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

答题人: 游客未登录  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 e5fv5k3,tpd jy)2o;w/ri 2 j u1lwuzdexcept

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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 kv)faa7z 0obccr a(88that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil x( ou5m hof :/upd(r-cproduces what kind of change on the inducec -ro5(x:f/uuo(m hdpd $emf$, 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 strengty4ka)w9x5-yc 6cscza h of the magnetic field through a loop of wire produces what kind of chang -cax 9 y4)saycz6c5wke 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 w s3 wlyt)h :mlqwlp *9vwss.1)ire produces what kind of change on the inducewwqymv.ts) l3p*s:w ls)h91ld $emf$, 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 fie+6j6z kog)vl uos)i0eld 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 conlp(2e +3a5fdgx y vspga5p- ;uductor will be that which tends to produce which of the fol+(a gep2ap3 xfg;ydv sp5lu -5lowing 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 j1 -i mos*ut fl2t1gzm ;x;w2wmagnet is held above its ceuwj ;-il;1 s mm* 1tt2z2xwgfonter with its north pole 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 flat on a horizontal table. A bar mfss(ux2( kujmb-1w u9 agnet is held above its center with its north pole pointinjkuu9m2 fs (us(w-1xb g 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 at - z0w1)tcpyp region where the magnetic field vector points straight up. The magnetic fitwp0y- pz)1 tceld vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a lev;ndq:xi7 tey: el table top in a region where the magnetic field vector points straight up. The magnetic field suddenly growsey:i7d tq:n ;x 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 horiz4fkh9sj .z*uj o7lhmi8qn) 9nontal table top in a region where the magnetic field points straight down. The magnetic fielno zj s9qmlh*. 8njikh )94uf7d disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-inc)b9vcko5o is03z/jfw9 wga1b reasing curren/oj9vof )5031k bi9gsb wcwzat northward. Two coils 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 n fr+cn7 +eg(qa+yr*raxos6v e,7va 8pole entering first. As the north pole enters the wire, the induced current will be (as ,g+n(r vq6osr e ya a7e+cva+nr*7x8fviewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about a sy)w8iklq*.ond: t/ gn axis whose direction can be varied. In a region where a uniform magnetic field point* /.lsyg8kq:) ntodwis 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 w bivficjahc86)z)c ,5ire is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform )cz6f5h iavbjicc8, ) 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.1c qx ,t5a6(ber-cqm; suph i;
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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 thak edm 2,,6dsvtt an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. Tbhpamz r2(f8x c:d 0ak+ hu42vhe $emf$ 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 direction) is moved no imfw 0k:bpu l3dci8 78-1zpsdrthward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potemps88wp-il0d1cu 3 :bk7fidzntial 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 qw ; ,rw-wo4bkangular 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 generato:xxi 8* 2iafwdr transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each p4nlkp ;4ll w,second. The frequency of the;nl ,p4l4pkw l $emf$ 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:jow8gt5 9i le 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 devicxschss j*rfd1 (s)3 u2 zu5v2ce that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the primf*) und(bg hcl,a)c 14/vax twary coil t*f)advg,/l41 ct u wahxc)(n bhen 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 mor:zir0 yh mvd91e loops than the secondary coil tv:mh0zy d9r1 ihen 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 power i 6vq--lfm 6a mbw:o90v wat;renput

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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 cik p9i-l:t ps9prcuit,

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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 connectk: nhmj, ;t4gpoec4m+ed in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltag4 :h 4n+mojp e,m;gktce 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 inducto:x* 4 nokyrd-zr are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the vo*nyok x4:z- rdltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected n 07s ::h(u bphgjyzt6)1)ygqt5 ;qommt2jokto 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 cow .ijsn/kqw ie401b+k;a2 o bonnected 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. Th pvwn5 lboa-rs3 5.2 ipotr)4fe time constant for the circuit represents thpoo-p)twn55ar4rf il3 s . vb2e 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 connepow9tk,bl * wmqb,vq-ol) +(ected in series to a battery. The battery is suddenly removed from the circuit. The time constant forle,bww+q9p) mk( t*vloqb -o, of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following hf ah9( we1md+9,x;wro0sou.7dqcor o ave the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this c7 0vpxg5ad33qvj v9h 7wm xg9ql9glr vaq 6p)7ircuit, 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 supply. I:s5+6lw62cx bsar yku n this circuit, the current :ur+csky5l6w xb26sa

