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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 magne*f hv(3e 32d3;3av 5s di8u atowoywlftic 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 indvu :f gbx3;0gz, cmg)pvt0p 9yuction 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 kqncug*6e-wk4 ind of change on t w6qek4 *cg-nuhe 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 magnetsjl,-r a6k 7k.pag d7em ex0-iic field through a loop of wire produces what kind of change7k kai al6, gxm-e-.0p7j sedr 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 loop of wire produces what kind of change on w*xui0-(01 v/g0 yuoq,gek;zbw kb w kthe inducedouxwgg/ ybq(i*kvb;1k 0 z0- w0 kuew, $emf$, 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 magnetic fie 8lh)tz,krmk 86ir( oc 1b)xsrld an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an : 0y of)wjh,vsu 9*woainduced current in a conductor will be that which tends to produce which of the following v ajwu*:) ,yow0o9hfseffects?

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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. Atuq;+ azwl/a3 bar magnet is held above its center with its north pole pointing down. The statiou; a+t lazq3w/nary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet i)zr6n tyfn:0vj/ uzkp:l( h p.s held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from a0lhv n6 r:).ppkn(y/ z:jf ztubove)

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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 tab*f q13cva xgqb8uf,d1; xdc r6le top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense odc x3x* gd8,cbvfa;1q6q1ur ff 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 magnett**ow8 ikpna9jw g(hp; a)s2jjh7d b.ic field vector points straight up. The magnetic field suddenly grows strongeraw2pgj97bwohs;nj. t jh*pd(ik8a)* . When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetic fi (as4z;s+gans -8cyz6cbienrv/i g 41 eld points straight down. The magnetic field disappears suddenly. When viewedi gza/-(a b 6nscvie4; +4cssrzyng 81 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 cg/w 8n:08pt auca 6lxan ever-increasing current northward. Two coils of wireca0pxwt8/:8 ugna cl 6 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 polez45r -ln (kbi bmv*mz5g,*c xg entering first. As the north pole enters the wire, the induced current will be (ab gbr,*zx5(zg -5*immcnvl4k s viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about anzv)bcne57av s j) (oa1 axis whose direcc7 j)nea b)aso(vzv51tion 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 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 rotate: zptzn2 )zz9)4h kori5wes8ld at constant angular speed about an axis whose direction can be varied. In a region w:9lnz8rzetwk 4ip)25z oz) hshere 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.gr+ .d)1k mqqls,nn3 xrnn 76c
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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 . g ug5q,mndyhbcq /(rbjl ;6(an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field.hrvos -7; ztf) 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 (orien-zohdjfhqn/ 8 c0hd4 r1i q.t(ted in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning theq 8hof inq4/r zdj(.hd0 1-cth 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 constan)r +wy( dp-j d/f1kv(szcs5bet angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transgu u,p9*l x*2-ihmu roforms

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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 sers* lgeh6 9) 3usxa,oncond. The frequency of the3e,uhr6)*xoa s9g lsn $emf$ 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 q mi:0iv)cps+8:5ly:nritt* hg j mg. 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 devc+ 84iah cqck*ice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the serdn j-x -:mi:2mtgdnhyum (,:g 0t )urcondary coil contains more loops than the primary coil t:mrx:ym)gru -h,tnn ut0(gi-d2d:jm hen 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 pux)n9ba2 kw)contains more loops than the secondary coil then it isbp2)9uaw)kx n 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 inpkcj 2u 2xkgr9y a,i)n b7a7j*kut

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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 resonantrx/ x 8g0m)d 6qudsb/j 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 induf8zn(:(5ri5rvn c w)xdb 2hwvctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made wi b255:fnr (vnzcwihrwv )d(8xth the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal upuq,w019 h)myosl1n battery of constant terminal voltage. Al,sup owy)01numh q1 9t the 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 inducta 7p nehoy )g;mhtt,,3unce L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance Li-.qqq,mg fj 0 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 batter ;uj9y9qt daj8y. The time constant for the circuit represents the time required for the current tya89dtuj9 ; qjo 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 ar052oji j g0//hgww2 ad w)lbwxe connected in series to a battery. The battery is suddenly removed from the circuit. Thel0dg hoj 5j/0a)w 2/wxbwgw2i 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 sa3 .i)jkyxu a 8h24f86cvuj2zpifw k+nme 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 tg;c ca1h1 ih.ko an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the0vn5i1vv ns3jwox1 ,d curren x01n1wid53vsv,jon vt

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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 frequen(moyqkv jj/ 02cy is triplekvqyo0j2/ ( mjd?

