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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 + av8hxg. x2bnunits 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 inductionl ))3o.l-jrs rnv8gwqln0 6t b 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 ipxb0/ sn;jwh*2h j +,tybfz7a coil produces what kind of change on the induced i*j, yj+zxn20hb/t sb pwhf7 ;$emf$, 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 th5 4c, i/yahx ctsiv,pgl/f*z(rough a loop of wire produces what kind of change on the induce/ zyi cat,*vlg /s(hxp4cf5i,d $emf$, 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 ovq0u49/)kyyzw jz y9ct6xiy( n the inducy4z9i wz)kvy 0/yt96cuqy (jxed $emf$, 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 ae kvqn;t s/b- s8xr3i; 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 dixc 0iv4p: u7*:ioyu slrection of an induced current in a conductor will be that w lu ivu:isc07 oy4px*:hich tends to produce 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 is held above (q.0i l*isg0ca d i 2)wxhui)xits center with its north pole pointing down. The stationary magne0qgc la2.d0) xxsi(h u)*wiiit 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 s4a)dj;3du+ef (pgtc held above its center with its north pole pointing down, and released. As it approaches the coil, the falling dpg()se;3utajf4dc + 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 . 9q2w kqw 0su j rihtt8*h/rcm9+hhd5top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When vh 2w9/hhhtqtkjwucsi0rm.9r *d5 +q8iewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table 9lpd4s..goo gs:oi4 o top in a region where the magnetic field vector polo 944o:. .dsso pgigoints 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 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 magnetjq9:xqa8 .)i knb+wkr ic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current 8bir .kkj)nqx:q+9w ain 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 carri3qh: e/ rdaya*es an ever-increasing current northward. Two coils of wire lie flat on t/r3y* a h:adqehe 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. A:mlyp1cr ,v u+s the north pole enters the wire, the induced current will be (as viewed from abom,+1ypl uvrc:ve)

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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 constqgo+x6 ia7sx-itp(bp -:eh :b ant angular speed about an axis whose direction can be varied. In a reapboi-bhxe- gipt:x 67+:(qsgion 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 speed about an axis whose e yg86hvl*3ct direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop*3 tyvc86ghel'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.bh cj6(olk3a *
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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 ybgqnyqdb*yy.q4:2mt e4 +7lprwr (-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 mag7x,- jgqwf5r gnetic 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 eaa1a9;hlvykw( st-west direction) is moved northward at constant velov a(;l a1wy9khcity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant an.i(tdy 8k8tkm gular 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 j, 4x1 wcdlh-,*b0 dfvjl2ldg;7.t oh zsa:or 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 rotgeuax9g t9x g0;m; w8b*wp3xyates through 60 revolutions each second. The frequency of theg *08ax9tb y3ww mxugp9 ;;egx $emf$ 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 usedxvsj ,jt/i6b ;s-1 uotq1eay9 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 deh 4trdv32;8vwr :q 8gnq.gzu uvice 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 they bdgfeh:9 i6h+* +zum secondary coil contains more loops than the primary coil then i d: +e9+ mfh6byizgh*ut is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secondary kzej9(co -hbppsn*71 coil then it is ak(-cj op*sp h9e1z b7n

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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 *(q mrjvg/0j2lqs7he input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circui.,uth lshe:(mot9ck h s; n96ut,

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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 in series to an ideal batthssmx3+:rwpb)1 url 0c vp15w ery of constans c5lxpu1bsp r:+whm3vrw )1 0t terminal 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 connected in series to an ideal battery of cvc*99afw.+vg)t/i :bs z m8tld fzim* onstant terminal voltage. At the moment t**as ilif9gc t) fvdm.+bvwzm/ 8z:9contact 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 resilpnx ljd7tco+ 1f (c64stance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to z7tcuk/7 ,vue -wo,e lan $emf$. 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 sepm6ld ontw:k9u(fz:*ix aycq 0e,(v-ries to a battery. The time constant for the circuit represents the time required for t eoz0w (vy9k* (iq-:tdx6am :f, lncpuhe 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 connectea ,pu t:2h9xh4rxftt,1i c;sb d in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decreab situxrc9a ,2hp:14t;f ,thxse 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 sam;ewf.*l cljb *e 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 to6/(ta3w94xzzyi / i vxqun2yp 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 3mv5mt gi b/8g9i 6hospower supply. In this circuit, the curren5t8 m 3sh69imbg i/ovgt

