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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 magnetq)t* d;w-)k3opkvizuiiq ; n-ic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction statesenyd1w, ys3*,fpr. c l 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 wire in a coil produces what kind of 7v(p mc;;qxqj tga4l 6change on the induc;g p6a;7tv(qjc m 4qxled $emf$, 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 magnetic1,lbppmwo v:-m:e:jz field through a loop of wire produces what kind of change on the induclj-1bm,: :p:p evwoz med $emf$, 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 a2 ep 2 2x3x:veef4kskr loop of wire produces what kind of change on the induckp:2e fvx2ek2x r3 4esed $emf$, 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 f3bo3f*pmh +09uc n2qrk/xqq *43j )wfla gowurom 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 current in a q7 tujgcm,x( zfh7 .,pconductor will be that which tends to produce which of the follow,f 77,tzxp.uhmgq c(jing 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, ; jh,5mhu4hujnpg1 mrtm k11. A bar magnet is held above its center with its nornhm 51,1j khjp4,1 thmmu;gruth 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 magnet : qm5unchoxe;oh x6z /e)xg4;is held above its centeuh/cq; on45xexh omg6; )ze :xr with its north 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 magnetic field vector poinb,5eul oz7bgq67:1wyj6k d dits straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the:jdldb7i56,z6uk7e1 q yobg w field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where thepr y a* rnof,6b*6++vbj6vvn hg,h9jj 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 f6yhb* jjb vrj nnv,*a9gv +66rh po+,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 magnetic fie0nsq(w a4 3pzqld points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced cur3p4z( saq0wnq rent 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 /pu prx/fj6k9 lies on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced k 9 p/f6pj/xrucurrent 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 norow efg+rke 3lu .0:dc3th pole entering first. As the north pole enters the wire, the induced current edkr cw:+3 go3fe0.luwill 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 angular speed about an axismtcm15h+yn 4lh; x4kf whose direction can be varied. In a region where a uniform magnetic field p41 tmkmhcn hfl;y4+x5 oints 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 wifeyt k*3:e,mpj(lk6c a umo 66re is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the looy olt*pfjm6,ue6ma 63(kkc e:p'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.i(9mu7dg f1 u4 by6 cka6x5hyf
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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 tha( vpn.z dhvr*uvo*4lb5-lle( t 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. The 8fjj;r baqv o0 2n99no$emf$ 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 (orz)xkq-82u 83c h jinzviented in the east-west direction) is moved northward at constant velocity through a magnetic field that points straightkjzzhquvc)3i288n- x down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant anhw ro6,6cziq 1gular 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 transform6f36esdxkllze * e*kno( :vj(s

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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 qolnu m d*r.2o+zn9 2e8rz; ruthrough 60 revolutions each second. The frequency of thzur9eldr q u2. *mn8nrz;2o o+e $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device usefl r9iz q e:i1:npqy87vj5s2g4ti 5rjd 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 devic:-. 3jzhfu:f-zkc.+rv1kf - xlzkzcle 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 c-tn r f,ub ay)c5onhqm25p5j4d tg (m8ontains more loops than the primary coil then it is a5tr4)gc n-,tu dm5b28y(mqjfanpoh5

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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 cont0j idxd f;oh8i59tb.p ains more loops than the secondary coil then it is aj8 ixd;dfi 5h 0.ot9pb

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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 po. 2qkm1 s c,o5ndru,xwnouj/ ,vb.m7mwer 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 circuwq ./pynv363 h r8mgheit,

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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 ar:y7 ol.:dc yqje connected in series to an ideal battery of constant terminal voltage. At the moment contact is madc7yq ojd.yl::e with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal bat*g- 0owy,qawiwyiljy;:q i)-tery of constant terminal voltage. At the moment contact is made with the battery, the voltage across thiq*y)y ; -l0:a,ioj-g ww iqwye 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 htxm7 )fa4im,z uv0l .tte z/+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 Luec9 8qanw*sf nb/j1, 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 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 coa 0 p )l.g(efvxs3++rf z5koxjnnected in series to a battery. The time constant for the circuit represent+rpsff 0z5(x ) x3o jl.e+vgkas 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 tg.n14avrx u z10j:zzf;5vffto a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the cuz 1ta4: g rz.u; 1nv05ffxvfjzrrent to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units except:x9. rzuy 2)h -n;e 1)g si4zslqd1llga96sdim

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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 supplknczm14b ol2/y. 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 t t1 ggcbna-wpx,+hb(34v *j oao an AC power supply. In this circuit, the currenn(p-ag13th,x jwa*g obvc +4bt

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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.ipg. /srz og; factor when the frequency is trg..p/og; i zsripled?