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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 dou1azva3t6u ye2bled, the inductive reac621ya3e t uzavtance 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 inductblkpyvf0kz m 5h6s:8 lv)*u; for approaches zero, the inductive reactance of th68hvmyf* l z)5lpkb kvs0;:u fat 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. In2 sttt8 z 1jq9;dwo2jm;iepf0 this circuit, the currenmj8f;tds 20oz; jti wtqp12e 9t

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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 factorgc7:;9v )bocl3glxrvm+ ;8rge pp: ul when the frequency is tripl;oe+p:c8rbllm;vgr ugplx )v 7g:9c 3ed?

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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 adr sh 6b kc+r:oy ojs0(ki)8s:pproaches zero, the capacitive reactance of thaksr 0sdc:ij)h ok6 yo:bsr(+8t 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 b/od;. ,f wf;bow 8lvsin a RLC series circ8d; sbo/wbw lfo.;f,vuit?

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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+wg7/6nmii,q hki58g 2c-bckuxx *z p 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. Thii)j ;y9; z(d1xh xrmce impedance of the circuit increases if R increases. When rx )zd1;9; cmyiijx(his 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 impedmtv5 asj *cj)71 j2sxvance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedanl6 ,o7 lek8zxtce 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 b(;u cbi cwe)rnkh*m 9 n9ltc0+oth double in an LRC series circuit, the resonant frequency of that * bclwcr ctm9k09u+ ihn ;n)e(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 circui4 frxk/yva(v)t that is driven by an AC applied voltage. 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 0huos /9t rg6yRLC 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 fo i fba4 1,ln*i+su:asfij* :pield of 0.20 T. Find the magnetic flux throu+lnsa:, 1:oif** basfi4jupi gh the loop 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 rotati 7 mpw.il2lzd3ng in a uniform magnetic field of 0.20 T. Find the magnetic flpi7 l zm.d3lw2ux 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 radiuskixb.5vb yjn*y-b yy t5* h1;s 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux t5 s .xjtn-; vbh iy5bk*b1yyy*hrough the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional ar/ 2e; tnbq 5hohap7xc75p sch:ea of an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil chac kah3zov.vcbhrp45.n 0 2 7nynges 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 wm (vxzqj)6alzeg/5j jl5m0 r9 ire on a square frame with sides 18 cm. A mqaz (glj/5l5jv x0 69e mjrz)uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the 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 areu/:.w 7ioa gfia 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 ar//j7v4f d f g8fwwhp-rea $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m fl6 tac8+ etqta.ies horizontally at a location where the downward component of the Earth's magneti8 q.t6ate at+cc 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 ve/ tw2zr6,gy tplocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic, 6yp2/gwt ztr 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 area /3unxb y7zcc vs5a 1l0-vw n6sof $0.25 \; m^{2}$. 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 1*fn 8 19ez-cw vnqzq/x(hoyiof 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 armaturec*l ohxr30i 7q. 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 voltage of *0r il7qo chx3this 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 m1+yf/y q)qws100 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 with an owavikeru 7y9 8u ,qo*+utput of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T oaq*8y wireu9+k7vu,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 generatot vxy344xm-ry11vdj ur with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resista66x yj ssygp, /km,0pknce 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 moto50xz be)pw1:fpr lg3er have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed i1g 5:z0xp3pbl)refew t 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 ad: )mxwem; l+s 24-V power supply. The operating current is 1.0 A. What )wd sx:;+mem lis 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 cozdpql/y.*u7-4 h dbqh nnected to a 24-V power supply. The operating current is .uyq/zldh-d qb 47*hp1.0 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 intern,pqeu ) 1d1mnual resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is thpu)uq n 1,dme1e 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 isw:z:az *rl08vcgr y5m-z ng)n 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 causes3ikgjr3tt)66ngn uay/xb )3k 14 A to flow in the secondary. How many turns are in the sec )n/g6 yx363u jg rnt3ibkta)kondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the 24-7/k ezchis(3ai 4u5 soV secondary hassze 4uksi c7i5(o /3ha 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn e,;nqi.x q4swprimary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the pr iex;.n wqsq4,imary?

