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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 flux exceptlg*ry zls7 :u)y+q 6w3nzr2bv

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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 th5q:t8jq5kvyv3w mj x9at the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in tqsk3 r79 qkw/a coil produces what kind of change on the inducedq7 sqr9k/t3 wk $emf$, 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 magne,h9065bweve kc :s yqftic field through a loop of wire produces what kind of cc5 shf:90 qe,ybwk6e vhange 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,o2hmap o)op78 o flk- of a loop of wire produces what kind of change on the inducaoo8 7pm-f,oho2)k lp ed $emf$, 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 - s8u+uhmb*uo 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 aalrz.g5 o;. wcurrent in a conductor will b a lgaow;zr5..e that which 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 t ves :x4wq4:+f;izhmvb) .mchorizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when vi4vi z;4t c:mh +q:xm)e.fv bwsewed 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 he;wxnrs 5cl-61o2see/ s)lrm orizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet l/e2x5ws)e;ls-o1c rsern m6induces (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 magne g fmh awb 3+mg.7hhwqj+r-78wtic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current fhgm+qw wh7 r. gh37-jm8ba+win 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 vecto g9gnw go rgs0(q0acq.8p;bl;r points straight up. The magnetic field suddenly grows stronger. When viewed from abo0;q rg g.c8qglgas(90;o pw nbve, 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 iz )tqmcy+hjyv 5 ,w-k*n a region 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 coilm+yz5,-ctj kh *w) vyq 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-increp:rt4vkqo,dbwa0y0 zz7,z f 6 asing current northward. Two co vzb:tz 7d0of,y qa wzp,4k06rils 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 pole e c7gcpgoaf)zx;.-+sv ntering first. As the north pole enters the wire, the i- ;c+p xvcoggz f7.as)nduced 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 rotatel1yb,p es3ka*/ f*9hwkm hk4 nd at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orient,sk pm1bn / ke4*lh93fh*ywak ation 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 sp3hxnn1 m/imy51o o hx+eed about an axis whose doni xo 35ym+xhn/1m 1hirection can 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 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.hl o6c/p)g7v;-jf 1swi )yhjl
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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 thans 0nk3 h ymy/ /xb,f4vpht-)ot 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 fielo9qey2t v y3ks:s 5-6fl+ eredd. 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 directio ;he ay) 4voxdzl4n95in) is moved northward at constant velocity through a magnetic field that points straight down. Mhxd ;nvz5)44al9 ioyeake 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 arsi c 5hf(cl4,:t9id 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 xl;a hgx6u.;rtransforms

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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 reva .f lls,0cmk vvqujl4( k)(x5 c.aqd)olutions each second. The frequency of th sakx(). kvfl.vm(,ldlc0ju)5 cq4qa 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 dts euy).,r4tt evice 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 thatzv*,hp did0 bi+la 2o/

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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 sea -: xt4:yuzdjcondary coil contains more loops than the primary coil thend4u:-ta:x yz j 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 cvzlns9+f*2k 6 b9mr8:hifznd oil contains more loops than the secondary coil dbn29*v6hn rzi+zl 9:fm8fskthen it 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 powzj 0)j.7cqxdr 8bwoq,er input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant ci8- th4hbae+j ox,wf: +lbys/arcuit,

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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 tdtmy*y ,(a4yj o 4 6-igx-qzpbo an ideal battery of constant terminal voltage. At the moment zyb-6*-(jg, 4q tayyod 4i mxpcontact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an j 9j* oaqf(:okue(a qj-vv:8rideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductor ::(qja j 8a(fv ejork-*oq9vuis

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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 resistance R ismm (+) cerc)6 c+zjpws 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 andztj ql8k/ -xzm wp,9g8 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 inductotd*p/r6 ib br9by h98or are connected in series to a battery. The time constant for the circuir9 i 8*thprbob 9yd6b/t 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 b,-ofx)tb1a yd+pso / wattery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time ap, of -y tsdwo+)1b/xrequired 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 excg6rwipss41 dj zfpa-rl 9;(+rept:

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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 p 0 kd scxd+o+as8k0:7x py(gtjower 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 supp (* jjbiiwfn6m-r4zg4 ly. In this circuit, the currentgbj(z m if n4ji4w*r6-

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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 faca4l rpq/,- 4/ae0mawgjgl -qjtor when the frequency is tripledp-a/4ljma /qwjela, g0rg4 q-?