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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 when th)uu:y;k ; kju/8lsi hhe frequency is hh k)8/i:;y;ujsukul 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 doublh tts -t6fq+e.2 oupb9ed, the inductive reactance of tb qf.+t9ue-6s pt2hot hat inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero,;9p nt) nqulx 307ojhb the inductive reacu 3nq07loh b x;)pjn9ttance 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 ciw vle k/h9qzqsh y;g.ud+*9(brcuit, the currenkqu g/yb+h9q l*wz ( 9v;dseh.t

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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 wm/ ls*lu.ye- 0o hxa;l.oxy5x hen the frequency is t.xol0 e-;l5ulyy .a h* xosmx/ripled?

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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 zerto3vf4- lm tv)o, the capacitive reactance of that 4)3mvfv- ltto 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 ca w )i1vu,s;crwpacitor in a ; c1wsuw),i vrRLC 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 xik)ay9;p l6*bsc5 dhx .i5,v*vt szacircuit 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. Thekf893y :-id xfum i),ffxqd ;v impedance of the circuit increases if R increases. When is thi3)ixd yxu98- fvq;kf:f df,im s 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 impeda p(c y02l/mpx38(ympu f (h:qbgyj2 +ykcbdy (nce of 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 circhz4 *6hays5jhi12l r( :yw7zj 6tyaynuit 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 LRCkq0 yd23 5tecx hhw:+f series circuit, the resonant frequency of that circuit wch+w t:d2hq y3ef k50xill

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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 applied :q:6ern0hihvcat or7/:k+p kvoltage. 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 seriesqa, u4r d( syolrhg(2*e5yzn : RLC circuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.20gjq-9f2q . cn1oz2oak T. .qjq-2koa9cg2o1z n f Find the magnetic flux through the loop when the 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**2mjxasrq klv;2x+e 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field q+2l;kr* 2jx em* xvsavector 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 unifozh .*i3xzp7yzf wvz 5ar46a5arm 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 angle457zxy5f z.hzp6 v3* aarwiz a of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable siji5fl 12mmo ,027pnk9xro 2y.bgcwd kngle 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 changu4,aovb 8y dt/z5epm+ 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 wire on a square frame with siu;lr 8(wxw4bqg 7b4ffdes 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coilf;x847u wgfb w4bqr(l. 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 wire with 15 turns and an areaj4ddzt b.yj)u:3lqf6 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 andaddzvi1d5q ) ilz-(1thmg +7q area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span o/+k omot8xna+1xwp ;qk jw(;xf 60 m flies horizontally at a location where the downward component of the E p+x;w;mx+tj(xno8k1 okq /w aarth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant angah 3k 0/bv+wqn 79naeoular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant ma3wvn/7aoan0h9k+ qb egnetic 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/u;l1 so+tje lb5c ek;l 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 n c n(9soj0p3ri*ws)i100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its arpsmo gblm :+5bg:,fz /mature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, whichb m:m ,s og:plgzf/5+b 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 wcw4um k +v1rbm)pt+zuv2+uy6 ire 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 gene.(r fl t/fxp-grator with an output of 12 V maximum when rotated at 60 Hz. A magnetic fieg./- (flrpt xfld 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 with w:uogt-t+y g3g4o (fza 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 opers +(.nsgp 9vx7cfq:drates 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 motorfpv+ w,rfyke-4 1i(bl have a resistance of 6.00 W. The motor operates on 120 V AC, andrl4- b ,f1fyipke+vw( when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal ogvz; -ypxe-nb)5miv2 a+3k wresistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the sta x;yvb- nge -+km3a52izov)pw rt-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power61 anob, /4lwyzm)elp supply. The operating current i zo ,ylm/l4)pane1bw6s 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power su21p h 4w,nheqkr;lho / al+kwzd,3,jupply. The operating current is 1.0 A at full speed., /+,,nhj3wo; udq1l eh ap4wzh kr2kl 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 needwosgj;*3a 3nl(x9rpu q w k7l4ed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the seco8 ex5agkqd 0bt*san)1 ndary. How many turns are in the )q 1gtx8a as0n*d be5ksecondary?

