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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 u9zpfq6eod-2v 9 wd jl*3ykna9nits of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induct;ji lb;x+ ojk;ion states 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 wirbtgz 3 iau y7.lh3p 0kfv-hb+5e in a coil produces what kind of change on t p7u 3 y.g-v3thbz5iaf+k0hblhe induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field throug(by5or / :g:acy(tweph a loop of wire produces what kind of change on the inducey:ywrgc(e(tpob5: /a d $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of ch0sreze 5 lp(/sange on the induceds(e0 pr /eslz5 $emf$, 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 frolpid )-1k(ehuzu5 b2gm a magnetic 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 ci q * 1kj7cctr1ioeolil*; *:current in a conductor will be that which tends to produce w qo7ekt1l1 : **j; rcccoii*ilhich of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magn2koaxud;pe2(vugg5v- 4df q )et is held above its center with its north pole pointing down. The stationary magnet ia2dp k -xu2gv5uo()4v; ef dgqnduces (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 magnet ibcx:fob j)t+y u(m+4ws held above its center with its north pole pointing down, and released. As it approaches the coil, the fallmyju+ctx+4 b:w()bf oing 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 th,9m/fut 8xdz able top in a region where the magnetic field vector points straight uptdf9muz/h, 8x. The magnetic field 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 level tk yq8pae/;df7 able top in a region where the magnetic field vector points straight 8pq af;ke /d7yup. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetiilj, 8kczf ; - n8bk3c cfmyq8+dn:d8sc field points straight down. The magnetic field disappeacy;nsczk :ind8d-f+ f 8l,j38k q8m bcrs 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 horen5ryn:v t*l:8t*ed0pf5n gm izontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. Wh :ng *ednep8v 0mtryl55n *t:fen 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 l*ruun/gt (it/ oop of wire with the north pole entering first. As the north pole enters the wiru/tut/gi r(n *e, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant ank2avtg c8 z-a7gular speed about an axis whose direction can be varied. In a region where a uniform magnetic fielg kavaz2tc8 -7d points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axd2h;ibvlt 90( orpsq zj9+h:uis whose direction can be varied. In a region where a9u v qs (p2d:iz+hb0j ;ot9lrh 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.vn0hux . al 4/8n:cvgx
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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 q3f im d*vg4l-8 a npp-v*/,r,my zylkan $emf$ 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 toz p6en e;e3/ m3nd0aa magnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward s qp ux2;/nyi6.uqr8.p sf+zgat constant velocity through a magnetic field that points straight downq.s xg+ p.s8;in yz/r2u6pq uf. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constantgogf9;sg. fftkm 3o6pt9(c3 z 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 transfj(oqd bm.f13( 0l ikf,g;oxt porms

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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 second. 5mc5hek eaw a,cs7ex5qc.),p oe uy/6The frequency of theckeeacq)y cs65a7m ueo , pw,/5.h5ex $emf$ 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 usedmur td /y;s0z6 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 devirlk(nakj3rd.js/9 2a3yy 1 q ice 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 thanrw kjk- -e24ky*g(7 pgabs7ez the primary coil then itj7(ekg 72yea-bkr -*g4 kzsp w is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loop+c3x qpc3urbl/2 0fmns than the secondary coil then iqm n+p bf3c3 lrx2u/c0t 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 powk:ai; itl/lao rptu +)lq,, .ter 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 resonant93mkk.q ()s s a dnv4cmdlqd69 circuit,

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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 ae/wb7hv n.x,f *m*lru(18mc fmskk3er 90aeare connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across t,e*ch3mflr7/0r* k kebs.8me aauwv9m (xn1 fhe 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 ideal bal c/k;so- asy. ea+t+x;zwcw/ttery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the indtwcc xy ks+-/;;w/ szel.o+aauctor 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 iz;j ; xp+7crx0 .shdyanductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L andfr kgmj)/.; gln:qh6j* 8z sxrna1 l7s 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 inductor are connected-seh , edq3.rr in series to a battery. The time constant for the circuit represents the time required fo,dqre.3 rhe-sr 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 s1uk:0myp3r: qqbg.+du/) b tln -joeaeries to a battery. The battery is suddenmn0 lobp 3 er1/gu:) +auj-qqk.byd:t ly removed from the circuit. The time constant for 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 hag1*i n,h8i wqrve 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 toks 6 nvj7 3zvdz01+enj-h1u hg an AC power 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 supply. In thi*+ db03u/ rip23bl7pudxwlu ms circuit, the currenu2xuwl33birp7 b *d +mlu/ d0pt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in5tdzh8i3lfj ( an ac circuit changes by what factor when the frequency is triple8zf d jh35til(d?

