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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: 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 except9:y xb4xx )lgl wm zkm,h)lq..

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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 2 z ltve;*4x-t0nl( :cnnajvzstates that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of nd6xi p999na5k e5qsp wire in a coil produces what kind of change on the i xnd6p5 9p9in9se5qak nduced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop ohhe;es0s v():q;9ets6vqp v vf wire produces what kind of change on th;:hss)pqv hvt9 0e6;vq(e vsee 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 what27xowca:;jff( a,( egd:o hft kind of change on the induced(df:7o xo ;:ht w(jf,a2 cgfea $emf$, 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 fielqtg ku-4ni ;dple9 vr:l+/9 jy:ie;nc d 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, t i,4iz8juwf o1he direction of an induced current in a conductor will be that which tends to produce which of the followwi4 uzo, jif81ing 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 onqu) zfwa216m s a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (sa)w6mz2f 1quwhen 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.bf7nd 9wm4z 21l ae)mgbd7(cf A bar magnet is held above its center with its no47m9mddaz7fw(g l1 2be)b c nfrth 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 )-wlg-a3g sxl.iqns1i3 iq x0gnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil ag0ln i-q-x 1as.3) iilsqgxw 3s 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 reg lt6:ej uoaew9bt:.q3 ion where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increase: qe9:eu6.attboj3l w s?

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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 region whereglrz /r a:7 0w84 psocz9bfat7nqe0k, the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of th0kzctaga48 e9n :z wrbl/7,pfs0r7o q e 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 lieshddp-ri5)d +7yktz l 2 on a horizontal table and carries an ever-increasing current northward. Two coils of wirtz-ri)khdd+y527 p lde 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 lomex:v *3yralo d0rop:p:jm, .op of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from ,r0erl: * xjam3mvopdoy:.:p 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 angulak e-emy *(s mse+0;h;, zcutlmr speed about an axis whose direction can be varied. In a region (eme ylhs+;,-m tse z *mu0kc;where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angul3p u(q9bkdw g3ar speed about an axis whose directionu(dk3q9pwgb 3 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. 6laa *s gtbs/o grb/qa+7s+6e
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that a4qd n0.vx u17 w3))wdz9mf tfr8yfj aqht58jgn $emf$ 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. T mt(x)r)zrk4 mnl c3mc0 0 8,gnysqnk;he $emf$ 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 directiowl) / t bkriguhr*x,4;n) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced acro,wt;r ilkhrg*x/u 4)b ss 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 anguknvkr4do ech+f 6 (ee nw1c(a:6/d5molar 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 transformwt3d 06f(d u pc03n ib8a; pkmw(7wfjvs

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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 revolutionsd3yy :0cab )+1ygii vf.5crxk each second. The frequency of th:x 1kyrfgd. +i 05icyvb cy3)ae $emf$ 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 devipvl6 x1;7(3vej,i yr9ls-iqr au lld+ce 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 thav 9z8dqonp;5m(k mojc)wp0. l1e *paat

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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 mb 4a11jzbh)sj ore loops than the primary coil thza)11b hjjs 4ben 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 t06 zxkwcm.*ny ma*f4 more loops than the secondary coil then im4nwa*6 m ykc *z0f.txt 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 powerx ob9,v ue.l+u 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 circuit 9 xi k/tk)/:s2xjiiqq,

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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 io8:+zzmalcu2xsj e;9 deal battery of constant terminal voltagez 9+o :zu;2mls8eacj x. At the moment contact 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 serie2zdb,sj-l :0teye id(s to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the ie ,-jsdd(itl:ze2b y0nductor 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 connecte3s ev unllm,45a q)h5cd to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is conn ut0 v9/e y/;i+qm0ci cvf.fvfected 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. The time coaezlehs 0. d- c,c4sw+,ji0pn nstant for the circuit represena0,ch., zse d+ 4p0enisl-wcj ts the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The batt mgb/.jpf sq;k1xz31cery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for thq1 f/.bzcp kg; js31xme 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 t:;etgyqt2 r /* usadc,he 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 circuit, thepou .71nj*xurod- )p7:hhuus9mv p d. 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 in.wc (cak(y5kp6n7bAC power supply. In this circuit, the currentkcn( y k67a.cpi(nwb5

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactancr:jsltic ,btd/o4k;5 e in an ac circuit changes by what factor when the frequency is t45bk:ri jct,t; o dl/sripled?

