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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 magnet/f1jf:pzxnj (e *vj:izm3 bm0ic 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 inductiowtj r0,q09.gggsu m 9ln 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 coid /,lhub mqc1q2 )ixu1o el-y9l)dwp. l produces what kind of change on the mbqcpl2 dh/)wu,)yi 9d 1lx 1q eu.l-oinduced $emf$, 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 ojft2zpnt5 6) mf the magnetic field through a loop of wire produces what ki m5)tf2jn6 tpznd of 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 diamete-lep- a6d kw0jh9ile6 r of a loop of wire produces what kind of change on the inducelw6ajh p-6 kl0d- ee9id $emf$, 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 removedx1lt/qyb;lxn-rf5 xm- f1c /x from 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,skwqqchc10k-rq8av :4p q,8w the direction of an induced current in a conductor will be that which tends to produce qv8pq4r18qk q- c0,ch wwsk :awhich 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 rtn, tabjmtt,9;2mi+ table. A bar magnet is held above its cente m; +m9jtit,tn ,at2brr with its north 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 qlezm;add 5 7v2; k r(zzb9wq,table. A bar magnet is held above its center with its north pole pointing down, and r ezdakd q,2qmr5 ;b(w7zl v;z9eleased. 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 tablv . izd1,tkpc,e top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When k.,z,tdvip1c viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic field vo-4l*saw. c vt yhs,l:ector points straight up. The magnetic field suddenly grows stronger. When viewe:hc* sll, to4.s ywav-d 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 horl zvu;vsg b2,8,)ebpu je9 ejg64ml6 yizontal table top in a region 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 el8by2p)6eb;zjj,gu9,6lmevuv g s4 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-increasing c8lcevo / yu-3qurrent northward. Two coils o3vec -/uqyl8o f 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 loop of wire with the north polb/h,dip7 n f*ge)ds 6ae entering first. As the north pole enters the wire, the induced current will be (as view7p, nid /gsbfe)6h*daed 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 axis waz/d 0j- ms0 zx42nsgmhose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of m0a/ z24 gnsjxms-z 0dthe loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is ro..pyi)kxq s,40qnz p(a /+jvjm2 xkwa tated at constant angular speed about an axis whose direction can be varied. In a rep ()niqsajqj. .+kk,xm/xwyv 2a0 zp4 gion 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. u d8bk8 asl1(awqav+0
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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 am3cfe;le2rj g lqe;3v8rh2 p6n $emf$ 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 m lac) 6pou5mzgq0 bz,5agnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is movemp4wq / y)4wn xoj5z;pd northward at constant velocij5p4 qzopw;4mn) /xywty 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 angulaehl -b o+x vdq4j6vengu hj2v)l6mm :3 e;g6g(r 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 transslyf1rq u(vjj6hy0 8)zd6ba9forms

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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 frequencyargbuz3r / cy63.+yy d9vy /cc of the +gr//y9.va36 c cbyz y rcy3du$emf$ 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 to;p 9f-52/k qbv (sejronwxo0h

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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 x+,gtw,jn wc,e 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 7h4e))lldt7 wbo 9nbd the secondary coil contains more loops than the primary coil then it is ah l7n td7ble)o b)w9d4

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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 secondar2( :l ;0xuxu pnuzegk1y coil then ite gpuxxuzkn 0 ;2u(:l1 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 pow u9 r9cro/b*(i ub cy72p:ibfrer input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circuit,o+i zikrw2oqb;i9q+ .

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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 cok,: ehn/8xg, uomh z.l fe,h;mnnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, tgmhu, ,mxfoe;eh:k. z hl/,n8he 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 ar m mig(lkje /(,a+03oyb ;wxfce connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the batterje/ 0ab k,(fwgim(3;col+yxm y, 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 rq7s /bt.wdrr6y m +x)zesistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistancef 2h4u0 6xhnf/0ocr l mssxy/; 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 connecxd:frvl/akj83 :l(n 6 qvfrwis0ae12ted in series to a battery. The time constant for the cirvr::xw q3d 2fnvsr li8( l1aa0/kfe6j cuit 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 connected in series to a batterya.exoq 5i ) i37 hxxn9xrxda2,. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease,aix73xe .ox xq )dxn5rh9ia2 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 jf i4.kf/7g jjexcept:

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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 + wj f8v bugw/;qx;;iaoz;wb6AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is co8fq s bdjy6wr8,2lue5nnected to an AC power supply. In this circuit, the currenf uy8sel,brjd qw8652t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactanc+v*e ,:c vftcqe in an ac circuit changes by what factor when the frequenc+vc q* ,vctfe:y 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 ACnjpd +pd 3k+2ualqcp)2 2o r(x voltage across an inductor is doubled, the inductive reacta2xjp+ u2r)3 nkqc dpdol2p(+ance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage ac7;k2ddr qxbveo2p 5r1ross an inductor approaches zero, the inductive reactance of that coi;2rqd 7b vrde2ox5 pk1l

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC pow, f68jd7h8l x jgo0vjzojr/0fqqt1t*er supply. In this circuit, the currentl*t8ozq1 fjq 68jj0gh x/ v d0,f7jotr

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance ifasu 0jz /wa) )z;1 0(i9yi*cjdkrd urn an ac circuit changes by what factor when the frequency is ti au/1wfjz0z9jr;)*r d)uk(as ydi 0c 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 approacsz nte+ ,c6jz-hes zero, the capacitive reactance of thatne6-+zts ,c jz 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 capacitor w0zfxezeojf;e b 3:69 in a RLC serie oxej0zeewf96;b f:3zs circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined as b fh9 nmj v;(-g)wx+ha$\cos M = R/Z$, 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 thejc9fg -:.8g sb /etqto circuit increases if R increases. When iss8q: e /-bjg9 tgc.tfo 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 w uo ib9.7b9x qtd6kdplf-6s-if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. zv3)maeeg o,ywx:+ :kThe 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 both double in an LRC .dmgf 8g5 )qp ds7k3zoxlf f-8series circuit, the resonant frequency of that cirk8pq gd ozxls537. ff-d)8gfmcuit 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 voltageyow8 bhcfy( g+538a zh. 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 Rc0(.rip4)pfb xq8ih/pr 4 dj1t9 p cxsLC 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 magnetic field of 2ltq qh -wdp070.20 T. Find the magnetic flux through the lo2wqlh- q07dtpop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of,i 3*iffqsctdci;lv - 74hi0e 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector areftsi;hec l3fv-i4q i0 ,i d*c7 perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magb mx ti;0jbx:i9a3:einetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the lei:;ia 3x0 b:bxjti9 moop 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 loopwj r(bht .5j;d 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 coil chan m/s0r aqaok*,vm80wqges 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 ; ;c,w 5qw;nu 3kifsb0encqf/with sides 18 cm. 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 s0c/;q5ei k;un;qs ,3 wf wfbcn, 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 and an area of :riv(e0ft4a n $0.40 \; m^{2}$ 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 are6tlr6po hiys w3 - mapjy115,la $0.20 \; m^{2}$ 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 loduoq. :7z fyj-cation where the downward component of the Earth's magnetic field is.duzq:jo y7-f $6.0 \times 10^{-5} \; T$. 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 tha*bjn,u y rx9i ht2bt-*t is 2.0 m long rotates at a constant angular velocity of 2.0 radxyu 9ti-2bnbt, h *jr*/s about a vertical axis through 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-sectionalyf ( zvl)u 1hvy.i+9qb 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 1pv/(a 5ehh s1ozk)+dc00 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is 1)whazsf(4 w,1 b5knzu2 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the sn zwub(k5h a)z4fw1,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 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 consis6 +txne 3d:baqts 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 to construct a simple AC generator prbs2fof p0 hw:s;6x2 with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0. fp60s:2xofhw;bp2 s r050 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 wivps/tmt08 6i0cmpul(a9xeo 8 n14 ieoth 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 motcg4qicv1j 0*sor have a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance oxqjp5gf(43jl x0b7i df 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a ba 4pxq3x7ig5 (df0jljb ck $emf$ 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 itvz o)ux dn8swo yq;o ,i6y4++s connected to a 24-V power supply. The opedwxn, 64vo q+oto8isz;+)y yurating current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24k by5 9*zsfxm)-V power supply. The operating current is9b*5zms xkyf ) 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supufu wb1(z pd.zf8di)- ply. The operati z8()du.ffd w1biu zp-ng 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 rhe n+1ut qjc(5 v5 ;quyi+kp*-kbm;poeduce 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 transfoi;(g(m a ;k(/knzvdesrmer causes 14 A to flow in the secondary. Hsve(n/k(mzg;i; ad (kow 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 a4zy n7t.e8en ivx 6a( 1f7 w g7::rgi9smdtnain a 110-V primary if the 24-V secondary has 100 turnnxw.7 ritvyian 916 7z:7 t 8asamegfge4nd (:s?

