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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 unit0 )dc ouggz4+abu b.u5s 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 induction statra vt,0c (px4oes 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 kind3wl (d1m4vjjgp:n2a k of change on the induced jvja3:n 4dgk ( ml12pw$emf$, 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 o p67 9qi.qkkt*p8uyt8r q os:of the magnetic field through a loop of wire produces what kindq 9t8ptqp*o7k8r ki :osuq.6y 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 diameter of a loop of wire produces what kind of change o2. xn) rw*6hu xlua)slks9j9pn the inducedarj *khuu 2 s)9l p)xxnw.96sl $emf$, 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 frobj7bat(3 b5u4a:qitq m 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, the direction of an inn ymze-,g x0i:duced current in a conductor will be that which tends to produie0 y,n:xz -gmce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet ww08 *x d0qbkvis held above its center with its north pole pointing down. The stationary magnet induces (when viek*08 dwvw 0xqbwed 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 ho0wl9fx uzn2 m;an8i4u rizontal table. A bar magnet is held above its center with its n i nnuw24fma;90l8xz uorth pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a regis9yygy7 p* qfe(pxc 1/e,g2 oqon where the magnetic field vector points straight up. The magnetic field vanishes e(,*g 7yyqxcoy1gf pep9 /s2qsuddenly. When 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 lemf8p25a y dbsw)9 wt;cb1lkh; vel table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above,ty5;b 8m9wsdblfp 2) ;h wack1 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 mag-wy):kk syw2 vnetic field points straight down. The magnetic field disappears suddenly. When view2-yv )s:kwyk wed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an everoj4 e5keli 44o-increasing current northward. Two coils of e 4ooekil5 44jwire 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 pole en:+wnt u+bl 9l9kzn ua,d d;** pwqha1ntering first. As the nlz*dd+*+:9 b1hw,q9a ;t naknuw lupnorth pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis 5md)y,sl sdda ,:e c3e*h+h mowhose cm, yas:+deed,d h*5 hs3) lmodirection 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 988meurg(j thd at constant angular speed about an axis whose direction can be varied. In a region whet (g8m9ehrju8re 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.0rctbx. wua* 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 an49pi hg 7 q37aoymq+hz $emf$ 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 mag f1;b4ckrmp ;wnetic 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 (orih5,lo 6o5xvsj k spzm:zff-416 gz1+ew*bxlwented in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concs+:x4ok s 6 zef156-pwzxlv 5jbg m*foz1,hlwerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velocitxn6l k q3aqy)lb+ (9zivr *o7ly $\omega$ 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 k/d,lyxhz(v/ /d0 /eiwq5- -etuussr transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates x cs(fo): dutac;6dd4 through 60 revolutions each second. The frequency of t s) 4;ccaudoxf:( ddt6he $emf$ 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 usikd8snw; wr9 9(uc7 lxi9ah+wt x4/lged 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 dlaz y4o*-gn55rzv0x b evice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary koy1o g .1nx6xhh 06vf3y s4twcoil contains more loops than the primary coil then it is an0. o1yvx366ow yxt fsgk1hh4

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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 secondary cy*wsq/r5 6;qgbg lqk8oil then ygq qb5w 6l;/qsgk8* rit 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 inputw 46e70 jj s2q 8cwvt,-dzdalw

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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 rmh5)k0xc oc k23od -b* md85vveokz7circuit,

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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 connek. ,ci2j0nzsu c 7il3xmh19kxcted in series to an ideal battery of constant terminal voltage. At the mo2ik 7 1m90xizsnuk.3,l ch xcjment 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 3 2q lm(td3 iw1aqdvq0are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, vq32 wqdq0m3ta1lid( 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 R8mboh+5rm y0:f a0, gqy9 wmgw 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 resistance R is connected to adr qr0cuk8q f0 hr3-c,f(sf5tn $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The ti*lqs-oqc bp+4k ypd tr (m)/u/me constant for the circui opmbqtd(qp cr4s/-y ul)+*/kt 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 -npv8oi.zds7*ng l8vt6zi ,r1aq m7j to a battery. The battery is suddenly removed from the circuit. The time constant for *pn g -lv78 tdsjrmvn i87ia, 6zoz1q.of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same unitd5dts) gg78t5 pbsd w8x2zj8ws 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 connectej d/ty.w(c(j,ig dgd c;a4a g*d to 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 circuitk7xgzij ;o3wpr(pc0)f jz2c-, the curren 0wropk)cp jc7j3izfg2- zx(;t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reacta2gu i7nsd-sc(j j7 h;knce in an ac circuit changes by what factor when the frequency is tripled2hjd u- k(7jinsc s;7g?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the indi2boawl/(qet xe, p1zw 4 f(5cuctive reactance4 xw a1z( b5q(2if,w/oeptce l 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 inx4d,)kbrtr4p ductive reactance of that coikxt4d)r4p ,rb l

