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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux ex *dx h,.bf rr56g3k )aihwdm,wcept

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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 indp (r rw*3t wqi6jvet:n m1h0a2uction 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 produces what kind ob,h tkln m +(d35 u-jxprt ty1es*-3omf change on the inducedrpt-,bt3x1 oy3el-mk sn 5hd t*(+ujm $emf$, 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 pd:4( q21wo,u 8moaa tjd7nhvm roduces what kind of change on the inducedmwm2hd nu,oda:vo18 at qj74( $emf$, 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 l;0c9n5r1s h i8; .pw)zydf6p toeuqozoop of wire produces what kind of change on the indurtw )qzuey .do; f0c siz6pno 5h;981pced $emf$, 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 magnetichgd:w tw v 9u..yvq-7 3aad-jc-aau q8 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, tu9p-qub jtf,rl57uz ;he direction of an induced current in a conductor will be that which tends to prodlr- ;fpq5zj7ubuu9,t uce which 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 magnet) *3 p xp *j5ydh**qfhznovau6 is held above its center with its north pole pointing down. The stationary magnet induces (when viewed f6*qh unva** o)p3j5 yxzf h*dprom 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 fla l46; rmj-r6iwcczmkd63j, yjt on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. 4;3cymkjcr6 z,6jid -jl mrw6 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 cqnv wj;(+ yw0field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field 0cwn; +j(vqwyfades?

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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 ot/xdd6gxc q6ov6kto : e 8*jz(bgw8*top in a region where the magnetic field vector points straight up. The magnetic field s c*xg6 wbzt8o(x voo dqg8de:6kt/6j*uddenly 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 regiqu(pv( 8y ,xm;-xlns lon where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil ay-(;xx vp(qn, l mus8ls 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 horizontu-ztv tb 2o20msqv4s0z.;zh tal table and carries an ever-increasing current northward. Two coils of wire lie flat on the tabl0t u4-vz22.so0tvm s ;hbzqz te, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of rx8 :n4ze4jd ;6x6zu1yms hxt wire with the north pole entering first. As the north pole ent x6z4hednt86 syrx;j :x4 u1zmers the wire, 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 con-.ys u8r / /rmy2cfmx pl(hz8ostant 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 of rotation if the f82sr myxzc-(m .lr u8yohp //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 constad.hdz.a3r 7kqz .tjbho5l85 hnt angular speed about an axis whose direction can be vartoh 7a8zqd.hl3bk5rh.j z d.5 ied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.zxsj8p)6nz (;dxe w:fgh iz:+
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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 a uuwe) pf2d78o 6;9qjwdb*u cln $emf$ 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 p6 au(9gmjrd9 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 directioni 3: 8a;.vtans*yrrr l) is moved northward at constant velocity through a magn3arai ylt *nrv8r s;.:etic 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 velocityqwwi5.ypab 6.v7;grbxt,e 0 w $\omega$ 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 tk, c*n 1s1 kf7 )pwln9t6-n7bhvry zygransforms

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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. The frezyy xpvjs :,akb l1e8)om (5;iquency of th) ebajm 8ksi1o ,:yxy5 (;zplve $emf$ 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 used tdt8p r1yyy32z o

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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 devicevc)yqx3i5o:t*m i su - 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 nb mn:1+isk 3sthe secondary coil contains more loops than the primary coil s k3:nmn+ sbi1then it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the seconda58of ;kyexo ;ur 4(nrhry coil hu4 nr8o5y;f;x o r(ekthen it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power i 6ies;-f /fkvv(extt9f) yfr0 nput

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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 circuft8w/o g o4y/tulpy+ s58: evsit,

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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 i/u bt5 ( qa6qwaaam,)vn series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the ,6/)q(ua5tab wavm aq 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 i65 1tnlwye5k7 vdp5mj 5 gnlz9n series to an ideal battery of constant terminal voltage. At thete65d515pn v7nljgm5 lzy w9k moment contact is made 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 +vn8x j:m9 gcuuxmqjoc(1s5- 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 inductabx)t. gc ,qofct s6wqhi(v,7 yr(y9y8 nce 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 indk 2o pf3f5gu(e87umacy i(su9uctor are connected in series to a battery. The time constant for the circuit represents the time required for the current 972scaiky385ug( fef (u mu poto 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 are1a.z a7es*qdy connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the tiad qy*7e1sz a.me 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 tj,mdr 7fwg7+kk(lm(v(n0oc m he same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the curc l0qdoi27df;rent