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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 av rf9.q8nvy gvs g*-)ycross an inductor is doubled, the inductive rfnv . vgvyq sry*)-9g8eactance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC4 2 dzmr9o-dbhrv* yf8 voltage across an inductor approaches zero, the inductive reactby48 rrfd zm-ho9d2*vance 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 circuit, the. pv, jtci1*8k2-ekaok7e nj v curre2.7-cvk jvpnaj,e e 1 *okk8tint

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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*qtzomd2 c+gr/ ;,j w ,kevy8 4j0s2bux*erwjs by what factor when the frequencyerv,42r xbogw2e+j uq ck*sd,0 jmjzt ;wy/8 * is 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 capacutg 9,7a qss7pitor approaches zero, the capacitive reactasua9tgs 7,q7p nce 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 voltage kq a:h5-vw;:ld1k(hlcj;t ua s of the inductor and capacitor in a RLCd 1-jc a;hlawtk:kv;:l (qh5u 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 is defin8-aw3 ciovdcox2 ;9daed 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: j1 hhkasyyc/7 q2uj20e*i,2pq zuiu if R increases. When issy,0z /iu7qycj*u2pq2h2 : ki ua1eh j this statement 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 1l5aq q 85bryrof the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increases if tp*, owcqr8wth 8w-x8 $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit, th )+ei 7u1f4l2uld bqcqe reson 4q1edb ufi)cll7+u2 qant 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 i xre2 s(a,cg)ljq,o9 ys driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series qxkb2y3 t 4t)/ lcz0brRLC 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 magneticerqqod hhl(k9g l 2u)h360 wd. field of 0.20 T. Find the magnetic flux through the loop when the(kwh e62 l )hoqq03glhr ud9.d plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating i0mdh,vqe-e 53 s 4vbh/2njkoz:i, dstn a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpen/d3:h th2em-5,noqkbi ejv0,zv s sd4dicular.