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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 ak x.2+2 ld9 r,itbs .yvosyl2f.ee0r r 110-V primary if the 24-V secondary v,2 yy lssf0.l.kei. t+ drbxe92 2rorhas 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 of a 500-turn primary coil and a 2000-turn sump.) z*2r csgoefd(m aa))b*econdary coil. If thez*b eg)mso*pdm. )u2f(ca)ra current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the p;c*uxjv sak9 (rimary of a transformer. Assuming 100% efficiency, ;v(xa*ksj 9cuhow many 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 transforme+s wbx6j z8 jj7+zew2lr provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primar+ j+jw2xlz 6j78wbze sy 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 300 turns on its sez + w+epnp:mu f ,fyql/g+30fd)ok rz*condary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondarfm k/zpldow+ ernyq f*:zf g 30+,u)+py?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer h5fxtp1- yl* meas 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the prty5 elxp 1-fm*imary, 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 ;p ja4sry1yjp up9yby,(hl8+ has 200 turns. If the input current at the primary is 100 A, we can expect the output current at th(4j; +pjpyl , ruy 1y9hsyb8ape 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. If 9p )9.7s-mp; .nvfqyv.u kwjskxojq(the input voltage to the primary is 100 V, we can expect the output voltage of the secondarykpumk qo.vnspj-q 97. s 9.j wv)yxf;( 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 anosa(bnetu/ii d4+d3 w /1-taud its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional loduoa t /w1ait/n+4bed- ( u3sisses)

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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 p9mm0y*1bwjsc(mgo n*s42 zzis usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number ofcz0 bmw( jyzo4n*p19gs*m m2s 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 Aa pbb0 .uann p:ddad8e2 p00rhq8cs :8 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 1.0ca 08unas 2:r:d hp.bbpe dpaq 088dn0 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 hlu tz ipy39)utr. s+3V. The voltage is usually stepped up to 4500 V by a transformer and transmitted t3+ru) uztsl 3yp.9hithrough 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 9++7 .afx pkxpgrbnkn9k /athp4ab:i 6u.o8pkm long has 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 transfor+ xipra9x4ap98 nh kofb7kan kg u6.p+:/ptb.mer 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 resistance of 0.y jt;ff64w .tt djp3/q4bsfu+ 60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is us4f3d64 t. fjpsy/+qtfw ; btujed?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power would b/58fhhvy3/ mqil1f (tuf/ htw e lost if th315lqffft/h(8imw/ hyvu / 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 me,2 ,a; qx: g/irjphkjp9eu )V at 20 A. It is to be transmitted on a line with re;ag j/h ,jepki2 q,muxr p9:)esistance 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% 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 storedqk8 gt- o47ge8s evlo/ in the coil's magnetic field?7kv8e otle4ggq/os 8-

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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 rese64fwod flk91*rk8 rl istor and an 18-H inductor. What is this circuit's time const6k4lk wfld18 fr *oer9ant?

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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 vz-b--vuc lr;+iqh,a m2p ,mh goltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the pe5,gbuf7-q-fr 1* 1rkmfuae3a ws b7 mdak 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 resistance of thg5tk+2 umsl n6e lampst5u +g6 nkl2m?

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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 )njlo,xgv e nw-)8g(g supply. What is the peak current through the r ng(oexg))j- vl,g n8wesistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. Wh po45ymw.ao7t at is the power dissi7 a4.ym5opw topated 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 rebkzsd *jxc*+fs v2/ (ysistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor e7 sjof)z d3n+a68a mx;:mvm vis $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is ru /9pbk.gba4 $I = 0.80 \sin (240 t)$. 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 1.0h 1gybj n5wuh. u1hq78-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 dujv+nfwc,g:- 47ox.cda ad.reactance of a 2.50-mH 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 8yjp skwiz( zn jxl5*)8; 6boua 14.0-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 nemtpv rx8l2 yz3q7;; accessary for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at aqlx)yxgo 6 rpnh58 o*qq8,+ 2duk vp5h frequency of 20 kHz is aqhhx,8q+dk*y xg65 oln)8vqu2 p p5ropplied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0s wfo x2yw0 8qn)k;t6t 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 ca7cmtb/gatk7v.6 f5oz pacitor 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 capyt)q7n lm4so:acitive 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 capacitocx(nf : y5ns 3auv+hah/bp96o r have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.vd v/ 8e.qb)p*n6a xyz010-mF capacitor be 100 W?ex) d6b .*yv8na v/zpq

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 H8it-ff78kuj v5t nkjt/x: 2a lz 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 circuitme6:/b;my,9ppe(5r olbgo j m with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W c ;m:r,9joy/5mg b mp( l6oeepbapacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coik67 2u. oo h8qsfv2ng mz80rlxl, and 1.0-mF capacitor are connected in sf2lr ux2 gq8o0 6n.o8kvz7mhseries?