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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 awt xuij(4fz r1e: j9jgow 8j0f54(hxj cross an inductor is doubled, the inductive reacti(04ewrgjjwjt(h1 4z9off x ux5j8j: ance 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 AC voltage across an induc6:an2xwsp3 +--7s khnq tvlj x- 1gsbitor approaches zero, the inductive reacta3 bias-x-wkp+ h7n6gs-:jt1nvl2qsx nce 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 powerp(gl;a:j2 rc- :skzwo supply. In this circuit, the currentzj; -2lckwp (grsoa ::

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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 changesfog- d :yv0.4tto/mr q by what factor when the frequenc/4q0.v oyto-fd t:mrgy 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 capacitor approachecxi-*kv,ec; u f./agjz4/ra f s zero, the capacitive reactance of that cg,a*cc4zv.x/kef-a ijr/;u f apacitor

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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 capacitor in a fc ,* 2ynks mi00ghqtx,yd, 2pR2,*yfhygq p,,cts 0i0mkd xn2 LC 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 def 8kl8fcy5e i (/-laduq9m n8lfined 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 circ exmujsm *gg7)mc) 7 w,ued61qbd .3ojuit. The impedance of the circuit increases if R increases. When is this statemeed*mm 3qe.xu,jg uc1 m)bj7d)7gw so 6nt true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuu*n mc5:t)jlwzt- s.kit 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 ifjh)fzty* 8;wn $X_C$ 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 avj)xp2r9l5h :k *:cp+m/:o0 ( nfzwb mybjjo vn LRC series circuit, the resonant frequency of that ci(j 5: 0mmj rzhcop92:jbby:+nv/oxkf l vp*)wrcuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltan-m4w qkm,jocwi ;:m0 ge. 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*t 7gwh64r y*hxl an4b 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 z7r/hsns c1t/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 thn 1zr7/s/c sloop 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 9w *n/ahw 7gia0.20 T. Find the magnetic flux through the loop when the plane of the loop and the7wwnia ahg9/ * magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rofb6vaf,tuaxhnt, m ov74 n-4, tating in a uniform magnetic field of 0.20 T. Find the magnetic f4a v67tvf fo-tn,bhmx,a4nu, lux 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 adjustable single loop is reduced from - b / teuyh4/1rw1fdkr8xuxq0 $1.0 \; m^{2}$ 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 change*ww5n0avqww k- h -1est *1fuq1wjwf 1s 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 p53kjseef *2nl:y7z0hvc 7hys xjn03 on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular yc:7hljf *5kn3 nys2sv0zp0e 3xj7h e 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 wire with 15z* .jt9vx n0hefq)5f t 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 apd./; myrcpj gw9 rp42f7wg s yfra,46nd 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 of 60 m flies horizontally at 2 aishw1t4g:0a gte x6a location where the downward cogt tg14hwa6iax :0e2smponent 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 r (4.xcw-joll;x t p m(lt1qm-aotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constanto .x--at;w4pm(jxqmt(l1 llc 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 of 1rrdsj xr:/6k $0.25 \; m^{2}$. 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 turns of wir ;lvv1.jv cik n4(gw.ie 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 -20ckmz/ o ay:nj(iojis 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 rotation, what will be the maximum ouozakn- o0:c/y(ijm2j tput 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 of aru8t0 5u q)sed hbon9c.ea $0.090 \; m^{2}$ 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 mop)b9l-- fm7erflq(cq lb0(generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available-mf fbq7 )pec9lr-((o0lqblm . 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 wb9 ,s6uggopbw 8fo6sd6f m7,lith 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 DC8w64jd*1(xl qfe : eqb(-boxmbw3 x rz motor have a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor (utwx6jr yf-y:ow+c, have a resistance of 6.00 W. The motor operates on 120 V , w+ryy(uj:6tfxw c-oAC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a uh qz0fx32mx .uo8d1bsvj; +xv3;qvx24-V power supply. The operating current is 1.0 A. What i.xxo+2 3dqh um1x vsb8;3q; zxjvfvu0s 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 W is connected t -7,b nlvo -)icl1e7uktdppv*o a 24-V power supply. The operating curbdvu 1)- k iop,*c-l7tevln7 prent 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 6.0xgszm2,j tm)xg9ia(9 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed)g ti9(g9xzmmjs x2 a,. 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 tzm.6ii(if1 x - zri,gis needed 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 o61:b)oe*lkv qud f zl+8pgc 5mf a transformer causes 14 A to flow in the secondary. How many turns are in the second)bkvlfoz ud8mq 5l*cgp6:e+1 ary?

