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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 uni(a: iuop4: rbtts 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 induction states that thegc60 fpy7j m4u7 /zohe $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind of change on uxq2p1 ggv fh80s(/ 3bg)el,aebtv2 dy fa12kthe induced2sqeg lf1bd 3gu x1tvf8a2agpey 2) 0(/kh,b v $emf$, 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 throug(tv3+q me:y 2ugx pna9h a loop of wire produces what kind of ch+v3n( yge t2qu9mxpa:ange 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 of change on the:;jupghm;r0 : hgt4c4udkr 4m8 wp8er inducedr4r h:;edg 4 hu;ukjcw48r:80gtm ppm $emf$, 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 magne/+dap sf 4far6tic 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 conductor wz1rk8nnk*:k iq 7iu8asz d87u ill be that whichzq*z87u:sdn knik7u1 8akir 8 tends 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 isk l c/p:, fc1d q7arh*alxg42r held above its center with its north polec: lk arh *q7lg,c/dx4f2rp1 a pointing 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 s2ysk++ df:m5ub p;mklbr5 6af*z g1 tflat on a horizontal table. A bar magnet is held above its center with its nor1atku5 sbldk mzyrb :++mp2fs65*; gfth 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 ma:hqi2 +rakm r:3g -uvmgnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in thik+avq 2g u3rhr-m m::is 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 vecjnhffj j5:;0esj yt,4tor points straight up0 jteynf4j; 5, fs:hjj. 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 in a regi3vrt wh+*s 4,rb 5ebaoon where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this cobs3ob r4e,r wv5+ht*a il 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 ever-/j nv0t;5daw6ow.ce bincreasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced curredc 6;/tv.ea0ow nw5bj nt 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 ol0 tvff-l jr64r2 9hv* h(segdf wire with the north pole entering first. As the norh09t4fhsj l *r ( gevfv6lr-d2th 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 atcgcx).0ep /f*g jh8mp e op,h4 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 orientation of the loop'so4)j*c xe,hg p.epch8/p mg0f 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 h3k.lfui9++ixv* r)z /sp0ugm p9vj e axis whose direction can be varied. In a region where a uniform magnetic field p m3e/*lvpuj svrp +i0u hg9.)fxiz k9+oints straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.linhfw8w 1m9:+zty y: ci.q) c
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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 vu8 5brs-p;0ebf 19/smbkkx wthat 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 fieldusdzm361f q8e-n5q k f.i,c dm. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west directiony1zm ivqe1 6,y) is moved northward at constant velocity through a ma,1e6z1my y vqignetic 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 angular qtcix37ou -qif v2 w/)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 traohm7*c: y9fo ynsforms

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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 throughnixtd ;:ub e8) 60 revolutions each second. The frequency of the8 :d x)ieun;bt $emf$ 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 deviceqd 2fzwm2lnh2- hd0teed4 seq2 3geco;2r6 )f used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device thaw )r55 rj; nh1n27jtt-thc mkat

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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 containsxld:gf4bo1j q3l j.g 4 more loops than the primary coil txod j.4b4 ljl 1:3fgqghen it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops y)0ld9qurtc p91uawayk/fj+s j*. : j xqs/e 5than the secondary coil then it 9q w5s9y/0/p+tdj)xfa: kl*eu1. jyqj r uasc is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inp )x8uy:d vuby4( c:uosut

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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,m)o tcc 4hde6;

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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 an ideal battery of co09(f3+(2trgdrrg mnwhg n m:fbl2 . vlnstant terminal voltage. At the moment contactd0g:2rmb f (+g m hvw9rllg2rfntn.3( 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 connectb+ix fdfz8i2/bvg60-yzv ko- ed in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductodvv6 ffzg bo-z/8kb-ixy20 i +r 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 lp:b/ q g6mvi0L 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 -kh5i+ds-v-w lcdnq + resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an ind +w3gq.w2j enssu+e d-uctor are connected in series to a battery. The time constant for the circuit represents the time required for the cqj ns-+ w +3e2s.ewugdurrent 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 t(fp-9zki9hklrqnj9(a a a(v(o a battery. The battery is suddenly removed from the circuit. The time constant for of th k- 9al( (j(r9kvpzfqai (n9ahe 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 ex4 1 ml9keysp:zcept:

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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 powf)c5beeeizum67/ *(l )qyv7zds9 dm jer supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power sup:4vljow b1;orply. In this circuit, the currentbvj w:o4 1lo;r