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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 this circuit, the cur+5qvspb 9 df 3,p.ikvnrent.v ik 3vd5,fnb 9p+qps

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the g nczsz7 jhyk0+o 5,1:wmb6vn1ig f)ffrequency iswn ngz1js5+v1 cfg)fm kh,:bioy7z 60 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 acuhdq;v.61x9o:gckyjl.qd5d- v/ t:tkoww 6 r ross an inductor is doubled, the inductive reactaoh;6jw:y1vo9 l-r wdttvu./dx:kkqd .c 65qg nce 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 appro ;ksv-iab 7b+uotd qzr3jf22j7v. av. aches zero, the inductive reactance of that coiba.;r tsd+ o2vbj7k3v2i-a 7ujf vq.z l

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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 p:me v9;ib6gq an AC power supply. In this circuit, the curreni: veqp6;mgb9 t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what fact m4iy2 +6e81kqagqr x gw1yj;gavfc ;0or when the frequegy 2er+ mky j 6vaaxg1iqcw8g1q;;f40 ncy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC t)-tf : 70gel*xfrvpdvoltage across a capacitor approaches zero, the capacitive reactance of that capacitorgtp-fd :7* )er0vtfx l

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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 nv v(ukr2iu 3uqs ,if606-twnvoltages of the inductor and capacitor in a RLC series t6skn,fi3uqun0v-6ir u2 wv (circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an-w s:eu fe anwy59 mr(k3/(ruf RLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of tho4u bw3a),u c zpyc1swfh3j:*e circuit increases if R increases. When iswpjwh a*bo1,3fzu cys43 ):cu 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 if 5i/ 4iupg.j0rvjuuqq59c*cu .4 tjm qsg)d)s$X_L$ 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 ci iisdl8w68vi 5z3t92qfs egg,rcuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both do+,mg7 aa:q soquble in an LRC series circuit, the resonant q aa:qmgo+7 s,frequency 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 * hfs3n(ov*gss .vqf9oltage. 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 cid quyzvf/.r84simz:wi; 1)morc y mi(i ky9( 0rcuit occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.sy0 fx v1/g1sb20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are paral xy /0bsgv1sf1lel.

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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 u cqp;x6i(zjkcv,+kp.c j +k:kniform 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 perpendicularvkzk+,. p+k :(;jcjxi kcq6p c.

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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 rotap2qg) wt9 s 1*abgx4qzting in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop wheq*g4ag)t qwxz219 bspn the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop ise/(.d yksqn -r 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 coils, svl/ wx);5h8ync, mup. epw 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 -9mtbivzwn8 r9frzhvu ah +3,,+li n: frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly fromrz,a3buhirn++ tvm:8,l n-h9w i9f zv 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 wireu/g h;i4q58-ewd oaij with 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 andfod+ en 1y04yid0yzh 2 area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a osl7pt*7 i0zc location where the downward componen*liszt7 p 0oc7t 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 angular veloci ecv-/6+zijg dty of 2.0 rad/s about a vertical axis throug+ z/6iegv jc-dh 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-sectional arexxo.pj. j.rf 7s p;k rvvs,vzlza10(8a 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 rhmtpmd(yzkj:6. vv .+ra5y4 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 on22ug zvq9izs7 z;qgj/ its armature. 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 output voltagevqz7z 2zig;qsj9u 2g / 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 consis 5x.+ ew-ycgqqts 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 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 wr1a8cyi:gw3m/no 5tto construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is availabrmwwg/o1c38: ytain5 le. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximuvwibtjz cn+:,z** rac8c g38sm $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor o3*m h unpy;7jiperates 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. T+lak48r9hc ndhl uhmzf 4p3 (l7pq,+ xhe motor operates on 120 V AC, and when running at full speed it gener fqhc34+l478pzr um+dh(k9px ,l lanhates 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-wm7dk0/e.v m)k9is r nV power supply. The operati/0mv7k kdrs i9wm.)enng 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 6.0g nbc) 8/weajwi;z7. fn93 iht W is connected to a 24-V power supply. The operating current is 1.gifzj nn 3/ 89waw)h;tie7 cb.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 supply. 3 bdq)ac -++j: rusxqd// ctws ,ndbe6 The operating current is 1.0 A at full ce+r d6-bjxsc) /q3q:t aub,dnw/d+ sspeed. 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 )xtbxw ;3ivw/95jw c ga 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 tran+fap or17 u0iesformer causes 14 A to flow in the secondary. How many tu1fr7uo+a0 eip rns 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 prn9 gwt97i bg)ximary if the 24-V secondary has 100 turns?b7ggt) n ix9w9