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance-q:ocr n jwx-x;g*wc / in an ac circuit changes by what factor when the frequency isjcq c-o wnr:gx/;x*- w tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, t9tg9k 1-g*)m:l+grazfhi oofxrk8k 8 he inductive reactance of tha m+* grzg9k98-hffa ot8kol)1xk rgi:t 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 approapa-9yu-r 6pk dhj0x1m4e,tbsv sn1zu( j37 vfches zero, the inductive reactance of thj jy91vxrfazu-vsd p e6 mph3u( -47b0,n1ktsat 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. In this circuit, qen y(jmd*0c,b)u:n tthe curremc (,edtb jn*)0:ynu qnt

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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 factor when theqi( gs,v*1wqq frequency isi*svwq q1(, qg 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 zneq(* cwtd6nq43m 9 la capacitor approaches zero, the capacitive reactanc* ed64n(wt3clmqq nz9e 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 betw(r(5h3dpv9suy zvwzw h: *z-l een the voltages of the inductor and capacitor in a RLC s5 hzwzs r:vd lypu9vzh*(3 w-(eries 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 azpjv2nw5vf* x 2v g*.jwf78t RLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circui5r d;bgdq g/g7t increases if R increases. When is this statement5dggqgb;r7/ d true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases ifouh)vg x+zvd; ::*:gqf rv bbft-: jq5 $X_L$ 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 circui27s puj3 m7fbdt. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitane rw 0,n2l)nxv8th9 8egcd a*mce both double in an LRC series circuit, the resonant frequency of that circu en8d*hnr,90lx2weam )gc v t8it 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 res :vjqw:( nxdcza8tkb+w. k,a0onance,

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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 Rwggss1r9 d e *c/69ojeLC 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 hmbskj o 93.+ris rotating in a uniform magnetic field of 0.20 T. Fin+msrjb9 kh3o.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 unifor6ixl9vhof15 nm magnetic field of 0.20 T. Find the magnetic flux through the loop when the planh5xn 9v1l foi6e 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 radius 0.10 m is rotating in a uniform magnetic field of 0.z52 cxg5n 5wlr7s kol220 T. Find the magnetic flux through the lool7l 22xzgsr5 cnk o5w5p 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 area of an adjustable single loop is r;btbf:+r ranmf bzz7r *mm m)u0n8.9r educed 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 chn :vmup6)wuw/ow 03nnanges 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 tu+ /de 6c1ftv sv7n3d+ 3acbeharns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of d3v3e/s6+ ah1e7tfd+n cavbcthe 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 ar rify03r+ s: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 and areasr.qx z:k96vgz,fc i 9q/; vsu $0.20 \; m^{2}$ 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 azp)i( bh vw9p e5qw/ng7q,mf7t a location where the down7gi5w qefh(p z wb,np9 m/7)vqward component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant anrk62 noo;y c(6:pofkpgular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a2kc o ;p6k:oy6pno( fr 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 generar0;8p 74bzqf3lwocq wk d(+f stlc4+stor has 50 loops 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 consin5zhp4n n8z w,sts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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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 loopshvan n tnnw63;yn6f5(w3* ovp on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axi5p3*ftv a(oynnwn6 3n 6; hvnws 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 consist. jgfjfs(z- /y7vjj (ts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator withy l*w1.tpe l ,1-.neldsz0mdh an output of 12 V maximum when rotatewhe*1p1. ,-l lz.leddms0yt nd 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 bvj :nk7ycg-m /fv.*wgenerator 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 1hr z38 vjuk2n da9*ixmotor have a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC mot mz7bpab-*aw uxy n 848*bti,xor have a resistance of 6.00 W. The motor operates on 120 V A8yawmzb*ux-ta b8,i7x 4p* b nC, and when running at full 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.)ft, qxi.dr55 ckf c3q0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up currentk5q.fr5t x)3icf,c dq?

