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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 utbmy *09tr9u vwk-+ zare units of magnetic 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 inductiolvmbu0 enw37uo xoxso 0;;-lq4 o4.z dn 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 l u,rl1y2et v hc7j2nfqn w,2-eoops of wire in a coil produces what kind of change on ttlye vfq21 ,wn-r2njhe72,cu he induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire rg8 anxm1bai nc/:-m4produces what kind of change o4ab- air8nng mm/x :c1n 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 +3t ak auac,ibsr5m3r 46s0oion the induced b a,ka soc45a ur+mti6rs30 3i$emf$, 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 fie7(rrwrt 1 9rarld 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 direg c6gnsoozbbo/c.2cdf 1) 2hs,jgs26ction of an induced current in a conductor will be that which tends to produce whichg1) c62s ncg6f2ogo do,cs.sbh bjz/ 2 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 is held abo g.-2 g-ret35u ;p9iuil h zj6(gaossvve its center with its northzgva2sl;6t( iior35egp gu js9.--uh pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above u59 6ihnxn6.)xj p va-s.xahv its center with its north pole pointing down, and released. As it approaches thex9)i -x6hja n5.xpsun6 vha.v 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 m*fset-supqwj+7 mqrx/ 065u l agnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced cursl5pfum+6*tej/0q w-s x7 q urrent 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 lb fy8h a10eo:+9gtkyzd)b ae cv);rp4 evel table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the zk +g4vd9bb 8;eo1faht ) e) 0crpya:yfield 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 whery1hig zo7/v6 f3vb6wi-s0qsle the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of i zb6oi0 vlwvg /y 3s61s7qf-hthe 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 fv3dj*kkw * buot.q -5on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on-j fdwbo* *kt kq5.vu3 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 pole entering first. 5uva(u7lt: h v ki)pp( As the north pole enters the wire, the induced currenta v (ul(h5tk) i7uppv: 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 constant angular spee7p mjwace c4i+i )d5y 1)kzji/d about an axis whose direction can be varied. In a regida) ij1m iyk7c)c/54jp+e z iwon 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 rotated at constant angular spee(u3c4gqp 3ej hhqc * v.)cc9njd about an axis whose direction can be va4h.vn) j3gej3c*q( upccc 9qhried. 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.1v(rmo7koycy1f z1)c6 9zo1p z bq;ss
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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 go swm .)9te-ldm+ td,that 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 magnetie - 7hu3 i7c1fx:(fe s:9bfpcuejtys2 piu5.mc 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 direc),8 wd sqhorc,q, )khwtion) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement w q,)q h,wcho8)skrd,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 constsgmxgqq;za :;75dd5b h5wxa(p 1f(n r .h1fwkant 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 i6a9 e,4x4nev a/j fsbtransforms

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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 freqrcrr)(n8l+jj a0ugip2+dj.luency of tdujrrl++pjl ()ai0 r8c2nj .ghe $emf$ 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 dev+qq: chg1.azb8kaz12 be. yrvice 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 device t bv9o*t u*s d)4(ulsj2ewrg- khat

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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 secondackm. k m h5tl3jqd 1+e;fc(:ltry coil contains more loops than the primary coil then ijktl(fmhc3emdk;t c5.1+:lqt 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 t,q n84 bbd*m 7dfwn+pphan the secondary coil then *7+fmpwd,dbq pn48 nbit 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 inpzdcm2g5 qbkj g505qp5 ut

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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 ci pzrmt/k 92;)dewi-oo rcuit,

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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 c;fce;v (730 g :yuqwv6 sspxiin series to an ideal battery of constant termin6g 0 e; s;x3icyvc vp:fuq(sw7al voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connecteds :7 t8mctlmi1 in series to an ideal battery of constant terminal voltage. mc ti71lm8 :tsAt 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 inductance L and resistance R is conneckj4lrn6rld na 20 yp6jm5:o)d*edi 4sted 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 resistance R is connectedm0iju a)i+( mt 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 bat1 hm4xqtwbjy3)nb;w* g0ydx5 x(0m cotery. The time constant for the circuit represents the time requiretxxbo;j0ydw1hm*0bcy w xmg4q5)3 (nd 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 con - g3.4qioxo iuo7v0 a(qwenp8nected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents wx-oqgp384o .oi0n (qv i 7uaethe time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same )5/s8zh n2mb :jvcqrb 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. O+yls; 4fq7vd dn 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 cnq(rvt1knv;u/9ym5 to an AC power supply. In this circuit, the curren91(y5rmv nn;cu/ qktvt

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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 wwbddybr,*p, 561 9tiwipqi, yhen the frequency is triplp,1,d 6biw*dtpqy biw 5r iy9,ed?

