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with d 8jh d*s,foh0a 450-mH inductor at 5000 Hz for a total impedh *o,jdhfsd8 0ance 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 wi.;9pv rjg+p aj;;ez ge9lvot9: cx 3ofth a 100-kW resistor at 1.0-MHz for a total impedance v3 :pg99r .;gj+tepax;;voo9jelz fcof 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 capacitovd(f3bwhc 4 y:r. What is the impedance b:(cwy d h3f4vat 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.x) p4ubwfj +j* +-zixhv sul09ick66a0 kHz for a total impedanc+ xup6h0 4v*s9zfkl j+ii-w ax6j ubc)e 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 1.0 kHz lfd,8ubb7nh:g, yr- eruf4.q for a phase anu-ye :,gf8r f7lnd, bb.h4ruqgle 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 resis. 3 v.gyxvczo+z/9iv vtor at 1.0 kHz for a total impedanceyvv.zio x.gc v+ 39/zv 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 Hzj:v y*vt1*mqqsk31 9rycdng-hj s+* s. What is the phase angltk:-qs*n1g* 1js y+dsq h9c*y v3 mrvje?

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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 resistor, 20-mH coil,n,ckbfm8+cm tm*fv 41cra m5 ; and 1.0-mF capacitor are conne, m+v ;*mc45f cm1rfcatbnmk 8cted 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 capacitor, anjtcxt64y9ld sig ( -f,i.cc b9d a 0.350-H inductor. The circuit is c l.cydcictsi46x9f,-t 9(gj bonnected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance z2)d1 b4nsayq3 4q,elk7jndoip w46z 30 W, and an inductor of inductive reactance 30 W are connected in series to n,nj3el) d iq4z6q4o b1ayk2z d7ws4pa 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 seriesca0y, k2 re7 .u(i d)t nn4:pgazjsp+b RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, wa j0+y:brk4dn2u ),( sc7pp .gzt aniehen 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 resisto9 dr1ict4na,xr4 ot )fr for a phase angle of),ardtr4fx49ti 1n c o $40^{\circ}$ 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 Wcd:,w9 9npv43v izhpdn( uzn. , L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to haven3z ,pw:9p9hvzu idn(v c. 4dn 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 circuit with 12.0 W resisge.v5i+boo u5;u ck2sxvw9:i tance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is conn ex.s:i9 ;+ 5b5vuuowo2civkgected 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 araj. (9 .g zvduc3er7AC 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 impedancexjy9. o 4hok z,yb:8uv )1kshxf8mr0e of 60 W and a resistance of 30 W. What is the power factor: v b)yz0u4hekfx.8yr,o 8hk s1jo9 xm?

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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 fou ng1gjz6* 0 srx,k-rpk*yh8o r a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powernh* k81x j,0yr-gkops ru*6 zg 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 1t1s 9 z ;pmx 5nc7bso)ix2rah;.0-mF capacitor and a 15-mH coil in series?)xpshc9 xza t725bsmoi;1n;r

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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 reson u+;elwjyd;7 usd(mf* ant frequency of 10 k 7le(+du *s ;wjmy;udfHz?

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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 resg3pze f*(hz s.onant frequency of 1000 Hz?(3 s.epgf*hz z

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W .fev(gcriowti ( ..j yvh7k3:j e/tj0resistor and a 40-mH coil if the resonant frequency of the citr 3j.( y/.vei oc7t(j:ekjf. ihgv0w rcuit is to be 1000 Hz?

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