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists ow8vf+dvy**nbnp; rm/ ly*+ en + ss9syf a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary in+ rsb *vn;s9wy+* ln/fs+p* veymyd8s 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 transformercn1 f/x-ly2n n. Assuming 100% efficiency, how many n/ 1nc-n yx2lfamps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon;ac m ((aku5jn5s-lt t sign transformer provides 7500 V at 10.0 mA. The pri(s(5j ankct 5al- utm;mary 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 primauv g +;b58pptcry coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the 85ptv; +pg cubprimary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its snz.1bb+0)lioud vcf3li e5 *g econdary coil. If 120 V at 2.0 A is applied to the primary, what current is presl du0vco5)1b 3if+n.gz*l ie bent in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200)z8t tg+.z 6a.hf dc 7af;scns turns. If the input current at the primary is 100 A, we can e 7ss8h.ftz+ctzd a;)c fagn6.xpect 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 ymtu// //yra4ls+ /gx oa-xyland its secondary has 200 turns. If the in+os /lyu x//yxaa /ly m4-gt/rput voltage to the primary 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 turns and its secondary has 200 turns. Inq qg5f;b-au 9f the power input f9abq; -guq5 nto 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 voltagejj2hd+0 ;m)e g r mk7wvc7tyi, is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turn y0ktg;d2 evmj,c+)77i j whrms 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 volth h:f- 5p*.l cy.iiptyage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Fin ly5hf .p.yh:ti p-*icd 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. Tqdu593:hjvzn y. v36vtduk-ghe voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. g6udjv533 yn- h v9kzqtudv.: 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 resistanc/b,m2;vj,uy jt5xndne 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 ob nm;x,/t j,n2 uvjyd5f 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+r2o5dy)lpy 9r ec-/ho* srri. 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 enere/pr+r coys2*59d-o ir)y r hlgy 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 (wj (b woa3r)aj70o hxpower would be lo07ww) ao3oj rhb( xj(ast if the power were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted 1q0 f4av* 7ttis ,pu q)a:kcbson a line with resistance of 0.60 W. To what voltage must the generator:bi40q ksa, *vt pqta17u )fsc 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 mudqcp- *47i/qg s cbmy2ch energy is stored in the coil's b2p7 csmdg/yq- *q4ci 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-H inductor. What i)pj13e*nft t3iff u(is this circuit's time constan(1 t3*f pt)if3jnfeiut?

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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 whekxn1t,k ) yi)pre 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 is th :8b ou3ab9qk y:mnli.j/9sxwe 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 the resistance of the lagx3r 4jp5jywmv(06 g8qwm tn-jm-sp 8mjgm8j (54q-0 tmwnxmryv- g3sp6wj8 pp?

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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 is the peak cmn5tky 1203seiybx -gn hp 4tq:+l9c murrent through thnq0i:2-1 tlec3 yg9mn yh 5x+p 4mbtske 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 rd umv4lj*vpnp4l72yg j 1j5 0120-V ac power supply. What is the power dissipated in the ru5j 0d4ypg lj*1n4m vrlvj2p7esistor?

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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 resis99fkyj-wr cn *tor 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 )i wj8r0 bt,fb/tdr0oresistor 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 resi5 j2e;kqjlivb t.3)ff mt74it0 kd81n.hnojgstor 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.+j b6.z k 1cup.xrk*cuo,tfudq, d4p30-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 reactaqcl o:(j5x*pb nce of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive rr c4f(cl8/ hbw(spt 3neactance?

