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

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic fl,a5kp 3xz44f rccnuo4ux 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 ind2(qzz7*y lr b-hzf 4;wxko**rxj 8xxpuction 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 wire in a coil pr n8nnhm22.mmo.bi nz,* lu(c/w off y)oduces what kind of change on th.zlyo,m *2ff2c.i )u/onnw h m8nnb(me 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 through a loop of wire prsvh35m67o.bnmvma qm z7) ch:oduces what kind n7 3 z.a6)bmvmsmv5cq h: om7hof change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a +einex(,5r c ;rz xc2ploop of wire produces what kind of change on the induc;r( eeix xc+p z2,cnr5ed $emf$, 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 magneticki d,* 4gr5tru9z iss xd+9:aa 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 direc yerx+t3u tgf.+.4xyytion of an induced current in a conductor will be that which tends to produce which of the follo t3x.4ytfu+gyrxy . e+wing 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 hvp -.e9yhpg*g5ih od1 o:ivz+ orizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet yi1hv h*gdo.gov:pe z p-95 +iinduces (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 5rr:ueiv30.cz 5qm(da rgwv )magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (whenwg mrd aezv(v035qu . r)5c:ir 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 fieldvs6*21s ymn v)bpew/e vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the indes 2)yswb 61em/nv pv*uced 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 table top in a reglcymb2b cskr(4:6l(cion where the magnetic field vector points straight up. The magnetic fiel 6(lcybc(c2s r4l:kmbd 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 axmhj+ g, n+xoh*2gb: p horizontal table top in a region where the magnetic field p g xgobh+x,+*m pjn:2hoints straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increa,i(i4ojgv* yu sing current northward. Two coils of yjgio vu4*i(, wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loo,1 tss5sx 1uhaz*x9ty p of wire with the north pole entering first. As the north pole enters the wire, the induced current w1x,tx9hyut5s*s1 z saill 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 / d .hq9uwiv+zat 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 loop's axis oq9 vh u+w./dizf 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 axiv pm1hp bccxs3 qp382gg5v+.o s whose direction can be varied. In a region where a uniform magnetic field points straight down, wha v gmp+px3ocvsp8c 2.hgb 3q51t 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.1 r;l /5/bjs dh6jo :rtlexfn3
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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 :n9:juu.q tlc we;bc1an $emf$ 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. eb)bw6bs6wj5 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 thkh77j1 bq. ;tpzdcv ylu :2*mpe east-west direction) is moved northward at constant velocutdy7v1p:.bmhc ; pk*q2jzl7 ity through a magnetic field that points straight 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 angular velocity bmdkdb+ k(-bu )th.(z$\omega$ 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 generatoln-8z b +d i:3dbsc7 rrr*q*blr transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revoluti5gkxvh1r*d.a*n*)rb e;uzplons each second. The frequency of th* k5.v1p*r; b r*hxdnulz )gaee $emf$ 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 de.b ib:abb wx1hf51i/rr g:b u*vice 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 dr pb*-pdesy-3 r v(*glevice 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 coib/.dacnf2+:s1acy yg-xs9 w kl contains more loops than the primary coil then it fg 9c+bn-dky21.sasx /:yca wis 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 prim* isgqnv) */jyof9id 3ary coil contains more loops than the secondary coil thf nv/ii9q 3** gdyo)sjen it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power t+ .cn)l)cdgz 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 resona.vd )4,t w6b3p lc;otpulkrm3z n)c0 -5negjent 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 are connected in series to an ideal bah7ymzq (g 40en+3 hohfttery of constant terminal voltage. At the moment contact is made witf+nhe4 7yz qogh( h0m3h 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 connected8h(:iv d dbe)u3:zzk k in series to an ideal battery of constant terminal voltage. At the moment contact is mad z3vihd :uek8 bk(zd):e with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connjpokzfz8,.wf1q / o0 v;xw+ haected 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 inductancey3m.v 8.u6gwb k, 8.zqsnk pvt 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 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 tim g 1v2q(kaw:e(ep4p,f pz b9mqe constant for the circ(ap1, emp4kz9vbwe: fg q (2qpuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are t:dhg. y))l-l5 he xriconnected in series to a battery. The battery is suddenly removed from the circuit. The .:tel ))y5hd g-rlihx 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 have the same units eqos7y*5,l0ij9fe iar xcept:

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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 ciky-fp+ 6i mszgn2w3ov+k9qt) rcuit, 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 v;1v/h6t f m9vrs2d7 zsalu,bsupply. In this circuit, the current9lv1vmd ssba/2rh ,vz;67 fut

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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 rt-2qhdvq +0as re,s, circuit changes by what factor when the frequen eq,2stq,h r vrs+da0-cy is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the induct1mo.h1 ffhkb 0 y-,.pbsr4te/ iw6 ruyive rea fok.r.pbhm4- uwy/y frtbs1e 0,6ih1ctance 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 inductor approaches zerpz,.cysog6mgdvb22h yu b +.6o, the inductugyb.sg.2 62hdbv,o 6mzyc p+ive reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this cft2x w)ob.6veircuit, the curre.o6vfe)b wxt 2nt

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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 circ t :j jn75k/qfy92amlguit changes by what factor when the frequency is triple27tm9g:/jkf q5yjnal d?

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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 approachewxf7+c8lkxy 1hz /ur:h*b * ibs zero, the capacitive reactance of that 8:1 uky*r f7 xclb+hbz/wh ix*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 t h2eeip3u+h2zor4s3 u c fq2)am2v)nthe inductor and capacitor in a RLC series circuiteane z)2vtcq3mi+f 322uphrh 24)u so?

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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 all +mk-,, v8dhq. elmrs $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R in9; ti b 96a+alrg8owzacreases. Wh;oz9rw 9l b+i8gaata6en 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 impedance of the circuit increases ikotmc;gypt en5p9 1 /tu15z(i f $X_L$ 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 circkq+4c joz. /xiuit 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 capa5nrv :z7tjpz- citance both double in an LRC series circuit, the resonant frequp 7zr 5jt:vz-nency 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 voltat+ xq*+uq:f0h/p:xh8 xq sa ctge. 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 ovv+9gu qhyg, ;; g:kuwhen

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field ofn8d ao2 rc:is8-4pcga 0.20 T. Find the magnetic flux through the loop when the plane of the lcca -d4o8anrip:2 g8 soop 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 magneti+k0+ qk(g .ff)zntx :pxi/im4 sjt.mc c field of 0.20 T. Find tps) xt( f.+ n0z gkmx:/mi4 fti+kj.cqhe 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 0.1cxhu 5*4 7rhzd0 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an a7 5ch rh*uzdx4ngle 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 ho9,lid/)x g lfrom $1.0 \; m^{2}$ 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 cz,g i8c4yxk r,hzwx)/hanges 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. tti7tq(cmm9fwq6p 6 es35g4/e ae iv6 A uniform magnetic field is applied perpendicular to the plane of the coil. Iegv( qt4t3 pimet7w5c /fsm a6966e qif the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns andaee 2 wjn,mw0iq74b3d 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 area 5y m8n. 2djpbk$0.20 \; m^{2}$ 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 horizontall5tjk :4li :shm5shyv6 y at a location where the downward componenkisy ::m 65 4shhjtlv5t 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 x 7 bdpr,qih6/-ne ms0that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its /ie,6sp-brdm7 hn 0qxends 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-sectiontu);/f c4wq;r6dx)ulny a1u,zfvr5 /d zhl / gal 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 100 turns of wire of ar) ctz wgw.c3sem1/ c7rea $0.090 \; m^{2}$ 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 armaturef60+)kq6 d(kt4 mexzo hqcf,3sgi vc;. 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 rotateogzffh)x,(kq dcskt;+c e3m46qi0 6v s 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 oft, i0oto:5vr qw,h; qmhd.ps 7 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;r4x ch r1z x.u3l9zhm a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetih 1.ulz4r;r3h cxzx9 mc 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 generator ws,y /:xqk /ajdith 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 mob lf hjqi,nhn jr f.24e/87p.*4brlfgtor 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 rd/,nfsys q6*n.uc nmw1fegu ,.* un /pesistance of 6.00 W. The motor operates on 120 V AC, anu, 6./ nm*u*n.c fg1/nyeufds, qspwnd 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 au sh,19;mm2*g8uxbu fu3 e9vnxc y+jc hc ry08 24-V power supply. The operating current is 1.0 A. What is cyc xue, r +n1umx298h j u;08schgm9 yubfv*3the 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 Wn -ypvjs 6sso7z),2xh is connected to a 24-V power supply. The opeys2sxv7h )p snz- ,oj6rating 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 to2r8 bskoey:3 +3leuft a 24-V power supply. The operating current is 1.0 A : y 83oetlu3febks+r2 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 transforme7rvbt cd6r md(cz7p6 4r is 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 of a transformer causes 14 A golqjpt)6 fww b90+qeg+x*b9to flow in the secondary. Howt)e9j0+ +gxbf 9pw*qgob6qwl 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:n7sd :vj .jxg7g1hay the 24-V secondary has 100 tug yajgx7h nd1.7:s vj:rns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-ta +qo6 w1 dzffwok7.x8urn secondary coil. If the current in the secondfoaf7.8 owq dxk+6z1w ary 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% effira1*su4, hg peciency, how many amps at 24 V can flow in the se *g,rsphu14eacondary?