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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 +0pj + n0uut8*llqswalk 1j-gan inductor is doubled, the inductive reactance of that indugknj*lj 8l s10uqpt+ +l 0-wauctor

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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 acrok cw1 -ea,1 mi-seuu/z2i uc1lss an inductor approaches zero, the inductive reactance i1ca-u z/,1mies1wu -2ckuleof that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, the l *yrzamruz22x5l/tw/ks.sh-r 4 :mw currel :xkrwt*.wmm24h r5 zys2-su/zl/rant

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactws 1n( nh; vrbh1,)aqdlybv 1.ance in an ac circuit changes by what factor when the frequency is tdv1;,hb qby1lwvhas n r)(1.n 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 zero, the cd 23z;x7s xiocj 2n,kuapacitive 7sc2, d x2ikjozun;3xreactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and jb/2h d5nr8p tcapacitor in a RLC series circ5h dbrj n8p/2tuit?

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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 askpo go n2 1ld,ian(u 4w1.e:np $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increaseslq9/kc t -p*hm if R increases. When is thiq9-tcl*p /hm ks statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increa k y9( g/y2mr;h*m+lxgc2jmac ses 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 seriesv;1 xv*rh g2go circuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance h2ciewhr;c :de1p 75:4lrowlboth double in an LRC series circuit, the resonant frequcw reo1wc hi:p:d 7hlr42e5;l ency 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 voltage. At resonlgrlnv(6 ;j f:ance,

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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 R6tia o 4n;duttzdb;-1rcn a/8LC 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 m o siz6e o. j3 95uile/6geuafjztdy0o)l0o 73agnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vectorjjud09zo5 te s3i/e )uoaz 06 i3.o6ley lgo7f 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 r7vnfuve-jp /n . j;s9yotating in a uniform magnetic field of 0.20 T. Find the magnetnu pf.7/svj ; ev-ynj9ic 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 mdafz /qn4c p2,f7sbi :-) ij tv-qxqk/ is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux q:in xb,42z ajvfq -pi//-sd)q7 ftckthrough 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 anwe0qv m5k9ej, adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a co/o 8car ci. 5+kvz9ohthd0mm6 il 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 cm. 6 pzkn(e6/od s A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average6p/snkzoe( d6 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 withs rx0i0e,q i46 uuxi4g* f8yqw 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and a/(:oc70mlu :p*jej 6qbxasl 8r y1jeo rea $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing .pj0fz5esq9 ,0xl st)l pab4fzm,.a q span of 60 m flies horizontally at a location where the downward copsbleqlap., zjq .as9mx 5ztf,f0 04 )mponent 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 rotates at a constant ants /ti k/zb03z e pw8,ku1*/r2gkthhngular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic ,nhz/8/rpk/z 0eb k1 w thukitg3t*2sfield 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-sectionalh +yv tawj13g,m14y/r snkn1 t 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 10ss: 3fm*f 05u :7bxjfgt ouc6g0 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 atlkdm. qr)0amc o)a; 7rmature. 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, which is perpendicular to the axis of rotation, what will be the maximum oumdmlc)rt qo)7aak;0.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 ub gac*:cg 0o7of 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 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 generato:uc2 5jb5vs ve1 c3amxr with an output of 12 V maximum when rotated at 60 H51b2xa:csjuv35ce v mz. A magnetic field 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 genea+dnd v pe xg;3)x(a oneh7n*5rator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motw:bm2djl9jb0 or 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 6.0n)na39v-kik+ycwr t:5b9ozj0 W. The motor operates on 120 V995oc+ vz)nrtnb3 yjk a:wi-k AC, 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 internaw/9w lqg:f(wcu+shzo*p :: mtbkz+w 0l resistance 6.0 W is connected to a 24-V power supply. The operating current icw :l+s9qbwhg */(kf:zp:o tuzmw 0w +s 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 connecte 2n:g /bfgt(xpd to a 24-V power supply. The operbfn/p (gx:2gtating 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.rfve6:wpub g q;1:bo)0 W is connected to a 24-V power supply. The operatb:u ep)6r1;wqv: gf boing current is 1.0 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 primary5r;g3 xdbc8 ur 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 cz-6.pxj10hpzi q.v-3m et mbv auses 14 A to flow in the secondary. How many turns are in the zq1.-bxh ve6jvpit-z 0mpm3 .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 man b :jlz ;yp/5s s1mzdxj;idbb(ny8 :)ry turns are necessary in a 110-V primary if the 24-V secondary has 100 turnizjlsbybbz8)p :x j /y1dd:s;5;nm (rs?