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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 d1r 6lmzv59ympcez,(i7d1 eg a 100-W resistor, 20-mH coil, and 1.0-mF caparp e1i,el9yz 7d1m(v56cg dmz citor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH indu dco(p9ht3 58:lik kh6ikx ;yhctor, what is the impedance at 16 8tph593; hliky (dcoik khx:000 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 i 0xz+m7y+8 qk56 vuraxwoere(nductor, what is the phas8m w+ 0roz6eq75xu r(kya+x eve angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil andem /uxdu:d/ al6wl;n*pg 2xk/ 1.0-mF capacitor for a p*xeldln2ua/ ;6d:g / u/mwkx total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following cbzedg ,w fpm16 y,g()rdx:en1apacitances is needed in series with a 100-W resistor and 15-mH g en 6ezm,ddg(1w,r1x:bpf)y coil to get a 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 a 4hm4+ih k9j 9r6,cdg4j 9bsrm e50-mH inductor at 5000 Hz for a total i rmrck +b 9jh,94sjigemh 6d94mpedance 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 p 5yoadc/:,g-tls6 l; ;p9e3kruygsz yut in series with a 100-kW resistor at 1.0-MHz for a total impedance ofyyz d p5g/6oy u;alt-,; r gsk:lc39se 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 seriesa +lqgiu n;oomns 4ly6w+3+s2 , +wihq with a 20-mF capacitor. What is the impedance at 1000 Hwon,n4amus2+ is wl iql+;ygh+oq3 6+z?

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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 wita;t-; glow8s clxz 5,pi:o 0+ cdgmwg:h a 10-mF capacitor at 1.0 kHz for a total : wl csao:io;x5;pg0w8cg z,d mgl -t+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 capac/q fui)f kohhj)s2s3 (itor at 1.0 kHz for a phase an2 k)fs3qihjhf (s)uo/ gle 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 yo6zmb d/.)od a total impedance ofm.o/ dz)oby 6d 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 a leop:n+e4v e3t 120 Hz. What is the phase 3n4eelo+evp :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 5.0 V and 1500 Hz if a 100-Wom;iysdp -.:csw- +c a resistor, 20-mH coil, and 1.0-mF capacitor are connected in serie-d c;-p+i:sayswom.c s?

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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 resil.*iildfv1dusg;5e zy, 87 bsstor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rm yu7bvlg8 s.sif ei5ld,d1 z*;s 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 Wisbsj 94*juss1p h x/+, a 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 current flow h*41bsu 9sj+ sxijsp/s 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 fghvgt x :m:ol;3b f-/mor a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conne:gfmbx :o-v3lthmg ;/cted 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 witq) s* ,qk juwlr96iu5ch a 500-W resistor for a phase angle of ks*ruuq,l6i)5 cjqw9$40^{\circ}$ 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, lu vbmq7 9m vo i ,;+.e-omp.it67gpitL = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order t77imiv lom9-pt .u;b+g v,tqe p.m i6oo 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 with 12.0 W res+j4 oxz6ufnk f8k8s f4w3m6x xistance, 15.0 W inductive reactance, and 10.0 W capacitive reactan84ffoxk wzkf8uxx+6 3 4s m6njce, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of answdatf3 h;q.4 AC 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 impedance of 60 W and a resistance of 30 kxyh +:ocg 6v0x4t sa.8j2gmeW. What is the power factoac+ y 0s2 o4vx:8xe6 gtmgjkh.r?

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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 y*rr7; j 2a uowq-)(l zdlu5qn50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when ) (uo5wjqrln*ld7 zq 2;y-ar uconnected 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 an84rem 0m;)te3pj-:mcsxa oq wd a 15-mH coil in series? 3qo: rtm8m0sm4 j;ae-c wp)xe

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is n3-/rxu++0oafy7trp er be a;s eeded in series with a 4.7-mF capacitor for a resonant frequency opux7 r0s/ oab f3aet; rr-e+y+f 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 need-ig 8gnp 8)cw lwj*3jved in series with a 3.7-mH inductor for a resonant frequency o p -8ggiw 38*jnwjlcv)f 1000 Hz?

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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 8j yf:lznq5 /yseries with a 30-W resistor and a 40-mH coil if ty5:q8lzn j/fyhe resonant frequency of the circuit is to be 1000 Hz?

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