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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 Wsbgdglmn7ha799b+ m9 is connected to a 24-V power supply. The operating cur9sml+mang9b79bd7 hgrent 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 power supply.ruzaa g r.va3ocm(9w5 i+4dm+ Thez3v5iro.(mca4a+wda9rm ug + operating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to 7pva-7n6c bd nreduce 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 c)gw5f l5dyq8s auses 14 A to flow in the secondarf5 qwldy)sg58y. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if t/k e+boktsm; .he 24-V secondary has 100 tk/tes.+km ;bo urns?

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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 cor 5*3dtn*ib xkil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what tn**5ikbx3d r is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assumi,1eh7iwo e :htng 100% efficiency, how many amps at 24 V can flow in the sec 1h,7:et hoiweondary?

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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 transf (9j ac(z*hgncormer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does(gj a9* czh(nc 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 turnj 7w:mgxoa1eacl8 cfrj9-3n(s on its secondary coil. If 120 V at 2.0 A is c7g-n 19xf (cwe:m8al3orjjaapplied 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 turns on its primary coil andusfr(f aun8apji :dm83(+ pdwf9j9 m3 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what curds :df p(jr339nma8fuuw(p+ ifj9am 8rent is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. ue0o.3 ypgz;r If the input current at the priz0yeg 3.r;pu omary is 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 turns and its secondbd/pltq-vb pa9 u, ymq4p;*t;ary has 200 turns. If the input voltage to the primary is 100 V, we can expect the outpu9bt-bqy4dp *v/ltq;ppa; um , t voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 2 /+ mf8zacels+,ejt2v 5a hdrturns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (ne+e+ jfzeha25/c sl 2at,mrdv8 glecting 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 120ffre9f68 cws :wt wwlvt+4,l( V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of +ww4( f:wet96v swt rc8f,llftotal 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 voltage is usualx 1l+koc dx. oyt:kjx2x p 54e;)tfig5ly stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Findo p41g y5xl+ex:j5o)xdtck2fti ;k.x 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 k3 bn7 yxv9h+ hjcbmxfc1tb w7g fa .6ls11.1nat 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 lobbf7x fv9ht17mh1 k+1a6nscb3.jlyxgn. c w1st 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 resistance of 0.60 Wodny9q)bl92gih : k*z . A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of tqh9 nyk:) glbdoz*9i 2he transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. vyre *onvunt4587sgfy 3cn82 A generator produces 100 V at 70 A. In order to reduce energy loss due to he5ey sfv 4u3on8nv82 t7n* gcryating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How mub23c oehl29 jsch less power would be lost if the psl22h3 jc 9obeower were transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a line n:9o5o0wc je5 *y(7lcsq goqrwith 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%(e 0rgoyo5q9js 57w*q :cn col 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 4krk3o mjc93hm y;vn6much energy is stored in the coil's magnetic fie; 3 vhmnyj 4k36cmo9rkld?

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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 rebr bh5pfxm:/pla * ebo h):3/wsistor and an 18-H inductor. What is this circuit's be/ox :wb5*: fpap)hh/ r3bmltime 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 gmctpur: u wvb,+c0:;in 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 curreniww9:.8/h47m zhknktrk g w7z t?

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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 resi m7 9i:f)4hm pfb4nzj rrp6/bzstance of the lampmnrz:bp9i b4 pfmrh 7/ 64jz)f?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is7vf0ic oi j;u2 the peak current thr i2;f 0vo7iujcough 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 powei+cuy62*d.eq31zrh 8e ddyg nr dissipated in the resi 1ye un 683dgrdq*h2d e+zyci.stor?

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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 resi we2*wtmxrk1 -)sa*yl stor 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 b elj,s902 d./htqji rsn/ f4s50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resibs8 w)zgc/1ps-j iqe lem-14 jstor 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 in 27dlby2phl3gductor 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 8p14aw gy p/-+mmmv th1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of in44diee 2 lfhfm .a)+hlductive 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 iw5z/qpu1; 0 soob9n lznductive 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 inductorau.9*bnriha g-3 4lfe when 120 V AC at a frequency of 20 kHz is applied to.ug-l3 *eaf 9abn4rhi 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-uz :b02,s; ot lgmijg1mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capa(b*j i(bbz0zhs0 0 rygcitor 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 reactance at 10 kpxatbn;vl 99 hx9 /l.uHz?