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, the cr;; r5vj mnif,urrenrjfm5 ;,vrin ;t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit qaslq ( 24tak56z1 c6;wbo;xzwl:klh changes by what factor when the frequency is triple;waa;q6tcqkblxh1 :zl s 6(o2k4z 5lwd?

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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 ,cxogp :vrbo .+ul71s capacitive reactance of :ob +l,ug v s17ocrp.xthat 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 inductgv2wc b3o1h1u wzq 1p(- nowj0or and capacitor in a RLC series circu o(ojwgvcpzwq1 - nbu12w1h03it?

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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 as1a dvbza9qo3 :rk28kc $\cos M = R/Z$, 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*bg*okdrg6. * v158wf(e.mq eax nohl. The impedance of the circuit increases if R increases. When is this f8ax. vkd6gem b oq*n1e.loh 5r gw**(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 circuj0 9+alrif tkb7n4479s cxsoc it 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 impedance o2+i+uq q 7yzfc4zcp /kf 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 jpdvds lt*/z.7a)q3loth double in an LRC series circuit, the reso 7aj) *tslvqp/d.l z3dnant frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an A oh i7c.rw,(g m1:makrC 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 RLC cir k71c2.9b lj rb5mywekcuit 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 0f/p8: 8ddv xug.20 T. Fin8:pvdgufx8 d/d 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 magnetic field of 0.20 u2nzpmow) m:rx1wn0k (/p1, ubfvob. T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are per fbob1)kp:/ 1,u2pvrn(u wo0 x zmm.nwpendicular.

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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+;dgua0 )c0jhgfz*y o m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the gc a +0ho0dygu *)jz;fmagnetic 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 1a /)tu/ve5b4d.sayl 7 joeowarea 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 changes from.yz q7ky:+fp w $4.0 \times 10^{-5} \; Wb$ 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 swv9r+v 4vva 73)f zbujides 18 cm. A uniform magnetic field is applied perpendicular t+9 uarf7v3v vvbz4)jw o 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 wit)fj*0u kjp wd/h 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns w+ )w l5(ohdhnand area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a loco:8md5,t:0i aj 6bt fft.mrgfation where the downward component of the Earth's magnetic fitt .o rfb65f8m:adfgjt0:, mield 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 lo ik 9cwsb88b 50cto-c; 4tbnuhsk+wn8ng rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its5c onbsnt4bk-ktc 8 bw0c iw;+8hs 98u 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-sectionals 0b ;cdmv(on8qv)o d2- 4wdfx area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns ofgfl (.6z*dr(yx,h y tvl0o :u d5mpter;s3 -oq 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 loopuu2 mio.*ptnw j8ye; *gs,p.ta3bkq /s on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm aboutyws *tatg,/uie jp q8* .3bn.muko2;p 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 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 of )m74kw12t xp;--evvvb. h(m lvo sujq 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 output of 1/ q,v r;)be0pgk (bpjjcn4;wt2 V maximum when rotated at 60 Hz. A ma(etq0 kbp; jpnbw) v;r,4gj/cgnetic 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 11tzbsew4 m*jlcq h:3generator 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 resistance of 6.00 W. The motor4a)qo,cg u0i fn29t7sb-bfb-ih fa *r 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 md a; wyul8re-55 8hmvkotor have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a back emvrky8u5 ;85 w-alhd $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V powe0t-ff) d91h6z.po fz3khef rdr supply. The operating current is 1.0 A. What i -kpd.hd9rhf 6zt0e1fff 3oz)s 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 r6e:w r (pe0keresistance 6.0 W is connected to a 24-V power supply. The operating current is 1.6:epw0 erer(k 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 suppl7+qgwwd4ojs-k t7b j7y. The opeowt-s4 w 7jbgdq77k +jrating 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 e v37oiua* v,jyc7:qojyv0 4f needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to fl 3 est9cnfu40low in the secondary. How many turns are in fu4 30 9etncslthe 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 ;/ *nnzke1qmv turns are necessary in a 110-V primary if the 24-V secondary has 100 turn mz*1;/ envqnks?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of4nwc8 -,yz uxmzo5s5esf x wfu/.4do( a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the f/uyndo(s5wxwz co,sx -z5.f mue8 44primary?