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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 doubledpjmc 8qz 2xexl nfo h80u+1u71, the inductive re+1jpn7ohm8 q2xu1f cxl8 0z ueactance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, the indx 6vkd2g: x-u3mzxb9quctive reactance of gm6vx2b3x zq-x 9kdu: that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power s732g q1ey qlrcupply. In this circuit, the currentl1 2reqqcyg37

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactaner 4nez nw+0q.)z/ aws1 kban1ce in an ac circuit changes by what factor when the freque/.ek1z enwa0bn4z)1 +awq srnncy 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 voltage across a capacitor approaches zero, the ;m.p obx:4y3v)fdnrxcapacitive x3 4pb)dvx. :fmonr;yreactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle betweenh; k7gb.-z zsw the voltages of the inductor and capacitor in a RLCwh.z7z s gk;b- series 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 definedbt -p +bbh;xay, fejuph)nml ;i3;:1 f 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 the circuit increases if R increasesn( --e2r z6f fheaqgy). When is thi6qy( n-hz)afefg-2e rs 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. q,*0qagwhu,shc uu +0The impedance 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 i /:0eblqyoh3 kmpedance 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 doubo ok;mms 7* mkb:-a0lple in an LRC series circuit, the resonant frequency o om 7bks-m* p0klm:ao;f that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At reso 6xx6glid0./yt d:srowlbum l -,1z9 onance,

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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 RLj 7y:pugk j-k+C 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 uni9 io 2s.yxi)zpform magnetic field of 0.20 T. Fin o. y2izps9i)xd the magnetic flux through 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 rotating in a uniform mvh + 98+aqu:*sb 7tld(xsvjngv*pda9agnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vecv*h+antpvq*(d + 8djsavxlu99sb7g : tor are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0 txhwl)0*,ckb.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle ofx)hl* bck,t0w $30^{\circ}$.