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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 i*7d 8zbhlm 15abiq d,yh84bx xf the 24-V seconb8 q*b ah15i,dz8xld4x mhb7ydary has 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 50uj.hl9wrp;;4uq9 ca ; :eeo6b ilsim:0-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is;rpaw ilolsee jbc;: mi.h 496q9;u :u 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 primar i7p7z(bdc 8r.zltic4 y of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondac8z.il4dp( z7bi rtc7 ry?

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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 mA. Tnh( cr4h.hi3hhe primary coi (rn3c hh.hih4l 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 300 turns y0nzuuxw0n5b 7i cx*dy /*fk* on its secondary coil. If 120 V at 2.ncyk0 xydwf*7/ibuuz5nx0 **0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its secol3 n5xc87lsvl ndary coil. If 120 V at 2.0 A is ap5v lx c8ls7n3lplied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns.6p-jh npr 1 5l8v8cqpj If the input current at the primary is 100 A, we can expect the output current at the sp68qjjhcnl-v 8ppr5 1 econdary 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 transformet06k lnz vqmt3z.v+;ar has 100 turns and its secondary has 200 turns. If the input voltage to the pri0k.3 zaqn+ t lvm;tz6vmary 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 transyf8bp 6*dh;-77 uswunh v+ ewsformer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglectpufs es8 dw;7wyhu v-+6h*b7ning frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltagekeys yt.5,2 gy 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 second syty,k.ge52 yary 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 curreneg6 jls/wi/ 5nt at 120 V. The voltage is usually stepped up to 4500 V by 6/jglw es /i5na transformer 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 current at 120 V. Thhdm ,,b9q7 pshe voltage is usually stepped up to 4500 V by a transformer a,h9qbsphd m7, nd 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 Wp/*m5 qoi azb.wc-u;twvyn 79. A generator produces 100 V at 70 A. In order to reduce energy loss due tw o7p9ymcqtv ;*abzi/.w -5n uo 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 has a tg+nj9ka o jldn-x, 48potal 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 of the original energy is lost when t 48n-kpx+ jdg9no,laj he 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 p(m;ijo 4 9pn1ob0z,(yart jrpower would be lost if y;pj tmarb(j1rpi0 o 4on z(9,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 88grj v5z34l(quvf cztransmitted on a line with resistance of 0.60 W. To what voltage must the generator outpu8zr3( u 85vjqvgfl z4ct 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-s im6h,fdt pi;w *v;a current of 5.0 A. How much energy is stored in the coil's magnetic field?*m hf,tw-dis6iv; p ;a

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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 6.0bd;4+r*w bm .j xsccm2-W resistor and an 18-H inductor. What is this circuit's.2r;ccwsbjd 4 + m*mxb 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 rmd0 wcffki0 *p5kyp0 c4s voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-w ciof /*/ f0jitmth30V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 12 4; l(xowkjoa6q b7z4t0-V AC outlet. What is the resistance of the lampo ;wxokb4z4( 7l6a tqj?

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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 po7uvla/ys2v+8 x4 to nfwer supply. What is the peak currenfxa 8v /n2l4ts+ouvy7 t through the 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 5n2a3ye cem+efoj,*li lu-6 kpower supply. What is the power diss6elu+i* j,lyke eanmc of-352ipated 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 73gl. m (qwiux6rm 2*nicfpq/ d4wec/a 50-W resistor 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 50v)na-im mnv;sh3 e6)-ug tq1 g-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 resistor isq, lafh+fn;9d $I = 0.80 \sin (240 t)$. 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 e768bsswee n9 of a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductivb qltms1n4x852,0ohawmvot2 e 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 a 14.0-mH coil have 14.0m1 qenia/pa7 ((nl(t e 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 ned.ygw3 2rgnkuqp ;70n0. xfrwcessary 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 ec8i(f2w 0pxhje4/ola frequency of 20 kHz is4/pcowj h i8lf2(ex e0 applied 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 pgfkj) ,mr9u* ,y2cvi-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 capacitiv(jx:z,chkwmxit1 5p t h pvl+4,tsc 5-e reactance of 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 i3oqsxc1 s-n. 0n:aoewy+ki; ts 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 does als qjle1,0 :m+tn :wqu 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 a 0.010-mF capacitor be .dj))*y tth hew41poh100 W? t.)*1whojh hytd)pe4

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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 throug1- ci,uf3nobv5 lf7vfh a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W *mj-rddp ;jott3 oinoj2(k;,resistance, 15.0 W inductive reactance, and 10.0 W ca t-(pj 2 n;3jm,jodrkti d*oo;pacitive 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 coil, arxwvyti. s*i526b ) o r7yn*sand 1.0-mF capacitor ao* t2nwx sy6r 5is)v7.a*yirb re 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 i 3g.qr y0;ace)tw 6cexq5 tjc1dgx3 5af a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in sc60 e;qtrx3 3ey5xwc)jdq1 ggaat5.c eries?