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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 inductive reactance at 10;kv 4pe4- hxen00 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 /mbm ;)-urk8;tnpywg60-mH inductor when 120 V AC at a frequency of 20 kHz is a ybm/p ;tnu;8- gkrmw)pplied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH k88sg +,x*krmv+* w2f d qokuycoil 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 capacitor at 10 kHdoy-u8y(h h 4v 7irbq*z?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactav+p3go bn6ln mu:e wdtrclq-3-l ;v)y h8, /wfnce 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 of 120 bu qa1xki:ca*o 5(t8j. bpd;a0 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 fu5p*q -e/ (zql(cgid reactance of a 0.010-mF capacitor be 100 W?- 5ceuqpg qdz*f/((li

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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 throughe)w5ca8 yx;y f a 0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance ocuo q op62y05tpr+jc vid35o :f an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capaciti6rt2p c +5yp30q5o:oudvj co ive 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, and ,r h(ud+geq qbqh ) ltl9pbo(:zf.*(a1.0-mF capacitor are connected in qd+q ( hlehqbb( lpftaz* :.,)g9rou (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 angp o7ivb 55z.mcle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected ib 5vi75zp. cmon 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 ib g(nv3 s87wnsa:89 mf*fjsbonductor, what is the impedancns8nbfg*7 j(:fa9 3bso vw m8se 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 il wl(4 rcs8ubq3cn /620-mH inductor, what is the phase angle aturns4(c3wi6qlbl 8 c/ 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF cap6ili*d+w+h u y1sh -szacitor for a to+ ws6ls *-zdhhiu+yi1 tal impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W reb5edq owa ; c*kn56g+)2l0a t7oazmnl sistor and 15-mH coil to get a total impedance of 110 W at 202 lo ag5)dcqe; a n70n56zkobwamlt +*00 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 (lr5b w0a5g wstotal impeda5gw ral0s bw5(nce of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for a t/oqh6m-zp :t qotal imped6q :m- pht/zqoance 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 connsn20byvl: uvn 29zr;uected in series with a 20-mF capacitor. What is the impedance at 1000 Hz2bv2 0ns ;nr9yv:uzul?

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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 kHz for a tozwrsy9 wwsh4 n+q6gg 5nvb94 c i-*6fttal impedanc6qsgrz nyh 4n+ww45f9sw* t9b- vcg6ie 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 at6qa8u2br/dmyvh j4ubx .-;s q 1.0 kHz for a phase angle/d 6u; .-jxhas qr42bv8 qmbuy 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 3t*7; :wl2ry +kcxkgu :ntgvuw/oalw5v )op (needed in series with a 30-W resistor at 1.0 kHz for a total impedanceyc rl:uw;lww3 g(:v72k*g5/pavu txo otk)+ n of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 H j 6u+ey3ou+cbz. What is the phase angleyojc 6b3++ euu?

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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 fz: :4x)8eziio r36v 0d9 yszdvgd.hhV and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serv:xd.) 40soh3fi8vdz ergd i96y z zh:ies?

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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 o i *1h;+suwpmka,gw e6f a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inducahk+u;mp g1, ew ws6*itor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, jnny /n 9nb6n.08jh*7m tnph ta capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power sou8nb 0hjh7ty* ./npt96nmjnnn rce. 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 c)l: :tfo2a 9aprk 9pwfor a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor:92orpwakp fca)9 :tl, 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 phk iw s zh*,*cq+vymroe q5w3)3ase angle of z+vk,wh y*3mse oq wir)c* 5q3$40^{\circ}$ 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 z tbi0v2ewq3 98ltw6;0dtnnt-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to nwt09vtd03tn8; i q 2lwe6 tbzhave 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, 15.0 Wn :l,zgz;e)ndfzn0zyd5 8i h9 inductive reactance, and 10.0 W capacitive reactance, when the circuit is connectef 9dnzn:g0),hz nd8yle z5i;z d 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 AC cirf3a5he4 yd ctz;l-u k+cuit 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. Whga g6jx: 0i1gy g.wlw/at is the power factg1xg g:g06 iyl waj/w.or?

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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 anxl-- gxpq2t8w(o /k f series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-Hp wf8qx-(- 2ox/tlngk inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1ju/d7ku7:rhk .0-mF capacitor and a 15-mH coil in series?h ukd/7r:jk7 u

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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 resonant i u. 3epx0rkm36lc5u kfrequency of 60mux cke335ul rkp.i10 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 inb6mm wmpu3xn,m. 85ci series with a 3.7-mH inductor for a resonant frequency of 1000 mxcp35 w 6mm.ubmin 8,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 serie5vwx-av 9wo1os with a 30-W resistor and a 40-mH coil if the resonant freqw vvx15a9- owouency of the circuit is to be 1000 Hz?

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