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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 ieur:a)4 fpq-hjs6, ci s doubled, the inductive reacufh 6)cq4,- ajre:s pitance 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 voltazebd5 l p/d wqtv*y;kqp4, 6-gge across an inductor approaches zero, the inductive reactan5pg, -lw/ dk4 6bz;vdtpeyqq*ce 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 pow g:ev7b 70c n(wxd2ugoer supply. In this circuit, the curren : ex0odw2u7gbvgcn7( 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 y ;m)8ilx5kg gan ac circuit changes by what factor when the frequency is ) 8kgmgyx5il ;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 n b81seahhz)y)u3r,m across a capacitor approaches zero, the capacitive reactance of )zney h mha)3,1s8ubrthat 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 ind: k*f.d/ gknpd+1f n3s +joihructor and capacitor in a RLC series circuit?dn/*k +ok1: irdg +s.fjfhp3n

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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 defined k .cy- xh*dn0)m+/tgod ( qeujas $\cos M = R/Z$, 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 circuitmzy)52vnfxie( o2t 7k increases if R increases. )e 5nx moi2vy(7zk2tfWhen is 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 impedanc70*7g mdmhzts8,jcrz n8w,k 9c /mp dpe 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 circuit increases ne.snqwn1o*.; y3vb p if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit, the b5v fav4 :1j)onehsl8resonant fre el vsav8):h nbfo1j54quency 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 is driven by an AC applied v eglw axk)4mr5xt ,z5:oltage. 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 l 8tblrz6w( 4mwhen