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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 isj4:nyr hh ine:3 7)ccv 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 changes fro :r4:s4efk fhkm $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 c lmz e-,);m.kwcy4x rmm. 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 8mk zm.w-r l)m x,y;4ce.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 t5fgzz(qj/ -ms* ,tq adurns 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 kcfx 9:h8hak ,and 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 horizontaou)e8pl;0a bt cnyt +*lly at a location where the downward component of the Earth's magnetic f utn)0; yt+e*baocl8 pield 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 cont lgs35-ck 4qjstant angular velocity of 2.0 rad/s about45kq 3jc-tgs l 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 loopsk4 (l*a m2jwvu t+nn1m and a cross-sectional 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 1e.b egv:c 5l +47pdevm00 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. Ea q9 -2wl*eb8 (hhde .6il)ag lcvwosm6ch 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 ofwmql96d-wl ecgebl )h6s2* 8ha.o(iv this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire ofiydso-c; k*. ju84xm p 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 withu x17k1bi.6gah 1l tmk an output of 12 V maximx11ua hk16 kmbg i7.ltum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a gen fku n0ydq :*qer*rc( 4q,)vcherator 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 ha;idyh .pfg8: lve 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 of 65.dxdxu dz9/pf7n7 nw 8fw9go .00 W. The motor operates on 120 V AC, and when running at 5 97/npow9n7x8 d.u wzdgffxdfull speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W iofalh5 : mt3p+s connected to a 24-V power supply. The operating current is 1f+pmh to 35:la.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 internao2 wls z4; 26bc5cynzvl resistance 6.0 W is connected to a 24-V power supply. The opew4vo5bcl2scz6z;yn 2 rating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V powhpr/op94b b;0rd-wsq er supply. The operating current is 1.0 A at fullpo;dw 9rs -4qbhrb/ 0p 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 transforu j /z;ow/fxt)mer is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transfocppi) cp pw+em,8s0h5; d9utprmer causes 14 A to flow in the secondary. How many tur upd8 wpcp pp59);c,hse0t +mins 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 pr. nja. ;.dcw 5zhyci9wimary if the 24-V seconda i wh;yaw..5.ncjdc 9zry has 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 primary coil anrq d) zmmf4m43d a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the cumrf mzmd344)qrrent 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 prwfn:/ q;9yc erimary of a transformer. Assuming 100% efficiency, how many af /yenr 9w;c:qmps 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 provideiyhr1lg+ 9r-1f1n cx( kdqz9n s 7500 V at 10.0 mA. The primary coil operates on 91yxc1ngn lrq9r +(izfk-h1d 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its secoi7c.jrx7sfit4 ,9 by h20cflomqv ;n2ndary coil. If 120 V at 2.0 A is applied to the primary, what voltage vl7bnt 0 ffm2xi2 jh4c; . oyq7c9isr,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 2b.c y3qcls elx3n.5x0hl- afits primary coil and 300 turns on its secondall3-n xfs0 qxha.5ecc23b yl.ry coil. If 120 V at 2.0 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 seconuvtk ;c2 +z 0esbz2hsj6 *tmz;dary has 200 turns. If the input current at the primary is 100 A, we can expect the outpsbj scu v;t6e*zmt2;k+0hzz2ut current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary 51fjkf0fj iy8z44sxln z . d/phas 200 turns. If the input voltage to the primary is 100z4ydlkizjf/ .sxfp1 54 f8jn0 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 an9 lndew2y0 60x5fxe jsd its secondary has 200 turns. If the power input to the primary is 100 W, we can exnxs0w6 ef 9jdlx e02y5pect 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 vo4;.1 on5hg*) wmxrbqskvyyv 4ltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistan4kv.nhrg1my*vx 4 ws y;5oqb)ce 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 curre1v ms;o 7cwk8pf3lp; hcs+ii7 nt at 120 V. The voltage is usually stepped up to 4500 V by a transformer anh1c7p p ikcvo3;s +;l8f7wim sd 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 produces9 p-9f ljcliwhn/anu+ 8m3fi1 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 percentage power lost in the t-mclln9 3uiwhnjf/ f +p 1ai89ransmission 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 of hq5bon5ctzj*)hu;8 p6 y4 fof0.60 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 stepp f ohqbh*6jc f4pzy)n55o8 tu;ed up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A gek 3m 0c7kdkz3hju l41gnerator 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 energy is l7gc0 4m jkdku3lkz13host 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 pjcu1v7 l;84q co8fpvii+tk:down a 6-W line at 1000 V. How much less power would be lost if the power were transmjp cv+l1oui:c;8 8qiv p4f k7titted 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. k: wp tq5gvicd)+gi me8q87 x3It is to be transmitted on a line with7etckd8 iq )wig 5gm+px3vq:8 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 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 5.0bq75nyu;*dvg+h q ,bf A. How much energy is stored in the coil's magnetic fieldqngfb7 bhy,qv*u5;+d?

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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.q;t jbs-k0e:t What is this circe-tt;j s 0qk:buit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms volto,vawcde5hg9 sj-/x i 9ww 0d+age 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 xs- ml1vp n;v4 0k0 xqqf*v5jvis 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 outt,(b zxdrlt7ja*n) x0let. What is the resistance of the lamp*jd)xltrz na(bt, 7 x0?

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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 sus jh5r-eud8 cl3s8 dd)pply. What is the peak current 385c -dhrsj8d ue)d slthrough 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 is the pi-drm2knbr3c i0x 50 yower dissipated in the resistorr3 2i b5ndyxm-ik00c r?

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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 resh6tfv++e; w2 1 aiiyipistor 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 resistivc+biy8dd ql03 g1vo5lk 8b: or 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+ll+rnh4g2 o x resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 6tv j d-qvpjo //)ls2l-0 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 1000 Hztq 4kbb crn8s+sf) 7sva35p psjg0+k/ ?

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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 1ibn*iibe id9k. : *qg-b6rhiof 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 inductive reactanc8c9m +pgqn) fhtp3 6ube 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 innzwe- ef0)q m)taq( )x a 60-mH inductor when 120 V AC at a frequency of 20 kHz is appl)-t(qzxw)f0) eqm aneied 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 coil due to at; 3s,i-)swk d 9ctkal 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 cac7o .augd 2t4 :hfzj(zuj5m:dpacitor 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 4r+8p(g ixtzg k:k 5sliw w/z/of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance of 1200 Wj9fip7s/ me sy6eo 2:r?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a ,yar6z)qx8 jo 0.010-mF capacitor be 100 W)oxjar, zqy86 ?

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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 5fr6ypkuz;7j 0.0 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 an9/bjecb)lq 2zeiwket 7/q ;m0 :x5qqzr 8 ewj5 ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactanc t)lq/9 q5be;2:5ezimkr0 qczq e /w7e jxbjw8e?