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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 civba*: ouqez,(d0geu8eoa ,yt bf29 p. rcuit changes by what factor when the frequency( t2.,byoe :ezeqou*bvu, a8ad0 gfp9 is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the indicvsl,o 2t7 /x v1y2zkuctive reactance of that i7tvk,/ zi2xy1lcsov2 nductor

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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 vo1m )k/yt ,bdkkooxl1-ltage across an inductor approaches zero, the inductive reactance of )/kt o1o,kdbkly1 m -xthat 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 circuit, the curreanmzy4smfe) 8y x3.j-e-4mxsyzy)j8 .mf 3 annt

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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,,kmerbcq,d2 the frequency ,2,q,rekm bcdis tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches s2h i y(cwsf9) c1ko9rzero, the capacitive reactance of thatico9swc(1 h)2r9 kf sy 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 inductor and capacit)xf.5r+a sc kdor in a RLC series ci . d5+)cfasrxkrcuit?

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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 c /7r sql.h zaz9mqkq+lfl k678zu ez76ircuit 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 impedanceg/f, wb 6unv/g of the circuit increases if R increases. When is this statement trub 6gn, u/gv/wfe?

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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 ssompi5 +g7l6e 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 impehq(ap)wnjjz2ewv u 72s s080)qcu.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 bot i9n: lsowiueka7-7h9h double in an LRC series circuit, the resonant frequency of te i: shkua9i7l-nw7o9hat 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 A7:b)q m4kvfvu(afkw 3 C 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 occurs wh(s yndt06 h2.q husb1yen

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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 rotatil oi2q a)d t9y53/mlkeng in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of d) y59ikaq ll/te2mo 3the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.8 0s8 ,l jae8bt1jbnbce ;(kxy20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field ve, (8ebc8ne1x ybkasljt ; 0jb8ctor 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 isd tyu m:x2tyxr0f1f; l9yg *o4 rotating in a uniform magnetic field of 0.20 T. Fin:xy;mtg24ou lx yt1rf09f *ydd the magnetic flux through the loop when the 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 adjustab1-*x- a nhlznd5(li uvle 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 cka8ph , (yx;xc o*yunk)s 9..wvq* xaroil changes 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 o dhh)dbeq 5.einm0y6h. w5sx3 f wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniforw.0i6md bx3 ehns)hye .q5h5dmly 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 turns7 t)sxxhu sb158jjogxgp( 2/r 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 asj,zzdtni65.f 7g tp6 rea $0.20 \; m^{2}$ 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 location y*wp6a4yvjm+5,an/o+y9hx :v-3wgwcd aizl where the downward componenta pv n zaw hw/d jc5l:w*6-+yoi+g9y,43 yvaxm 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 bnn32)8a vgs 4 xd*ektwar that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis thrk )x3et wdg4nsanv8*2ough one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area jp9 vtom(iob5 zfug5u g;;18rof $0.25 \; m^{2}$. 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 tb/xaf ek 31*ciurns 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 isl/hny/)cehp 9 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 of 0.30 T, which is perpendicular to the axis of rhnlh/e9c ) y/potation, 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/wcg l)i* dh ua/nclid1q*k;+ 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 a simple AC generator with an output of se2mksce g g 5bgq6n.k-,1g+ c12 V maximum when rotated at 60 Hz. A magnetic fie ,kc 6k2e g+e.qcsnsg-b1mgg5ld of 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 with6+v qfhorl6eh.7vl 0h a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates on x v; j6l9eh7ife:, qpa$120 \; V$ 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 6.0nm3 c*7 v2-ih9 hh f(jknvjm5k0 W. The motor operates on 120 V AC, and when hi2h5vnv*h3 jk7n9 m-f m kcj(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 connectej)j:y6e4 :x c g7sleujyia*b-hr2 /lld to a 24-V power supply. The operating currj:j clyl y elgjir2a:-)6b xuh47 se*/ent is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internaf tognq/g1 .wv4m(bl9otscy 4d21x*z l resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bac1* fxy(b4zlqsogdn.to w 14 g/vm2ct9k $emf$ 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 6.0w4 mr 7wga4b3f W is connected to a 24-V power supply. The operating current is 1.0 g347r ba ww4fmA 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 needed to reduce a primary voltag7wcy)zuz p 3-fe 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 piizac9 73f6:( va mrjseconda:p i afm(a3 7i9cv6jzrry. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if tv/vz4f1x c . x4(yaxiyhe 24-V secondary has 100x1xv x.y (a4fiv czy4/ 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 cwm4+g s4ix9qq/e 2s /8pyd tdqoil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the wq+xe 9442/sdqtgqip msy 8/dcurrent 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 p42h3 3y t3s3jvqe ro(h.grvevrimary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the seconhhgje3vr (4 3t3vsyve3o2.qr dary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 4s7k*if)n o3etx)mc hn7duy e +m-e4tmA. The primar u d7o)3n emys cfh+44en)t 7m*x-ktiey coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 3y,9vevu:no 7)r ube- s00 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is presvroe7u 9u- ) ,byev:nsent 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 tu0ufs:.lz +5t aixi8 4,kh,jlgnv tgq1 rns on its secondary coil. If 120 V at 2.0 A is applied to h01.gtfa+ij z 5i4luv,8qt xk:sgn,l 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 turns.kod(ch2o j,0e If the input curren oc,2e(o dhj0kt 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 its secondary has 200 turns. Iy)-wi.5dz xjrnj) u:)m-niex f the input voltage to the prim 5-) r)ywjmn. iu)jie zxdx-n:ary 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 transformer has 100 turns8slnln1-dmh(u (bp z -d/p qi4 and its secondary has 200 turns. If the power input tduq 4lzd snln--m(h(/i1p8p bo 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 3 (gyncd)k+1wclc7ta of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 t(kcdcayw137n+ ) gltcurns.