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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 wmegy)r)z* rnwbi.udlzr 0.g/0t9 +a at 10.0 mA. The primaryuar/+ 9 wglitn)r.e .m 0*wg)z0y bdrz coil 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*v8vyd o /x sny1zs2l9 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, whnv1xs/v d8ly*o2y9 zsat 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 harywvdet7 3; q. (-gzxc3 rhle+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 current is - exh rdygt 7q+lc ;3v3zw.e(rpresent 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,ca h00f:3 zm *shvzat- ff7rr secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondaryfa r,*ha:-rzh zsf0mv0ft c37 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 turno6hqw.csd)o.jl-*t o i(uqp/s. If the input voltage to the primary is 100 V, we can expect t-.)( l 6idjs q pochwto/*.uqohe output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turni wh0l6 avezwy5:p *6 u2mv3eys. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecti l0pvzmee63h25ywau6: yw*ving 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 a58.l bp vyxd360 A of current at 120 V. The voltage is usually stepped up to 4ldp3axb85v . y500 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 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 usuall0ni p(+r1 oogwpzc8l5zp7krk:q)l 7j y stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. 7pjnz:l)q wg c1rlko7z8i r0ko+5p(pFind 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 usually syvfe (j; ci7h8tepped up to 4500 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 i e7fh(vc;y8jif 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 Wamp sgnk+1u9:9 obg-q. 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 pe9a :u +skogb9 pqn-1gmrcentage 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 resistancegw v4 4vnwy15 ,8czfni4brb ,g of 0.60 W. A generator produces 100 V at 7w5wn4z,cfv 1i4nrbggy , 8v4b0 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 1000 V. How much less power would +:1 prbdi o(;( cj1tut,ncncg be lost if the power were (ntrt1i:ujcnod ,+ (pcc g ;1btransmitted 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 Avrsllr pexprg/+p6 bm1l5w 6o*zu, 6+. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generato,l p5grmr+/polr wvu e6s*1zb6+lxp6r 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 y1 nc*/*hr p gc*cvle-of 5.0 A. How much energy is stored in the coil's**hnp /ccgrcy l* ve-1 magnetic 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-o4p sj)x maiokqh16+ -H inductor. What is this circuit's time constant?-o a4qkopms+hx6)j 1i

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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 ovyby8 :4j ,lax1knj.the rms 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-V AC outlet. What ipw-/ dpd f;.q w.x.xe64c+bo f/djc pns 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.myhw: cn sf09 yz(ry4/ What is the resistance of the lam:/swfyy0 hnr (ycm4z9 p?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What jg z9x,t8vp0jk lc 39qis the peak current through the p39 98qcjvxz0 ljgk t,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 pj0j cvd- u.lm2ower supply. What is the power dissi v0mjc-ujdl. 2pated 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 resistokz1l65u o vy-ur 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-mtbhx 9sgqi o:o56 0t0W 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-Ws- fhun6d m6kp.e2hj1 *j hrc6 resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH f93iitt(sl;xp8 pj.i 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 coil at2s .mvv,tgsnz l6*jj+ 45sts y 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 srr ah2f- z(z *fo zp*3;tty3b14.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inducti p 9yd:/lhsa3vve 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 frequencyar 2a 3yl79kkei5w x-lgk/(rr of 20 kHz is appliedgrkkex5/il- 73l 2 yk9 rwa(ar 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 thro mza7 22prnfb3( (xsouugh a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance oxp,kkl8 3g f9c ,o8qrnf 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 is needed to have 50 W ou0ne10t yb k8ua9oe q ba6:jy(wo.cb1f 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-/2ovin /e,0 ecxoucu7mF 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 tt*98k/; onxuhkz9fj capacitor be 100 W?9xtk /o*t u;kfhjz89 n