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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 rotatinha)nxk+) jbp,g in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane o+) pj xah),bnkf 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 in a uniform magnetic field of 0.20y3 zvmb0cco, : vm3 cz0boy,c:T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.20ekr2xg5bq 6j 7 T. Find the magnetic flux through the loop when the plane of the loop and the magnet5q 6jrgeb2 k7xic 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 singlp t:heqzh.cld oi 0k0 6w2:./obk ur*ve 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 cocuyh md/ vp)7 /kgij46m ig ml.m)d9i:iin .i4il changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cq* kjuie4tg/sgs: q;,m. A uniform magnetic field is applied4sgqukgq:e*/;jt ,is 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 wire with 13 gh(p8p:2affw u :n1hnp q2ed5 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 af v shs;jro )o8z)s5 k4it;di-nd 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 sd71 j; j e-g-(kws-1kq dijwuepan of 60 m flies horizontally at a location where the downward component of the Earth's m-skj71 weud- 1;-jw dkieq(g jagnetic 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 rotatt+2ih(1 tni zfes at a constant angular velocity of 2.0 rad/s about a vertical axis thnz+tit 2hi1(f rough one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-seeqcsz8 4 +sdar/h,: qsctional 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 consi(av( cf9 dd osvv;4h/rsts of 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 80 rectangular loops on its armature. Each l e2 hgptmd(gx*d/vz. .oop 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 rotadmpg2dxg . zv( ./the*tes 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 of ae4q c ja2z;s(m;jy3 eo+ku 0xxrea $0.090 \; m^{2}$ 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 constrbzzxo: c 0qg:j+in -.vuct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is z zq0.g-xcj:nv:o+ ib$100 \; cm^{2}$, 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;zl btb/ z5go0 a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor h6 vnf uddy0o1,/od1t 37svsr 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 have a resistance of 6.00 W. The motor wmuzm7 zlcw2e k ov;fu55/-d9operates on 120 V AC, and when running mofku-5m/uzvwld 52ec7 9;w zat 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 24-V power suppl5pqyt+g k+vs9y. Thkyg+5+t 9psvq e operating 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 W is connected:tlcg+tkh*yc6 3dsf+ to a 24-V power supply. The operatin t+f :kt3ch6yg+ld s*cg current 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 connected to a 24-V power su/8w* 5h (wktuv-q:u1dkss jpdpply. The operating current is 1.0pdwuq(v*su k : -hdk/t j1s85w A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primanvv/ 1n utxzc 3anj4*-ry 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 prima,w (yjw erg3wcammgou5g9: 7 :ry of a transformer causes 14 A to flow in the secondary 3g,7c:j o5w yuw(:g9rwgme am. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the 24-V kh 1 qfq.1e3*tist4ly secondar314.qkq1slyh et fti*y 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 consist ;lb,zmbho; f9 :r:* ynthxgk9s of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the curren:f ;*zbo,g yt;9xnl :9k mhbrht 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 primary suylv5 ;o0*c* x i9jicof a transformer. Assuming 100% efficiency, how many amps at 24 V can flyjcc0i lo*x;9s*5i uvow 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 transfd8 )b2p8i6f6a qq m7zhl9a bboormer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary drawqazahmo2i6qfl 9 b6d8bpb8) 7?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer hak * -r :wiv8 ,etcxz-ij(mn0y0rmuks( s 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what vox :- j- sc0(v iu8z*mkwm,itk0rre(nyltage 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 semw:8z+l5fe 5j eoin1 dcondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in 5:e olz1 fe +5wdmjin8the 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 turnside7rl xoi*o8 jzt(-- p:db6v. If the input current at the primary is 100 A, we can exo br:dj8d*vpixitl-- zoe( 67 pect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 zd6hx)mks0n3 7mzn 7h/xpiy9turns. If the input voltage to the primary is 100 V, we ca9sn6xmm)pxzdih3 7n7/hzk0 yn 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 tran1xh;f gvedb/ ;sformer 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 (neglecting frictional lossesef; v/x1 bh;dg)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is 4lr-mv3 +nd amusually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the3al-ndvm r+4m 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. s4b7f iw3p8u.q 7rac c The voltage is usually stepped up to 4500 V by a tcfuiwq748s3 7 c.barpransformer 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. The voltob(nkxf;f o /:-vclo: n/q(ryage is usually stepped up to 4500 V by a transformer and transmitted thncb o-/(r;:n/o qv(f l:okxyfrough 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*izc5(9n nsgs q avpd50bx/+i *9hjss 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 would be lost if the transformer were 5d gbj 09qsv+(/z9cphnss * x5n*iiasnot 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 0.60 W. A ge (as:99*nvqt4 ;okoxq icz4kznerator 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(499z cqoav ;n4*zk so:qxitk 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*jzqj)xr jn* 2mua a(+ down a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 1000m u2j*jja+rzq*)a( nx 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 transmitted ojv+uo zom*p qxo 3x3vuy;07*x n a line with reom*x vzv+u33ou y0;7 jox*xq psistance 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 s9lgxcj 11vp+ yi/xy m5r)y-ois stored in the coil's magmx/51l +jyg c- vor)sypi9y1x netic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. W:.mhpiz .ms .-eu4wdghat is this circuit's timig.4zwsu.mme dh: -. pe constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage yr5tn9ye+ ++vu b o-3ng p(-agqii.fwis 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. 2y5)ia ly ;jflc*a( ac 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 n hsim/fosua.,1q q*2AC outlet. What is the resistance of the lam1q.* fao,/2s squmnh ip?

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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 connect(ovcujew:,k). 7e j/bh bkp y7ed to a 120-V ac power supply. What is the peak current through the (/:,)cbuweybe7k hpo .j7vj kresistor?

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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 twtkl nb:c)fo34c s;9ro a 120-V ac power supply. What is the power dissipated in cn b93r)t4l;:csfow k 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 resistor is j lw-lm obe f4am+2k77 e26o4(vgvimq$I = 0.80 \sin (240 t)$. 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 c;9mpduisz4h98 agt (zgn9d, 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 is4v(8lzh ef0l*kxp fr4 $I = 0.80 \sin (240 t)$. 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 reactance3yv6kf p4njwlz z(cu 9d0qvty0qbt; 11,dtc 1 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 inductive reactance of a 2.50-mH czptflz0rv)2.t i,w t47e,tyy oil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W.;gqui ip+2uo unk -m9 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 1u7e pxev3n,kf/2 t((twzjnrr8j9v ,j57 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 a frgi)2gl en, /t4v7zpo c(fkbn;- kka4jequency of 20 kHz is applied tonk 4v-7k, bz/lpjgg ano2;te kifc4() 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.po;n f9 9*g algli:2 *wnyyr2xvx1z-k50-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 of a 4.7-mF cag +;l-+f xi2gctzmv 8/1 ivscypacitor 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 tmj,womz2e hy7b bh)/ *o 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 a 10-mF capacitoq9 jntmr2. 4hzr 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 0.010-6:1cx aksx* zhmF capacitor be 100 W?x1c: x 6khz*sa