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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 transffu6arkduu 18h/ x ayn+*.px /gormer. Assuming 100% efficiency, how many am/rxdfyn uk*ph8 xau6/u 1+g.aps 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 :fn.( cy*g.ob*rsuaoneon sign transformer provides 7500 V at 10.0 mA. The primary coil operatbso*y*oc:. fguar(n . es 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 tr 40(y *:5qeukt *pflecx)cyiurns 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 secondap(*:rfic u lx4e0y kyq c*5t)ery?

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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 sechu.+ lq/b-y xoi4pj g9*un+w) f1sbkbondary coil. If 120 V at 2.0 A ib+kxnp u 9+/4 o. lbh) bqgiyu*w-sfj1s 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 seco-: maix p-1zrendary has 200 turns. If the input current at the primary ar-1i m-:x zpeis 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turnshdxi8 )* e(8e8xfqetd4z 1ebp and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output volta 8h*)ze8 xqxetpfeib4d18e ( dge 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.y7xnx:woas75crey4riz3q 2 5 If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictionaleq5yn7x3rya4s2 w zo ir7:5xc 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 vortgw1pcb,:,5rpxli1 8p (z;igqt q2sltage is usually stepped up to 4500 V by a transformer and t:pg i58, b; 1tzs lc1xp,(pr gq2wtqriransmitted 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. e6:fme pntfm(6hyl/3 The voltage is usually stepped up to 4500 V bt/ 6 nyfm:(heepf3m 6ly a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually s23p jln+ ehx63jxqlb 77ude +stepped 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 qh7+7 js+uxle b ep2x3jnl6d3transmission 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 resistance ofri.:ljbj3qo(o p5 c7o 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due .p3 ljoob57jr oqic:( 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 ( kpko7z5b ai650 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 1k7okz6b5(pa i00:1. 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+a.)ha,e0zwvvq8mvy m qtm/7 be lost if the power were transmitted at 30, v0vm8/q+mwmzq thve.) a y7a00 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 a/rhul . o:*sma8pjs 0transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not t.p: h* s/laj arom8us0o exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in the tlm+zbu . dc4(coil's magnetic fieldcz.d+ mb(4l ut?

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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 )7fr.um crws2.0-W resistor and an 18-H inductor. What is this c7).uwmr2s frcircuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the 2b/ c8ahybzobi 4k 0/vrms 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 the orh*zz50 l4z7m5eh c fpeak 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 12 0ybuenh/2*b)tn/ c2xcn, qov0-V AC outlet. What is the resistance of the lamp? *x v)cb20qhe to/nu2/yncn,b

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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 pb+5/g5p,w uhze4(yqarl+pn a 120-V ac power supply. What is the peak current th p u(h/lpr,wpz+e+q545ynabg rough 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 suppl(;/dc0pebj id fif 9-ly. What is the power dissipated in the residfc0;f e (/9diijlb-pstor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through kq nc5fe-pf0 8a 50-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 50-W resisteh(ni s m4f /c8:.utosor 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 res )7mn,a3;kprjzh d (n5ar gx+jistor 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-pg*-9yf k n; pqbt*6dzmH 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 at jsbd*9 *2scavpmg5n1j-ec k-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 14enkt;i (om1qzf1r21 mvt5g uk+6 lw 8e.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 in g9 8svxa(21e vb/erumductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 .ny wq.k.(aez kHz is applied to it.(nkyq. w.eaz?

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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 coil due to a 110-V, 60.0 Hz souas+q* jvrbr.1rce?

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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 reac um zok5crbz-3kg,0,a8la: c ctance of 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 of capacitive ry4(8gwh,zb yo eactance 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 reactr)xz3nd(g)mn 0w w)3pbjxcmyyg 0 t0*ance 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 capaciof1c qu.6 mqvc yj)6)ative reactance of a 0.010-mF capacitor be 100 W? jyf6.)qvm )1a occuq6

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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 5n+7foel 398sxkvcdx je xl2 -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 afb1h*w c wf,yt)3dysw07lxz 1 c series circuit with 12.0 W resistance, 15.0 W inductive reactance, and fd3btw0z,7y * hs1)fyx clww110.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100z u7 ov8d5tpbmk)d,d 123sjnm-W resistor, 20-mH coil, and 1.0-mF capacitor are connec j7 1vd38o 2),tznds5mmpdb kuted 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 atl u *g+(snf,at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seutla*s, f+n( gries?