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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-tukti.xu:cp 2 ny,)z 7tlrn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, w,z nt)k2icu.xp7l :ythat 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 flowsp-4ah)s/bk3 f wo/hc k88 apeq in the primary of a transformer. Assuming 100% efficiency, how many amps8ech )kqpokp384a /fhb-as/w 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 sign transformer provides 7500 V at 10.0 mA. Th ih*rv)ac:u ,qe primary coil oa)qi :cu,hr *vperates 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 ks0 s78kk2 y e,uoqmn4has 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 voltage is present in the secondary?4k 8unmko720e sqsk ,y

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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 primayarmls 7 1.*r- fgug5(*kwvtz ry coil and 300 turns on its secondary coil. If 120 V at 2. *5ygg r 1vl-7k*wft(ma .srzu0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turni/ce wd jl5,2scw11g cs. If the input current at the primary is 100 A, we 1 sc gwc1e/d,iwcj25l 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 tra sjqbog 8w;:(gc/+f: wb6 ,o/tyfvdp gnsformer has 100 turns and its secondary has 200 turns. If the input vojw+g tb ,g/:ws/dqbff (cvy 8;pg6:ooltage 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. If -zae3 8x 5lyh9k 1m4pzuqiv7h the power input to the primary is 100 W, we can expect the power output of t8a7eki-pl1 m9qhvh x4z5uy z3he 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 80re/fo.:cop re/u dn 60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary hdee o:pc f8rr/n. u/o0as 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 currents:izt) 2f2lv t at 120 V. The voltage is usually stepped up to 4500 V by a transformer and tf2l:)t2sivtz ransmitted 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 Vc/zww e/vn /f(. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find thvzn(/w/ e/w cfe 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 lbvg txgv ;:qvmu8 q8fh17*r0aong has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order tqa um 08vqgt*f8rbx 17vgv;h: o reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were 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. :l1e9y 1sf rns,/tqqz A generator produces 100 V at 70 A. In order to reduce energy loss due t9q1y/ tf1 lnz :,ressqo 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 transmitte bd nj7ln1/2m/tye(ka d down a 6-W line at 1000 V. How much less power would be lost if the power were transmit7kbj m(nyl2td//e1 nated 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 44 zq75 54 jmnph--iatla0 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the gi-pmz5-j4a7qah l5 nt enerator 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 A25 3gkd u0kkyz. How much energy is stored in the coil's u kykz2 k503gdmagnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. W ;r-ahtgeijkq7 s1rh.ti9h 1 2hat is this cir;khteq1 j7i.h ia2s9gtrh r 1-cuit'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 2 ,et4xgu /iol29r ahcwhere 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 jdm it) s.*9lgaz,t8moutlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC oh(gon )q(r dk5+(-a*visix ;lck ucb1 utlet. What is the resistance of the lamp?-(1(ksvqbohd;k xc* i(crg l u)an+i5

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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 uqlwl:s x8n+vj 8/*etac power supply. What is the peak current through ws*8 elx8+:ujt/lnvq the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What iclxarltfq u7( :m 373qs the power dissipaaqf7q3uclx 7r:3lm( tted 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 51jl*gj6cq- dazyv t2 acs25; b0-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50457tip:t/m6s uv txhh8hcuh u5e fi*))pac *e-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W ress 2m/6gfjfka .istor 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 inductokxs yngs2sq:0ia8hm.1l7 dr7r 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 reactan+t pskkr:0zp)in sf,+ce 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 havvhyq b4n78l5j xcc5 fb/cg5,ue 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 n :nq c;)ptt,pyecessary for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor wh/rm3 /qa0 7ty1gvdywjen 120 V AC at a frequency of 20 kHz isqvwg0/1 y mdrt/7ja3 y applied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current txxj )tm*0bj 2r1+ edjshrough 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 of a 4.7-mF capacitorl t;q fd0on53ad 97o9yp1xlir 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 of capact dh*r9w 4aa9mitive 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)rwzz q t.v;4e 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 wivazmzj5d3q/fbhrt : sg + 91q;ll the capacitive reactance of a 0.010-mF capacitor be 100 W?q v+a: msjqz1z;hfbt5gr9/3d