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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 lhnww).,4np;ys j+lr have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the cor6n. +fjla9 capacitive reactance of a 0.010-mF capacitor be 100 W?+r .f6j 9aocln

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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 5.0 f tm79zth(q*qV?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circui s,f*puyho4muku 87b-t with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacm8yu- kpfhb*ous47 ,uitive 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 Hzjt2cr3doc/ s( if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are r/2ts3(jc odcconnected 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,:syx12a5 g- eiicd.jx 20-mH coil, and 1.0-mF capacitor arecade s j 2.-x1iy5gix: connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is tdal+ch:w, tn7( :nw8( rkzpbqhe impedance at 10qclknn8 +w7 (pzbdr ,aw:th(:00 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 20-mH inductor,8- cv5b3gvn 8 wljr zic:b*)ql what is the phase angle -nc8i8wlc 5zrvv) q* jb3gbl:at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mc 2, txzz/o 6;agpft i+4j 7+uv)ygejdH coil and 1.0-mF capacitor for a totzxedvyotf6gp 47 a2),;jztij+/+ gc ual impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with aig 0 b-: )ynghbm +9zz3as3gup 100-W resistor and 15-mH coil to get a total impedance of 110a30n zipgu+ 9b)g :hbmy- 3zgs 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-mH inductor at 5000 i7kot y- zl;*vdalz.b -o,/bqx7 e2a rHz for a total impedance o -qrdb-x2b,zl7y/te o lav7azk. ;*i 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 a/*xic14m)gnd b,uzr 1.0-MHz for a total impedance nm,4b/x1az i*dr gu)cof 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-mFy6ln e a36-r rfbey9z+66fcc :)qqhb o capacitor. What is the impedance b6yqz3-a9 +cb6ey f6oqfecrl:r) h6nat 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacith: 6yc w+p:heu,d4ibl/m2x kp or at 1.0 kHz for a total impei/mchu wh2l+ :ey4b k6px p:,ddance 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 wc+r)f zoyt )detv3,; at 1.0 kHz for a phase anglef;,o+zt) 3dtye)cv w r 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.o i)4m +a-afksk ,iqh,0 kHz for a total impedanm-s f+ia,ki4,) oqkh ace 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 capaci55his 0,ls wemkb9( qftor at 120 Hz. What is the phase anhw f095(iskq l,mbes 5gle?

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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, 2chppnl/ y:4(ah /zk9vw6ftk00-mH coil, and 1.0-mF capacitor are connected in se /aw6k(90pvtzh pc/f4klyh :n ries?

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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,cw-un6 ;33cup e, rkbf and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply.cue,c ubk 6rp f-n3;3w 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, //xdiurv-. pu a capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a-x /uu.prvi/d 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 fo3wlyx: / ;d0nfwhks i 24i6pkmr a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, aswh3mlkw0i6np ky i4/;: xf2dnd 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 2 clm y6pjm1a-series with a 500-W resistor for a phase angle of 216cjlymp-m a $40^{\circ}$ 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 mF. At 4-hxy2v ap1;a wf,nry5 rkra* what frequency shouldra1,4anhr-2 v f*5r pwk;ayxy 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 series4a,mepzu +z.1kgfo fav. hn+ 0 circuit with 12.0 W resistance, 15.0 W inductive rea, k04 +hzfa+u1m. gvnea.fpzoctance, and 10.0 W capacitive 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 alc 9)(w: nv i8s 82 fos7rj1edvjetbw8n AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. Whfw5mko5av)jja,i /:dat is the poj5: 5ia,f w/j)vdkamower 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 contf;-awpp0c, a kaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supplw ;-a,c pkf0pay?

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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 a5*dvyyvi a.),y dc.m vnd a 15-mH coil in series?d)iyav.,vc5dm yy * v.

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor for aogf,t*+ucejz. u.r7 n resonant frequencyuuco ..rt 7j fgen+*z, of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH induc43sapgk8sht2 tor for a resonant frequ3k hsapsgt284ency of 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 series with evs rj5 , lzy, xhs1s/v,a-r1qu5e d4r: y-qica 30-W resistor and a 40-mH coil if the resonant frequ, qse -1 z,ye/cvr,xyhlsqi :-s1 vr r54ujad5ency of the circuit is to be 1000 Hz?

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