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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 connecaaj8 o l34z,gg0ouvt; ted in series with a 20-mH inductor, what is the imped4jg0o 3v, u;lzgaa t8oance 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 4 k8xeq5pw/zvn .jfk 320-mH inductor, what is the p 5e. xzqv4kk3j wn/fp8hase 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 20v e;g 9k+7j :dpjqf3gdk/+sh w-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 Hz :sh+;v d3pe9+kq kjgdj/gfw7?

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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 capy04g;i6djigj lj .5ji acitances is needed in series with a 100-W resistor and 15-mH coil to get4i5dl 6i g;0jyij. gjj 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 be put in series with a 450-s 324 ab r1noek2du,qimH inductor at 5000 Hz for a total impedance of 40000 2 e3k4b,2iqdsnrou a 1W?

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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 a-6omde( h )(n2 cfshdseries with a 100-kW resistor at 1.0-MHz for a total impedance of 150a 2hf6-s(( cdh)dnoem 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- (u7vy5snz)yugsnr ;+mF capacitor. What is the imped+nuu(s)gz5 7rys; nyvance 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 sern.p 5 85i,guup5rizjsy8eh *aies with a 10-mF capacitor at 1.0 kHz for a total impedan*. 85 sa,ip5pg yn8uhez5juirce 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 1xwwj+ i )q867ffpx-v e0-mF capacitor at 1.0 kHz for a phase anglpxw)7 8evj i-+wqx 6ffe 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 ake /z8i gqq-j5)h h :-uke6lzo)z-mpt total impedanoqu ) imk--h zepkhqel/5 z z)-g:6j8tce 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 capac.r,3 cl/rp cow,su1 uxitor at 120 Hz. What is the phase angle? lsuu,.p/3r1orw ccx,

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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 10o4j+9nai 0ruvu90k yn0-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriev4u9 a9ku n0rjio+n0ys?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, and a 0hz2m aj)2g c4tpk +s0o.350-H inductor. The circuit is connected to a 120-V, 60-Hzo +h2mj2p t)kcszg0 a4 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 reactance 30 W, and an induch w(3opsxc1lp,2p xfjm,xh- 9tor of inductive rea2-xmxc 19hpfxs(3php j l,ow ,ctance 30 W are connected 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 reyq379-zhepv 39d qdr 7:bkio isistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to ae:r py3dbd k -o7z979q ivih3q 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 phase angle 3/ v,xu8qunq6ziw 3ojof ij8,n6uv zo33 wqx/qu$40^{\circ}$ 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 u4jl3rmsr+ ,v hl6j9fx3,x sxtta2-zhas R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from thetvsl,33jxsr, x- xlm jr 9tu64+fhaz2 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 circui5j ,+kp-alh5 yifs)jfyc8 uu;t with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W ca lip-u5hf)j5 f+scya uky;j8,pacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circ d-9u4bs.yj yruit 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 hcr+e 3aa*7bi20 k e/ob+av8 , wmmela-s otrb5as an impedance of 60 W and a resistance of 30 W. What is thera /e-,l25bt mov *ca0r ob+8ab+wikms7eea3 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 circuit c**6imbcn jhh m+v8)weontaining a 50-W resistor, a 10-mF capacitor,ij6mve*w*bm nh+ch8 ) 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 1.0-mF capacitor and a 15-mH coil in seri tfpjs:) a8o4bmm5l85,smp kok d*rs. es?*rmps b5d .sfj sma8:,k l4o)p8tm ko5

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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 iu6ixup3x;hk/ n series with a 4.7-mF capacitor for a resonant frequency of 10 u ip/kh6 x3ux;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 wicx7j4r hz* 1 ev i)bn(a;wxh0cth a 3.7-mH inductor for a resonant frequency of 1000hwc ;)a xbc1hj0n7r ze4ixv*( 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 serie1evzkz5ku8b7:jv5s- iagq,y luf3( fs with a 30-W resistor and a 40-mH coil if the resonanafq1 3 5ivuv5bjk(y kulz ez:8f-sg,7t frequency of the circuit is to be 1000 Hz?

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