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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.u+0t,wi am i:h0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistang2zd,m t; 5t t;h)leubce, 15.0 W inductive reactance, and 10. uh tbmg;5,z)d;ltte20 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20bv09a0toyz tqyrj09 *k tu nt/6uxun 6(+ir)k-mH coil, and 1.0-mF ntvo9xuj0 bn)y6ayu q*0kt(9tz /k6+0 u rritcapacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, 3a;x ( 5ebzlgqand 1.0-mF capacito;b3 qalx(ge5 zr are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is theco5)bty rri hajdvsr u3v-,)q6i q.+n2n1(yk impedance at 12rsqnikvdjbq3r5 oh( ) 1 rat.,n6icuyy -v+) 000 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 conx-ti 2ajle q9t+3f2 benected in series with a 20-mH inductor, what is the phat+la eqft2e jxi239b-se angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH g 1bjr b 9*d+ww2- xk*ylo7cmxcoil and 1.0-mF capacitor for dorgxjl *cy+ bmkb92w1*w7x-a total 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 witzr d oh vz(*m4ojrt0;0h a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000(r*vm0tzh0z d;oo r 4j 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 p/xr8xqcj l9ce pvqsr62+d ,g,ut in series with a 450-mH inductor at 5000 Hz for a total im, dg p2j/ ,vr qrxq69cs+lcxe8pedance 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 inrpl (ke*t 0860qfybpopd-d m/ series with a 100-kW resistor at 1.0-MHz for a total impedan dok eqp-yf8d *6brp0ptl(m0/ce 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 is the imp)jv6vii7wi.8gwr . /v s dnka7edance)v/svjw .da77 gini .r8i6vwk 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 ck yftm;s4fikwl *4bps65 *p8+nqoa7 aapacitor at 1.0 kHz for a totalfk qs*n p8w mt5a a sy;4+blifo64kp7* impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needz,uh8 zczcm sw .j8z0ax3i:2a ed in series with a 10-mF capacitor at 1.0 kHz for a phase angle of2z zch j.:a8az3,8wz smc u0ix $40^{\circ}$?

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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 t nl 1oj)4*zz: p(paydkHz for a total imja tz :p)p(on14*dz ylpedance 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 Hz. What is,w-,)tdsw 1v 6 aar uh begd3 vz:,z3f*7jccar the phasr c sd)at awz6, 7vgh,d :uejcw1b*3,r3vz-af e 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 coi6 g tf ug+y,pxhtma(*ju39g(pl, and 1.0-mF capacit,jgtftypgu( 9h *(g +3u6mapxor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0:,o sf*6b lwr6elxtoq bz/9fn5 l4pb8-mF capacitor, and a 0.350-H inductor. Th o elt l ,p68olz:b xrnfs/9*f5qwb46be 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, a capacitor of capacitive reactar.iwl1r/ m rp6nce 30 W, and an inductor of inductive reactance 30 W are connectl1i/ wm. rrpr6ed 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 a 50-W r(j qaic.2 r .gwhz8upx/* g3qbesistor, a 10-mFg.b2wq3pzx (* 8a/jc.h iug qr 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 fkm(w:9 vr4 uvb glw,+vfofu*4or a phase angle ofvkw+:r ffgm4w*lv49 ( b ,uvou $40^{\circ}$ 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 :+st,wexi4-nj hmg4b, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power thjws4, x met4:g bn+-iransferred 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 outpuge .a 0regjt ;j;2,o;oc;8 d-csbzzcv t in an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactan;; je8zb2 jg ;acgct, o r;.svc0dze-oce, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an A7c. z7edqj7t9vfs f c4C 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 hasu 8pv-oz o8cp0 an impedance of 60 W and a resistance of 30 W. What is the power factor?c-vpp u o8oz08

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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 forsmas z8:gg- n pnw:*;i a series RLC circuit containing a 50-W resistor, a 10-mFsgs i8aw*n:m-n: zgp; capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1x : lja4fs-bz+.0-mF capacitor and a 15-mH coil in series?jbxls+- :z fa4

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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 capacitkmniw6inf l.,(i d3y00rtnx 2or for a resonant frequency ofnid0kyr6xli0 3.fn nw(2 mi ,t 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 wi2 yc m4 xssqdtc )w3w3mbot0jid-5hj1m +3d:fth a 3.7-mH inductor for a resonant frequency of 1000 H:2c+sft3 0c j1y x33ojw5d- w)qimmds4 hdbmtz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and y vit ;5tm5oa(a 40-mH coil i5 5( ;ioyamtvtf the resonant frequency of the circuit is to be 1000 Hz?

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