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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 curr8hhfl c+5c -uqent at 120 V. The voltage is usually stepped up to 4500 V by a tra-cflc q5uh8+h nsformer 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 cuzf,.8n 01zno 5 ugbz qajwm53arrent at 120 V. The voltage is usually stepped up faz znq.wza,o 08 5uj15gb3nm 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 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 W. ln ;*v/ tzcai1v is)+r A generator produces 100 V at 70 A. In order to reduce energy loss due toi *rsntzv;ia v +1cl/) heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long ha dtx/8; qpr:gys a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage oqdy/gr;px t: 8f 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 woulc/r ccx cvn+ew i8+9k/d be lost if the power8cncxcw /k i9/ev+c+ r 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 generator is 440 V at 20 A. nq;oqv)ry*us ifsib-p p 7/+5 It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in riu +i p-qps*s ;fov/nq7) yb5transmission 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 c33xncn0y* 4 eulq:bwcurrent of 5.0 A. How much energy is stored in the coil's magnet0*4ybcwln : 3c3enuqx ic 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 resist :kvqi/6ka* rtor and an 18-H inductor. What is this ci: rit*6akk /vqrcuit'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 AC circuit where the rms v . f olx5yta20jdku85coltage 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. Wcbxvnt64 .)g phat 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 resis/ y qf2ozc/w,8ed (7w8zxcgkxkx b3y:tance of the lam7( 3ce ,kd2wfwxo:/ 8gzzxxkq /cyy8bp?

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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 suppz* xflg k 6l8abiz::m/ly. What is the peak current through the :i6kb lm:8a*fl gzz/x 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 powr/bcv6, (*jzur3a p4q 8r2ruwigskv(er supply. What is the power dissipated in t uwvrgvk3r6 bspiuj/(zrc ,4( r*qa28he 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 resistooedc 4bg8;-it : w3ubh(sie0hr 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 ax3lk2eyml )h .7cu26olf qsp ve; :/lk 50-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-Wzaywsi 25h vzc09no.ldxz 4+x ,ma(s* 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 1.0-mf9 uf. (mkg+vgqk9e2t:fq . zzH 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 bv w2;zx)p7np 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 W of in; fib8j3. ihhqt,1s7bbskng-ductive 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 i)n9prn2;yt2*s h b r erbo;)vfor 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 indbk (dow6it, a ;usbw)8(q;i jluctor when 120 V AC at a frequency of 20 kHz is applied k swubwi(d ;(b6i8a)jtl;, oqto 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 soue4ukaj.j miyi(e az ke *9;8:krce?

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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- ;qkt fvy.2)wlmF 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 capaci+1j reiocxq3i:p: :ctz.cw8ztive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a rez(jj8cbsb) dw) +4md gactance 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 reactance8b0rhunzqd6n8;c z d(*e(0 )3xwutfkqqeo3 g of a 0.010-mF capacitor be 100 W)8oz6zuhxu30 fbcd k8t0w ( eqnqgr *;3 dqen(?