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5.0 V?,u l1j8tx;e-6u(;j p6 .ermmpt dmp0f) qtone

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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 witw0vx3(z: fzfth 12.0 W resistance, 15.0 W inductive reacttw3vf:0(z x fzance, 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 ;u8sqt3jk15xzfre p ( if a 100-W resistor, 20-mH coil, and 1.0-mF rq31xf5k8s zj(ue p;t capacitor 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 15ch+.gnpu;) itt ))d /9cdoacu 00 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor i9na;ut/) .c)gh c+ct)uo p ddare connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH ins;ri m;f-tf: tductor, what is the impist ;;:ft -frmedance 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 cpgdtr:q9:da h 4xa ;v6onnected in series with a 20-mH inductor, what is the phase angle at 6a vrgh dp4:9qx:;a dt1000 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 stxp ud5+n :s/ r)k+yeneries circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 Hznx5e /u y++nt:s)drk p?

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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 capaciteo+5q ybw+cp 2ances is needed in series with a 100-W resistor and 15-mH 2+ob ew+c 5yqpcoil 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 bq:7s1bicv 2fm e put in series with a 450-mH inductor at 5000 Hz for a total impedance of 40000 W?:s7b1 mf2qvic

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance mustggf nh s3o:g;:qm1:ia be put in series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kg1;:h:gi 3f agn:q mosW?

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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 dg-uh(l)t3j2cwg5hzt o8amjk7 m z23series with a 20-mF capacitor. What is the impedance2mu(j28kgzhhaz ltm35 jo)wt3 d-g7c 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-mtqzn 9e)y*( lgF capacitor at 1.0 kHz for a total imped g(nt*) yzql9eance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a phaacgrt , k0m2mwgk9wteb *+x33c.v h*e se anglec we w2tg3h.g ,evbx3a rkt9*c+ mkm*0 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 togxww9hhl ) t./tal impedance of 45 W?h.)t gwh/wx 9l

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz.9h*es5ei+lndiy p -:y What is the phasi e:s yp y+5-lnhi*d9ee angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, v 11qra4 vykrboj, ubtf:78, di q:.vgand 1.0-mF capacitor are connected in seriqg4fbv87 y1v :ab1i kqor,.rt,uvdj:es?

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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 1 y:1pjied(ay;s2gg *j9kzmk a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms curren(dmy:is;az *y9p 1 jg1gk ekj2t 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 an,7o2b fa h.a sm ybpo/ap*-ho) inductor of inductive reactance 30 W are cobhh,b7-am)o fa.2s*pp/ao yonnected 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 containing mc,*k a2k-td h kxwp3/ng u;o:a 50-W resistor, a 10-mF capad3k k-ku:ga , c*2mpow/th ;nxcitor, 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 .t3 wo j3r3z:loqk0 ocwith a 500-W resistor for a phase angle of z :3 qrwljo3kc3. oo0t$40^{\circ}$ 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 = 2)6rzg 2f)46go ahpmjm 2kyy09htx qq7im 9p-o00-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving som926hq-z0gp po khmyrfx67qj9 ita gy2m o))4urce?

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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 resistagexd/z 0 :tvq1c4xvvar*54 s (4maklznce, 15.0 W inductive reactance, and 10.0x kav 4ca4vl qzzg5(* 0vx1d stme4/r: 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 a fh(+mia+2gcl o6zb 5un AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. What bd fj0 s7h/u;55qw4wh.pth px is th55wh 7h0;f qp.p4jxw/bdsuht e power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circg) x0ak e;9or8-,swu zx9rtweuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected tor kr)8t9s, eu-9gex w;0waozx 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 k oa*fbouh3g(5i.ji 9 and a 15-mH coil in series?g5aj9okbio3 .fh *u(i

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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-mFg.ybd t ,yc;d n3ihjmq*5 );tn7op/wc capacitor for a resonant frequency of 1)n3g ,7jcno; m5/*ipw hyq; c ddyttb.0 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 3akzol, +y(;em.7-mH inductor for a resonant frequenc+m ;akoly,(e zy 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 placed in series with a 30-W re751c,cuy5rr hl49f fywp1mn zsistor and a 40-mH coil if the resonant frequency of the5,5 rh1pfny9fwy ccmuz17 4rl circuit is to be 1000 Hz?

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