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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 pri *jp*ho+jowl 0mary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the 0oh l+wj*j*o psecondary?

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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 tf ifs3g2-(uw b:xpcb -8 c-hspransformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V.:ip fs3 2-8wcgfu sx(b--h cpb 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 ith3d;svfm5z r-s primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied -szrh;v3fd 5m to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 tl1h41 baw 0wf1 x,bqdzurns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to t hlf14,0aw1x zbqdb w1he 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 zm7() )0 yv:eh z me(ropqyguwc.apvec(-1)j200 turns. If the input current at the primary is 100 A, we can expect the output curr c.vu-cz)p(e07(:ez qmgaom)e1p (hyv wjy)rent 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 has 2lo o oyx1k hv2xc/-ac0*r+0pp00 turns. If the input voltage to the primary is 100 V, we can expect the output voltage ofl ov/-oxhp yr0+0 *akco p1cx2 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 102z8-0b fv4 d msbd1izih3ar) g0 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the seb h2av)s40f - gbzd1iimd8 z3rcondary 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 6y- qmoxpl) k+k9 *y7kip,u5umt:t;kj0 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and tlpt ;u+j : kpty75 uxo kim,yk*q9m-k)ransmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The vo c llj2n;/0 tq -7vhdwrkuzvkpvtvh8m )h 2(78ltage 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 transmission line.th 7h/v duzv) vlmvq8r0;8j2-(k cn2k hlw tp7

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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 usuall0qph xs*q3;r8( ocnfe y stepped up to 4500 V*qh(f0ns q;exp cr83o by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistu et6 ppokvqlz5l,,y8l).; b lance 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 i,eyo6.)vl5bzqt l k;,lupp8 l s 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 liny 5c3urz1* r.rz+z zkte 50 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 100:1. What percentage of5uc ztr13z yz rzr+k*. 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 y;rw e6m kw5x*s u0.ra4b q0nhwould be lost if the power were transmi 5r r4khy*wsxqe;um6.aw0n0btted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It i0zhxm w uj4*4u, wzz-jow:b )gs to be transmitted 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 to zxg*wjubjw z4 )h0: zo,mwu4-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 3s au: -grdkx3t3xigt2uzx):much energy is stored in the coil's magx:2dsi uz3 a3rx xt:-3gg)k tunetic 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 inso ,r;,-8 cb3 nczx+mdc wx)byductor. What is this circuit'sc b 8)d3n x ,,xwc+omrc;bsy-z 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 inqal/ ko2qkfpa+3n 5 t; an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak currjdcxc1spp n**6ds*xh f b)0 76btk;wyent?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of i0 kz.v/czm1mmret 8pr0 *-o3v8j dnt the la8mt1 cpt08 0vdr.v /njmmz 3ko-zer*imp?

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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 tf:lq7 dgh1dbz /svv 9xf z8f9x27xju; o a 120-V ac power supply. What is the peak current8h 7 xb/u9vfldj7xdq 1g 9szx2v z;ff: through 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. 6+jjv 7 4+ ebg jbjoymvvk.9o, What is the power dissipated .v+ jbyevk7o6g9j jo4jvm+b, 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 *c klygtvu1m2u:v g(850-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 resistor a9 naf)djp;+ois $I = 0.80 \sin (240 t)$. 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 a0 -zkoho-g clu; 8fit)edm)-s 50-W 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 0k5y:8c 4rzj y3* u fztluje2i1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive xsc 0qrksbf*c l 8-*-yreactance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W)h x h0v u,wsj*,y-otu 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 inductive r- u6.h9,izne nrd :hxl1yji3t eactance 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-me-,)ez du0g 5baq2 xguo te+o,H inductor when 120 V AC at a frequency of 20 kHz is app0 gue2, - )eo,qg+auedtzo5bxlied 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 a 110-V, 60.0 Hz jx4em /t(j))gs5pkd o 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 y;bj9 4y /dxf.nwkao)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 nef/mc p;3uqs 1b+tm.nqaq bb45 eded to have 50 W 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 12004 bbzlo6- ogz/z8 vod.xe+*ie 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 c/09jm)he (nj96 xjikjffjk/qj 8 lq)s apacitive reactance of a 0.010-mF capacitor be 100 Wj/jqme(9x)f) k jjk9f6lj in0 sh8q/j?