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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-m d;5gt i0cxw:bF 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 ke2tkv ev4;1mf4u a2owith 12.0 W resistance, 15.0 W inductive reactance, ae24 k4ku2t1a e;vo mfvnd 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 1 fdb3-xs5) 47 vo rt xczzlsp/6/(:ch.rh ijaa00-W resistor, 20-mH coil, and 1.0-mF capahlr xtxpz( hcz sac/v:-a/r.j 3 )f4ob6 5ds7icitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, anee r8 g :hiaq34 w+:jt7vcj2xbd 1.0-mF capacitor are connect v xbjh 7ei4crt3j2gq8:ae+w:ed 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, what is thfplnjzjncq 980z 9 ,,ke impedance at 1000 Hz,9nj npqflc 9 0j,k8zz?

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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 20nr ;yez35 nx+u 0x0iod-mH inductor, what is the phase angle at 1000 Hzn yxixr5;0 3+enou0d z?

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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 v-khgm1 3ojz4b bd0p- series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedanceohjb dp -kz3bmg -v401 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 needed in series wior .sd48l/qu;c.cw juth a 100-W resistor and 15-mH coil to get a total impedw /s; j8.r4 odculu.cqance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 5whv8pzfz4 f c*8am1ednz8s gj(-o- o450-mH inductor at 5000 Hz for a total impedance of 40000 88z1me hp(gaw5 4-v-jo*fsz8fcn odz 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 10gq i wj1gl2etx k73:a10-kW resistor at 1.0-MHz for a total impedance of 150 kW:qwejtik3a 12 1g lgx7?

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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 conne/rq 1 mwo6l2sucted in series with a 20-mF capacitor. What is the impedance alr2wq/16 s omut 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 /a ms2k4:qprq series with a 10-mF capacitor at 1.0 kHz for a totalr /s4k q2q:amp impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a i hs(dkc ie03hkpx1mq2an-/9 phase angnm-3 0p2 dkhse a1cxq /9ihi(kle 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 kHz for a hyuf+m*k 9 )obtotal impedankobh 9)+uym *fce of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz.s3nm cx k*:*ratk wo8z gu8i85 What is the phasegmz 8k r5 k*o8x*wci:3t uasn8 angle?

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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 .:drgesw s+: 9:-j7xvrzzqi k 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacr z:qg :rxz:j7 v sekw-9sd+i.itor 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 capacitor, akhz5n.33e tvh4ap es-/l znk :nd a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz pe-v3 . zk5n:l/n4t kza3hesh 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 /) eysdap 5dzl+-8buv.eex,h capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What c vbaxed)y+.-el5pd8 h e, s/zuurrent 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-W r 1 ubu.z)(-:w wczmpukesistor, a 1 (u.w1u pckmu b:)-wzz0-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase vq-2tk)qbj m) angle of m)) q-2qjkv tb$40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 2 k ugv 10hi77gv4go1gy00-mH, C = 10.0 mF. At what frequency should the circvy0 hg ug4g 7go17ikv1uit be driven in order 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 circuit withrd/:tbe u q9 +nd;jd4 3fxjpb7 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is con;rd btu:9qpfjebnj/d3 4d+7xnected 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 circuit iswkq,f2-l 2wz r $63^{\circ}$. 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 kfzfl-z(t.wpw(r : +gan impedance of 60 W and a resistance of 30 W. What is the power f +gzt(:fl.zw (r-fk wpactor?

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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 cir vh r/r(rd3/m52 6*oprtkbomkcuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor,r2md rhopr(r v5/3mo6k kt /*b when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency ofp 7td;f+013 f rcp)vcpc)kfmx5 jt)s c a 1.0-mF capacitor and a 15-mH coil in series?) f3xs0c1)t7rmt ppdff 5c +vkcj;) cp

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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 capa6/ul :: yscys b854xalobp/d xcitor for a resonant frequency of 10 kHzyox/:lss86u c4 bp/b xdal:y5?

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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 w+-e ukjlhg;)h- ,i9v x0aa dptith a 3.7-mH inductor for a resonant frequency of 1000 ) ,xv-9udehplgka+ ;a-j it0hHz?

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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 resistor an* 6qw o,5d5stpegn2ch d a 40-mH coil if the resop gne5,o56tch*w qds2nant frequency of the circuit is to be 1000 Hz?

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