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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 uni14ebgn)g)/la t/qrj c3zy4aj form 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 azcj4brqg/ y))a 3ea /4nl g1tjn 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 :v9xujo9 ynle0s86df.ppbk2f. pv; y area of an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changeqbf r/sm5. dn np26p-es from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wir7w2 jbh8,6xk iatdph )lv2k9ye on a square frame with sides 18 cm. A u7hbp9,t6dh w ai2k)l8j2 kxy vniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wirum)n2qyi f pgzq0;x:.b 4i 5iqe with 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 zm xh zf9rq h8ro8pg-kv .9f63g.n/k larea $0.20 \; m^{2}$ 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 w ot4g-f.j4 otbr656 y;b thmmving span of 60 m flies horizontally at a location where the dog;jh m.ttoo6 5y4-6 4tfbrmvbwnward 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 rowoitmi) .w; r4wdh murf8;e7+tates at a constant angular velocity of 2.f;4i;emo+ dhr wwmrt.87u)wi0 rad/s about a vertical axis through 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 croisqe b1q5ho k3-b1hb2ss-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of( hd1u)ll1qz,l gqi/s 100 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 hhicjbj9r k8lg 3c/*s s7xy +580 rectangular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long si7ci * / hk9hb 3ly8scr5gj+jsxde. 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 //k zjefuu.0jl eu) 4pof 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 j7x sj5*rhval ag/8de(y 7ke7 of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotatingkxeejr*dh7as8a7 (y7 5j v/ gl coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximum u* so uvl;:91; fsjbaty(v9 rg$emf$ 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. T,*ji 3 *s4/izso o kl*75nd8kxpjoij y)t y6kmhe motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates on.ig voidm6b y4:g5c (r 120 V AC, and when running at .i4c:(6gdmyo 5vir bgfull 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 conn5p/ cm /a(atkqected to a 24-V power supply. The operatica(k paq/m5/tng current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 m c8 bw)j3/ontW is connected to a 24-V power supply. The operating currc/)njowb8 3mt ent 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 ctmt1,qvp.(mp0in mm +9wj.ws onnected to a 24-V power supply. The operating current is 1.0 A at fullv.pt1mwm+,i0j msw9(q tn pm . 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 voltagi tuepv6q+sasi)0 0hqbm ,w47e 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 trdp*qai gj 57yb*r/2br ansformer causes 14 A to flow in the secondary. How many turns ar* *a5 qry/dp7ri bgbj2e 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 necessarydqb+cl3,g)w tv mvi*5 in a 110-V primary if the 24-V secondary has 10,3 di c5)blqgm *wtv+v0 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 covxa)7f /ois5s*oa jwst:- 2dmil and a 2000-turn secondary coil. If the current in the secondary is 3.o*vof w jdas5ms/2t a 7)x:is-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 pglj71 ,su.k(morg ; sbrimary of a transformer. Assuming 100% efficiency, how mamsg s71ru;o,kl.j(bg ny amps at 24 V can flow 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 transformer provides 750k q dcgjisa(995 + ;vfmv-o4tv0 V at 10.0 mA. The primary coil operates on 120 V. What + v45-; sftkd9jv(c qgamiv9o 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 jlh0. 9r/ w-tpu:7bfw gqd,a p/e,pjz o xt;5icoil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to trta9w op7f- hjpl0u;i5gwd,j/e ,bq x.t:zp/ he 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 pmilms8 9z:zoc 1t+p7lifl7d /rimary coil and 300 turns on its seconda1/pdi :c l8zlom zs7tl7m+f i9ry coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns av. angtjb7zaokw( (j53 lv:2 und its secondary has 200 turns. If th 2bo:(75jwt3(. zjvng uvlaake input current 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 transu uplook5 cu.b1 -yrc9:1 fq+tformer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, w5ct uo1oy-l.c1 qu k9br:fu p+e can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its se 0sbd- 2fvufu nya1*(u(tt0pfvf v(ymd / )1plcondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglectvy)pd *( l0 n1(2d-/y tffvb(t0fpuufmsavu1ing 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 curreeb arp,f/6s a*whvnp.3) vn )ant at 120 V. The voltage is usually stepped up to 4500 V by a transfv/,pnw a rab)nesaf6*) vph3.ormer 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 current at 120 V. yxj:8hsf4sglz: *a9k The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistancexg la 9z:s8*k :4jyfsh 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltagl)*ig1 0o;cn ml canz5e 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 lo*0nl o;a ccz1nm 5gil)st 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 enab: kh1 c48jzsu 52ya 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 transforza24nj bs :yec185khumer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistanc i5l ,yyqq)6ch n6;lh1vv- kjy5;wvl de 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 percenta)q1cyn ;y l,vy55wilq;6hldh vk-6jvge 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 /x c7a3cqu w7rr umaa 52ij.4xat 1000 V. How much less power would be lost5a.uq4circ7xa7 rmx a/2 wuj3 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 generator is 440 V at 20 A. It is to be tran:z .o rqzlum*o tv8bc-a6,t j7smitted 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 transmission is not to exceed 0.010% ltrz,-a7c jv.:*mtou6zq b8o 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 curpbv5 7;iks15-xcf cbog;,mj hql w2xv5 i w:f3rent of 5.0 A. How much energy is stored in the coil's magxc ;5 ligm vq2 1ff x svwjk5wbc:bi73,p-ho;5netic 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/72ds,bscq.co qm 0e tor and an 18-H inductor. What is this circuit's time cocc 7e0 oqtbds2q/ms.,nstant?

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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 120du rovsi g2 iog/a7v*9* alu*5*ahr q; 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 d ;ub9715z iirtr:tk 8,ff nxdAC 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 resistancerew,;xzv4zn - of the lawen z x-z;v4r,mp?

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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. What is tcd4e woz94* tmhe peak current through the rest4mzce* d4o9w istor?

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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;ciohh/ 3 v38hyul-h b 120-V ac power supply. What is the power dissiivu8hohyh3/l; b3h -cpated 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 w 9cfr39gxyps93q 4zlresistor 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 ()su 9o.t/h b/e0uh fkkele o+e1)lc r,zi1rt50-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 resistoeg.gk+q7;gdr r 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-m 6uj4fsk6ov*en9uqq b.+)lg hH 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 mj 5qu5i dtky4x(2 fz3coil 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-mH9;t0uo0iidv f ybi/9 c 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 agck2yefb urhx926jau p/s2* t ; :7csht 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 v)x7p8 -,,h mel zses*tw:xan120 V AC at a frequency of 20 kHz is applied to it,h) vlese7wxazxs*: n8pm,- t?

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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 tprlejw.mi*(9:s +oilm: v ps+hrough 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 o 3nk* aqb8rl)2/qvpu mm 00okdf a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor ia e 5jx 1s f1yg9vh*qd. 36zv*wzo: i,d*zztcds needed to have 50 W of capacitive 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 doeu*:ak 11u:8km2jf:kdlow0mgn rp -e ts a 10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of ajt.,r5gix g:rug7-y 6wlb9 mt 0.010-mF capacitor be 100 Wtj5-w , iur6xgg .tbrmyg: 79l?