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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 capacitrnu l0e91ogm2i d*x17;jcjx hap7o ; cor 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 anejq 4t *(5ckgquy:-gn ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactckyu:q* etqg5g n4 (j-ance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-m4hwi2aryx;i4v 8j .egj ms3a )H coil, and 1.0-my .wj8r4j;2x)ai3svg mih4ae F capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase anglex wta0r./vm -vgtx)1z at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are 1 a0r-/gwz.xv)mt vxtconnected 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 seu7 xph3sl/qoucw j/x1tf5 ;v9ries with a 20-mH inductor, what is the ih95/q/wx7t flo p uu;s 3c1jxvmpedance 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 )e 5a3efzv4cbcb1r0pyhn/ 5g with a 20-mH inductor, what is the phase angl554pbzfrhagcyv1)nbc30/ eee 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 wu(c- ey 2mt/cnith a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at nctecu- 2m/(y1500 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 camba+ cf t-6e2zpacitances is needed in series with a 100-W resistor and 15-mH cotaf c-z6+b em2il 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 sel;(zch*f46yljz ci;l;*ga+zo oq kp.ries with a 450-mH inductor at 5000 Hz for a total impedance ofq .z* co*gkz6 4+jcai;ylfh zpl(;ol; 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 putzk 24n;p4w mbl in series with a 100-kW resistor at 1.0-MHz for a total i 2lbpkn4wm4z; mpedance 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. Whacxr2t7t 4gr 3gl4n+nst is the impedance at 1000 tg2rl r +3gnntcs44 x7Hz?

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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 xa g/fo5p ,ds au)+.jz+0besccapacitor at 1.0 kHz for a total impedbp/.oagxe) z sas,+ 5fj+0 ucdance 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..:xj.1/db eqf4 xvu-k3chad a0 kHz for a phase4:h/3b1x xc fka- .adjq.u vde angle 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 resi(64p1 s 9ytufk/ff (wtj 1ypatstor at 1.0 kHz for a total / w6yfppt1(au y91 f4(tsjtf 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 capacit t :xk:ptysup*old/:4 or at 120 Hz. What is the phay xkt:p:l:4stuo /d* pse 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 *3v8gh-dn ylirm( h**klxp7pwh 7 p.presistor, 20-mH coil, and 1.0-mxpy7kl- .*wm* h7vrh* 8g l 3ip(dnphpF capacitor 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 ofz)9n u5, myc 6ihnok/e a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current inh)6/nemok9nc u, 5zyi 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, f6.dc9 3 :vfvf w d:m2+hvjbdnand an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What curdddvj 6 w93vv . fmn:ff:c2hb+rent 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 resizo0)0 qqfhzoe4) tc:dstor, a 10-mF f)o0qq0ez4 ) cho:dztcapacitor, 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 s2,z2n *ic.m-lrk bspa 500-W resistor for a phase angle of *2. kb-r2 iplsncs, mz$40^{\circ}$ 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 turu5m) -f n,rW, L = 200-mH, C = 10.0 mF. At what frequency should the cin ur5) -,tfmrurcuit 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 i dgc 4rwyuew/3448kks n an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, whenyrk dw84e/s43kg uc w4 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 circu /mq1:ban aw j(ae, oxvy0+ec*it is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of cgni9d;-;w t,b i )r9w-znyoy 30 W. What is the power 9 o yc;-b-w) dwn,gi ntz;r9iyfactor?

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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 tk74)vupm1sua series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H induct4t7pum)ks 1vu or, 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 hb:nb5f2l- 5bkh5rkzke c1,k in series?h:kk 5,bc5nekb lzb1r5kh2f -

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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 wix1z8lk5 it * z)gzp1dlth a 4.7-mF capacitor for a resonant frequency of 10 kp)tx zkgdl i1z*l8 15zHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-m3w;n ue)m 2 rgicv+ym)H inductor for a resonant frequency o3; cviu2+)r nw)y mmegf 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in seric7j;8pk 4bgyf es with a 30-W resistor and a 40-mH co; 7jfb 84ygckpil if the resonant frequency of the circuit is to be 1000 Hz?

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