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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 impeda(( yx) *bdcagence at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF cg caxeb)*y (d(apacitor 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, and 11jnazdmi1dj91ysb 7x a 9 d/agmfj:5/.0-mF capacitor are cnjdsgjmj//1 7ia9x: ma y1a 9dfzd 51bonnected 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 thepz : .1d tmlxn2f,w2no impedance at 1000 Hzw2f.2dz:p1tn l,mo xn?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, rtpb6 u84 2qt i-v6nzmwhat is the phase angle at 1000 Hz ztuvmbrp-t846i6q n2?

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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-miqa(dp(yj q-nto k9mgh7/53bF capacitor for a total impedance of 100 gm/hpkyioq3d- (5 jnbq9a(t 7W 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 i72-y6al. brkcasp 5u needed in series with a 100-W resistor and 15-mHai72lyp 6sa kc5 b.ur- coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a bhz9p jed*pufxxq7xx ,) +*u4jxj((e 450-mH inductor at 5000 Hz for a total impeda xxexd*,h+(9q j74upep)ubxxf( *jzjnce 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 1.0l o*l;kh )dk8ssy(a0u+bz x upd3;cdvxc5 7r6 -MHz for a total impedance of 1 +zc 8y) lv7(0dkrospsxbdl* ;3kcdauhx;65u50 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 ilv( ;nrq3 spe7( ,gw6y( floojmpedance at 1000 Hs ool q jgvn,f7ylr3(wp;(e(6z?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is nee s *;dsbsmip1c-g4 1t p;jddz2ded in series with a 10-mF capacitor at 1.0 kHz for a total impedan*d1sc;2z1 ;m ppdid4t- j gbssce of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 k.q.4x+h e eon .s;luqtHz for a phase ax.;o.hnqt seuq.+e4l ngle 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 3k mqj*52gbbc/yi/ )af 0-W resistor at 1.0 kHz for a total /qmb gbf j/a5y2ic) *kimpedance 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. Wwf0: . uf*tlwj(gla 2qwa8u z8hat is the phase anggq latwz*fa:08j (fuw u.l2w8le?

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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 b4x)fy;(grq) ks4 f*; pv,ik ye.qm jicoil, and 1.0-mF capacitor are conne s.xbq)*;y4;jqg4f,( yke iimkfp)vrcted 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-mF capacitor, and a 0d)s5hhl(; + 2mj 9sxysn8ep9 hh gk2.bgu fc2n.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the 2+e928k n us9h ggxhp ; 5dsbnh yfjmsc.l2(h)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 ren 6;s lpubrk .p+.q5vlactance 30 W, and an inductor of inductive reactance 30 W are unps+.;.6 prbqvkll5connected 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 tln*- tj 1f7q+;husqu series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz- ;quh ljt*ufq+t71ns 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 serh +zy hcnc i*b)*tb8 5d.,zfjeies with a 500-W resistor for a phase angle odtzh+h8ccnb )yj, z 5e b.f**if $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 muz, dk1d5e.r8a) fv2ay56 z iz,tkl xvF. At what frequency sikufa,yxdzdvr6 k)z5 5 8aetvzl,12 .hould the circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistngogz /nrt y3jz83, y(ance, 15.0 W inductive reactance, and 10.0 W capacitive reac(3y,g/8n r yg3ojtz nztance, 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 ci4pze-8 a,n a,6*a6q-8mrh gasosp,ul wx8i zlrcuit 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 hasz4srxcud4+x4v l*t+q an impedance of 60 W and a resistance of 30 W. What is the powecztr+qxu+ 44 x4*dvs lr 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 cbxr, k+ la3zmz-12p e+p5xpyfircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor,++1 zzrx l2xkppema- 5pyb3,f 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-mi; s k1yli, 7h +myr+.vvu;lutF capacitor and a 15-mH coil in series?i;7;,.umi r +t kyul +sh1yvlv

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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 capacbfa5nh33 rdau8 c / v-ohhav:.itor for a resonant frequency of 10 kHz-v3.u/ dar:ao b5a fv3 hc8hhn?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a6ua+ z/z 1l/cbe xx,vm 3.7-mH inductor for a resonant frequency of 1000 Hu+xa1/ cz x mv,6blz/ez?

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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 a 40-mH u)i.v65, t qp/wrtajscoil if the resonant frequency ofr 6q jpviu)./5, asttw the circuit is to be 1000 Hz?

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