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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 aukd 7 xh*9: o4orfxfi;t 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 wiq.ig hbrd9 d0ad/9swmg0po+a d5 ei 65th 12.0 W resistance, 15.0 W inductive reactance, eiphrmw0d/ i9ds0ga95g 6d5 bo dq+.a and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, au0f xujtd7uh 0e2p:xaker-r0x-6xe 0 nd 1.0-mF capaci-ter x06e apx20 r0kxx0du:u h-ue7jf tor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W re65)cl9pgj qjx0+4wkt svle6pwo; z (bsistor, 20-mH coil, and 1.0-mF capacitjwk 4zt v 6ejpq(pc9+l x0w;5s)og6lbor 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 conjbkiw ofl+nppd(x23.wm e221 nected in series with a 20-mH inductor, what is the impedance at 1000 Hz.wbdeiw2n2 jm xfo(32 plpk+1?

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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 fjddpcj 48-7 ainductor, what is the pcpd7d -ja48fjhase 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 cirw .e4 7mz:pldbcuit with a 20-mH coil and 1.0-mF capacitor for a total impepb me74d:z.wldance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W r:oua*z3)mxo,eha- e2qg 3z mpesistor and 15-mH coil to get a total impedah: go*ea3p ,mze uqm3z -)oxa2nce 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 Hz bu 6,9.htywy wiue40g for a total impedance of 40000ywy.49g, ubi0 6etuwh 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-MHz for f9(dp) glc* zg rhim:1cb02d8c8trym a total igr dir8clzm h)1*gtbf 9m02(cd8c:py mpedance of 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 sqi:97.bys85zafv 6-tn daa dseries with a 20-mF capacitor. What is the impedance ab az s:qd57 8n.fdait9sa6y- vt 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.6 w3f/i2y9s2ml orgv i0 kHz for a totaflmvswgo3 2r6iy /i29 l 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 : i uxcbo-09ex3buim9 in series with a 10-mF capacitor at 1.0 kHz for a phase ang3b:x0oiuiu 9xbm-c9 ele 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 nty0s toos,(t :eeded in series with a 30-W resistor at 1.0 kHz for a total impedance of 45 Wt:o t0o(yst s,?

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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 serierocpmsj0-5to(q.l m ) s with a 100-mF capacitor at 120 Hz. What is the phase ang- o) l0.mc(mtoqpr5 jsle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0 *rr*g-as7tve 9s 9 eo w1sk*1ioj7blj-mF ca ov*sk s97-br* 1g9t1e rj7*ilasjeo wpacitor 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 i/a q2ff9 bpmw )bl96ncapacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the b 9/f6 la29nbm fwp)qicircuit?

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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)ep+rtv zjwm f6q68gmp(h(y3 of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connectedwmjpztqvm+66g(3 )pyrh 8fe ( 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 RLC circuit contain+y/l8 j)qze bcing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inducqb yl/8j)z ec+tor, 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 nece/t mo d9 czz4h/5f:uujssary in series with a 500-W resistor for a phase angle oftuc5mdu 9zhz//:4 ojf $40^{\circ}$ 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 = 10.0meyq8)dl2c0oziu ; b ( mF. At what frequency should the circuit be drive)ez0;(bdo8ilqy 2um c n in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 1p/)69uvi jxm+/ ,pm1 ww(mchxvur d a(5.0 W inductive rea9w vri m(xd)x1c/phmuv (/+6u apw,mjctance, and 10.0 W capacitive reactance, 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 an A flga7eq3,n4(i ko+scC 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 resistxh)qt nk1vq8/+ bszj 3ance of 30 W. What is the po+ z1x 8hj)tvbq q3/sknwer 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 Ruz/:uw2zys :vzl ;0*ejs(a uo LC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H indz(:ujvu/zl ao;:swyes0* u z2 uctor, 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 and a 15-mH cb4 iq4 nb; pv6oupl9p:oil in series? 9p 4iu6bp;nv lq4po:b

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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 mp(v8 66ycssmvogs 6 ,x, brf6in series with a 4.7-mF capacitor for a resonant frequency of sr66 ,m(b vx s6y,psmc6gvo 8f10 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 3.7-mH inductor for a reso,kst))l md9a.j2s x yonant frequency of 1000 H) .ts olskyjd ),x92maz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and4kagyb) u+5r9ek6jalb10 3bc v o5fpd a 40-mH coil ifja145arb cb9o03+levfu5d6y pkg) kb the resonant frequency of the circuit is to be 1000 Hz?

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