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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 coic 2.h,gk7 mq;v.adz 1 i5gydhcl and a 2000-turn secondary coil. Ic..g;y ,5v mg12z 7iddhk qchaf the 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 primary of a transformer. Assuming 100% efficie( 48s)yrilo1ano+ykbs ;.nm ency, how many amps at 24 V can flow in the sei4 syoolea.b)1kmy(n rs+n; 8condary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil owj;dr*: el tr:y-t-oh f a neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What dlr- yrjtowh ; -d:t:e*oes 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 6jteno*), ga. e)e og:hl8(hfky-p*sw0 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 voltage is present in tg ge :l)oe )at-,nh*(.wyokfj8esh*p he 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 ntq2 0:agp+ey 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 current is present ieg:y ant2q 0p+n 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 transsh:qi yfv(0zde-j8e bx1 h,4 eformer has 100 turns and its secondary has 200 turns. If the inputbedvz4,-x fs( 0j yei8q:eh 1h current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its as-.c5 uq .uo8ke2upfwzm8; nsecondary has 200 turns. If the input voltage to the primary;u5-upkw saunqc8feo.m 2z8. is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 tuee/cj qs9zxv2: h fo1-rns and its secondary has 200 turns. If ts1 c /vh -fojezxq9:e2he power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually sti1f(b lf5t er+epped up to 4500 V by a transformer and transmitted through a poweif(e1fb rt +l5r line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepped+)ffl+ yejt fjz 0v:8e up to 450+ yz+jf:j8e)0f vfe tl0 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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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 voltage is usualliwo4cx2x hdr , +*l5ojy stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.xxo* ldc,r4ij2w+5 o h0 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 l gdw--+cc spje0l0,m,z*jwqyine 50 km 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 heatw,j c-+-ljg0*wy, dsp 0czeqming 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 total resistance of 0.60 W. A generazp03h1r1 a itdqi qr72d8o*dc r:mlv 0tor produces 100 V atmq100hd a d3qdptr*ci 8vr:ir712ozl 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 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 10 9hcnm 4bmaf11jg((km00 V. How much less power would be lost if the power were transmitted gm nh(1b1 afmj4 kc9(mat 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 be7s0o l pils+e6-osu/a transmitted on a line with resistance of 0.60 W. To what voltage muspi6-7u s ola+s/e l0ost 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. cr16 )hibbp9* vtvmw7 How much energy is stored in the coil's magnetr)cv9t p*bwiv7 hm61b ic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contn,xl7 mnp9bgyu/i: ,tains a 6.0-W resistor and an 18-H inductor. What is thi pbug xm,i7,:yt/ nnl9s circuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 1 j,nm/l+ny3,ogc :d ,oafp)vc20 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 iq) su;)ukohzx.)t6f is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is :/g ctua sbk,ynvi1) 3: ir6spthe resistance of the lamp/yb sur1vt c:kgn6i s3,p):a i?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. Whs0( )0 fi,locs; hi,,im9zueoy3c kevat is the peak current through thvo cf; i(hssyi,0 c0 o,lm ze,ie39u)ke 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 connew y-5j*+ t-.mx9 kmdtv6szevrcted to a 120-V ac power supply. What is the power dissipatym t6w *+vd-zvm.9ksj exr t5-ed 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 resistorejtg ho7 (pv/ gxdya-xi*4;2y 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 resisto jk3l.ov2:dy ub16g ons5h *ngr 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 is .u x2c i(9phzbqh9liw5:(z l t$I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH induct cqyd08h2:wu qor 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 coiag 5bf-w7 hh7il 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 oto.5d0 1; ft/si0af yml lu5,dpe ior7f inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 Ww0rx 5h1jqqd , 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 frequency of 6kjm-) lw1qono6jf*c20 kHz is applied to itjoo cl)n m kw-q6*6f1j?

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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 2.0 *-r blsksak;50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-m a2l,rmqq v9(q,yxp n7p;l ui woo3aob48,o p:F 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 i2 )0jwck;xa 9:g eee*vfzhv5qs 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 a 10-mF capacitor have a reactance ofsep8se g1v:blx3 22ra 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)3y8d pi8z.vny*w u fe-mF capacitor be 100 W*i38)vneuy dpyz .8fw?