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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 th)bh*g1h t1un ;b9uksmrough 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 wi,c6uy/mkn2nsk yya 3hi(0 lq9th 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive nlq3cush, ny (a2 /9yy6kkm0 ireactance?

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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, 20p- oqx ;ylhyl9b,2p m.,j tbe3-mH coil, and 1.0-mF capacitor are connected iby-23b9jp qlyeol ,hpxm ,.;tn 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 s(ve* ,uvec2 ka8iw4o, 20-mH coil, and 1.0-mF capacitor are connected invae u,2 k*s c(8e4vwoi 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 insq8l yfv1n +/wn/ 4fef5d9m srductor, what is the impedance atr fdey 41v m/5+ ql/9sn8wsffn 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 thn5l 1oyp7k,ec1q j3ht e ph lp5koj3h 1q,ncyet17ase angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-;co /zfm vmhm2 i38mw1mH coil and 1.0-mF capacitor for a total impemf /3w;o vm8i mz21mchdance 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 isqa9 :9u 2;b hl6dc a9m laze,ysg0f;ge needed in series with a 100-W resistor and 15-mH coil to get m 9ed;lh9;lu2gaybagcsq 96, eazf:0a 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 ; )wg qc8,c/r8swqg ouput in series with a 450-mH inductor at 5000 Hz for a total impedance of 40000 oscwuwg/,;q8qrc)8 g 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-MHn-x9tv *h-xxqub0jd43 qo*daz for a total impedance ofnd-j*bo9d ax4 3vt0-x quhxq* 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What,,sksnh+ h uu,x lha9ech,s7* is the impedance at 1000ecx,snh +l uhs9h* uh7,sk, ,a 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 sf,(o wysae5wg(x, c8ns7 x -3tzp 7zz1.0 kHz for a total impedanc p3t-,s,sw xns7 ax7c (z(zwyzfo5g8 ee 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 ke0o+ fje7m ivz 2/- pmjtv3tj)Hz for a phase ango0j jmtz v2me vp7)3/te-+fji le 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 f3ky9ej9 7h:thk p e0itotal impedance k0h9ei9j73 kpeht y:fof 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is o3+kfgk1 pp4s the phase angle 3pspo 14gk+fk?

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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 i7c px)2rgiv8 f jak4,of a 100-W resistor, 20-mH coil, and 1.0-m ) oifk,agvj27r pc48xF capacitor 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 capacitobmy dvi5-gc250sl q, nr, and a 0.350-H inductornsib5 -dc, 20q5vmygl. The circuit is connected 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 g9 wgvh(z5ja +capacitor of capacitive reactance 30 W, and an inductor of inductive zg +(vawj59gh reactance 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 series Rgk+x+2qj ol 1kLC circuit containing a 50-W resistor, a 10-mF c1 j+kkql2 go+xapacitor, 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 frs*c52ny ut 377enk5 kifxu v4or a phase angle offcvusx7 nt7 rkni*eu5 k32y5 4 $40^{\circ}$ 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 = 2ae:om);)o b*ps nv; dt00-mH, C = 10.0 mF. At what frequency should the circuit be drb)on;tem*sp:v ;) ad oiven 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 circuitgqi0e a:2i,9-mq sbg n with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, whea: b092iesnggi-,mqqn 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 circuitqk+xabl 59,qew)7nc oj-y :al-d5f yt is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. Wha :lgtrin:u:6+y9u xs4j7c el xt is then ix c:su7+9 j l:ylr64utxeg: power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W rqlv +o18ae5xva p9bexo/ 3h0i esistor, a 10-mF capacitor, and a v ilb+h /e5o3q09ep8xxva 1oa 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor acfdh*: mgkys2 u x5z4 panc e80py6m./nd a 15-mH coil in series?. ym8fs /pdkg6pcx52y4:a0 me zuc h*n

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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 f 7qyzb+p(m( vcapacitor for a resonant frequency zbm7fv(yqp + (of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3ithmr *):ps 4f.7-mH inductor for a resonant frequency of 1000 Ht)f rsp4:*ihm 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 beg3i*nzz(ly y5j p:l(c placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be(gy i :ycnljz35 zpl*( 1000 Hz?

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