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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 a8qk(8r igddc/ 20-mH inductor, what is the igdiqk (dc8r8/ mpedance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with+q7rjao9sl - 6vcdeq.bu b(n4 a 20-mH inductor, what is the phase angle at 10as76b9e j( nu.l-r +v4bqqdo c00 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 and 1.0-m81hnv3:dv t ugF capacitor for a total impedance of 100 W at 1500g:vdt u13 nvh8 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 wym:)lq4 2,eu l;*d7w *d ci .aeernyniith a 100-W resistor and 15-mH coi* 4nel2e,dywuqiny. ;i7eam c*rd l:)l 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 450-mH inductor at 5000 a3/ ui+ asys594yl.wpd8n ar qHz for a total iqw l. 45aa+nu38y/ prysiasd9mpedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put indq,til *rc9-r series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kW?9dr,q*i-rl tc

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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)o:x gu3xi7+ c9nhjbx is the impeda3ugo:+7xx9cx hjin) bnce at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitonxuc+ha3taz ;z chkemy b -lej4-11 87r at 1.0 kHz for a total1k+ 4-3e7utan 8 lzc ej-hcb;hmx1 zya 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 caphugpwatk1,el: d29/- 7b ldcbacitor at 1.0 kHz for a phase anglw,htu9lb/d7gp:b2-dac1ek l e 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 t8r nq1jsws3 k/otal impedance of 45 W?qsnk8/ wr3s1j

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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 capacitojt - .gbjfijr; 6o;8 4tcoi.nrm5t1x rr at 120 Hz. What is the phase angle8;ting.i j6mo.rorr -jb;4t1 5j t cxf?

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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 10vvl+3c c r 3wnte.upr40,x9 lr0-W resistor, 20-mH coil, and 1.0-.c rp3x4l 93eu 0ctlr n,rwv+vmF 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 capacitor, and a,-xnoi*h mgh /h. )-)hsqc2xr*kqqugh o0i h* 0.350-H inductor. The circuit is connected to a -o n*hhuxh2rq-.h/q) io h,s ig cg *)mhkq0*x120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and ab*xe r6hsx2 t5n inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What currenst2 xe6 r*xbh5t 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 circuijs bv5 6aqtnz,whjva 2(6-k f j.rt,6it containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inducsarj,5aq n. jki( vfzbt, 6-v6ht26jwtor, 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 ur* 43t.uk1 0y-/srpeledt oyangle of e ko/0*1rtuer3p l-4 yusdyt .$40^{\circ}$ 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 = 200-mH, C = 10.0 mF. At what frequep er3a(3 ;+ wsics3,4d1kd+fa a ahbhency should the circuit be driven in order to have maximum power tran+w hi1+a s ae;4rf sekap3ahcdb(33d,sferred 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 Wzsfh+ x,e qs (;jz botx8k8mw/ j2b5d1 resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?xm/ojk8b j2szfex,w z1;tq hd( 58+bs

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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 cj8botb s4 4j29teyisw-t v. /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 Wd( fm5., euvjm. What is the power facto dmf.juve(m ,5r?

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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 resistor, a z/o0;wvy bvzzg4 +o8b10-mF capacitor, and a 0 /v+4 z v;o0bzbyogz8w.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 1.0ksad o00.d5 gn+uucm 1-mF capacitor and a 15-mH coil in series?cou0 ad .+ k50ndgmus1

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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 ah-2 3c (/kcslyxc4ftc 4.7-mF capacitor for a resonant frequency of 10 c/fcc4h2 tc( sx3ylk- 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 segeb;mca 5 p8rpx0tq9/(ok t5 sries with a 3.7-mH inductor for a resonant frequen k505xsg ;ma(qc8t9bo/ prtepcy of 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 e3 w v6wx.8 u/gr;l*vcekc1 bwplaced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to .k 3vwx /vcr*uewgbe8;wl 16cbe 1000 Hz?

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