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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 caqtk ( 1k(ldk5upacitor 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 resistance, 15.0 W8 s f5)/2y6y ubeu*ka7od cxrt inductive reactance, and 10.0 W capacitive r7o/rta6u5y dc) ky2usbef *8xeactance?

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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 15t,em5 1 o,o( a2ureuyh00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected ie5o(y,utuea,m 2r 1hon 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,a*nh 5a9ik-hxx lx4y 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series95y,a4ha nxx *xil kh-?

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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 2r(d l0 uos2vw nid3n0:0-mH inductor, what is the imped s30du(n iw0lvnod:r2 ance 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 a 20-mH inducto4axka h xr a8 c4db;e+,-ff rh53q5ixir, what is the phase angle at 1000 aax54cr-hx38bhik ef ;f+x,a5dqri 4 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 wid,.1xu;9qu nx ogcmfr:3sdn-th a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W atm-urx :1dds9;o gcn3fuq, nx. 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 n mei7ee2 .ei6a+y4an zeeded in series with a 100-W resistor and 15-mH coil to get a totain 67e z+ieaeem 42ya.l 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 Hz for a 8 d7hxl-+5uyg pxfyz+r 0o(nbtotal impedance of +ozb5rxd+nlx gu8fy(yp7 -0 h40000 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 foksx.,v*; ht)hn x2vdt t6r ,por a total im 6ron.tt xxh* ), d,psh;t2vkvpedance 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 series with a 20-mF capacitor. What i2vz1m 6xbxj7bp rt+ objur+50s the impedancetobpjrv501+j+ m2 rz7 ubbxx6 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 capacitor at 1.0 kHznzp eir2n 6wz4v-hnoobbo- - fx(c)96 for a total impedance of 45 xife o nz)(4v-6hw 6ob2 pb c9r-n-nzoW?

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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 wib))ytd bh*)w+c0 bucmth a 10-mF capacitor at 1.0 kHz for a phase andwbcb+ h0 t*y))) umcbgle 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 r,ias*36mr tb iesistor at 1.0 kHz for a total impedance of 45 Wi iba,m 3s6*tr?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 1204 wtmq2sace6y 7xy+f 0 Hz. What is the phase angle 02sxf etcy 76mayqw+4?

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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)2hyqht.-bj(:m ebsl 6 0mjzw-mH coil, and 1.0-mF capacitor are connected in sezjq-s:yehw) mtmjb 6bl.(h02ries?

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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-m9-lr*g0uk xd4td8xwb 76 uyacF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz po7uxgdl6xt 90-w *yuakrd48 cbwer 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 ca 4js: hx7*cz yfxz.e+opacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power f :.zy4sjx+ c*ozexh7source. 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 containinn)a 3awwxb 4v4g a 50-W resistor, a 10-mF vwb w4an43x)a capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phasejf r 098a/u 0 kgbfi*a1xhhkj; angle ojffi08u/g k0r;a *khah 1bx9 jf $40^{\circ}$ 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 fg xy6e7 ,:vlwerequency should the circuit be dri7,x: gylv6ewe ven 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 cir*;ntv 8 rdyw*n5 9u1q(ailhcocuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit ih 5*n(lrv9 dou1*c8waq;yntis 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 ACxp-ksu)f b6.f 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 m+ft fp./8/e9xm hewja resistance of 30 W. What is the power f + /t8/pwe9h.xj fmmfeactor?

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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 5srt694,zawadgr y+ m2ynqk5 :0-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when+as6z: twrarqk y4 gdn5,29my 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 pu*yx7 q76 izh ku*t9zq6 -zqrof a 1.0-mF capacitor and a 15-mH coil in series?r76q 6zzi*- 7qux* zk hy9qutp

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for a r x tob)4-ijam8/jw1hhesonant frequency ob14 him/wjax-)ot8 jhf 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-ss( wor -)qc+je ,8cnjybnm++ mH inductor for a resonant frequency of 100e+ noj +y(cqsn8+,jbm-r ) csw0 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 series wit,a n 5nib isuhu3yjgkc1f2d.6 b 0:k/xh a 30-W resistor and a 40-mH coil if the resonant frequency /2nuxs5kkc.h6ni bu gb:3j,f0ai d1y of the circuit is to be 1000 Hz?

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