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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magjwt0;wuml )eccp4y) xjhte 8.j 2- ddch:1j v;netic 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 sta h4, -nd*vndtgtes 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 coilu 9sg9d; .cf0hdn u75zsx9 feo produces what kind of change on the induced 9ffx.s07 5hsu ue99dd gnzo;c$emf$, 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 produc:vsq- knxv: cse-bes 9g(s-2uwa98 owes what kind of cho vsw9bcs-gesu w- 8:9: q- ask2x(venange 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 w6 *po/i0tekjpb l0ho2wfsc64 +wh yzj,0m,rrire produces what kind of change on the induc20w,hkpimzf p 0ow0 ey*h,c/ 6ot+ljr64brsjed $emf$, 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 removedj4ej o wue0a +4/7h utb+g6tf f(h5oed from a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductorex.ox5u-zfb)q yi k*2 will be that which tends to produce which of the following ef-oeukb .f52 iy*zxq)xfects?

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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 magnebio61fx f 5 feom,ts98t is held above its center with its norft9s5 obf,1of 8exm6ith 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 abovq.;5nakp ltb a w) .oyo.v2(nhe its center with its north pole pointing down, and released. As it approacheb2yvt)l..aqo;n 5n.p (k oha ws 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 rei57z1wc i3us1ab o ep5gion where the magnetic field vector points straig7z55pe11ubiw a3cs ioht up. The magnetic field vanishes suddenly. 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 level table top in a region where the magnetic fwxir ;fmu:-us -:q4lzield vector puz q:smlx- :4if;ur w-oints 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 magnetic f (u2zjp2eng : xvi9f-xield points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the fielzn:vjuei29-f px2gx( d 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 h5rc cvzalnfk(l.9lg1. p nt( /orizontal table and carries an ever-increasing current northward. Two coils of wire lie flattc.1( n/z(ln 5lfckl r .gv9pa 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 entering first. (lvfnas gph4p/ + 5jx3As the north pole enters ts vp45h g(nl afxpj+3/he 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 wirmo-k/*63plp p xe p4yme is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uymlo-mppk6 *4/x e3pp niform 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 aa1xj4sa * 6ggzxis whose direction can be varied. In a re1jxg6* 4sazgagion 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.thtq1dxksw,kcc l:(h(+2x mclq8g5 t,pf+; p
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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 a88u7 hsjrbar:o u: jm3n $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. s2)-oi (ls7qgzm,o ew 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 i .oaysb;, fkq1j; pv6an the east-west direction) is moved northward at constant velocity th soy6;kvbj. fp1aa, q;rough 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 b+6 / 47rnrushnbaz,e a constant 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 traho4ms) nr( y+dnsforms

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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 ugs3 91;aewe93 fmc +s;vmi*z z)mrlz 60 revolutions each second. The frequency of thrsa3;*swum39 lfc zmz1e9 z )i;evmg +e $emf$ 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 usexcdrr29h dwe )z5,le4bp o5 n(d 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 eqeaq+7qv bqi .) (s0c/mj40+tpnjq tthat

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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 coil contains more loops than the prikfetj9x7hph5-sj a rbm0q0e m9*5wm ;mary coil thentmwsmj-h5f07xk5 9j q mre9heab; p*0 it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops tgb/px uj8ds3, han the secondary coil then i /p,gdj3s bux8t 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 py5ndj(6yk )jsot(5 t power 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 ,ri5w0j-xc nws5, khwcircuit,

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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 connectec ks3/3m+ xpuoomz*+d,vd r a7d in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battez, soakxov 3u7+m*3+cdpmdr /ry, 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 connelv*-/b/+oo wr )1flsfr buna -cted in series to an ideal battery of constant terminal voltage. At the mulw /fr1abf-*bv sr-) loo /+noment 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 iie6 yhjpt c,v636x89 l5mwvfes 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 andnlmax7rbilxowr*n+95; k9 nnkw f 8w0 yn(;7f resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series .a mwq(s5cau3o.-r bato a battery. The time constant for the circuit represents the time required for the curcr b.o(.aqm 5 a-ua3swrent to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. ,e1-xwyi 8w,/f/dit ; bksw- ycccp,u The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to,y /kcf uc8 -/wx,1w -by ;sdecitiwp,

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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 samea wq* ey)16c9dhvd .jo 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 p)xw k4kbqqx,c4z c;;q ower 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. lg) o; 6qu29wrhaao;+ 6xgvse In this circuit, the currengq 6; saeo2)w9arh vo+6lgux;t

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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 whnzf1ha uykq8s8z 65jx ga f32.en the frequency is tripl8k q3yzf1a5hxf8.n szg26j a ued?

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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 thli. 23 .gvcbuxe AC voltage across an inductor is doubled, the inductive reactance of thu c vbgxi2.3l.at 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 approct/c;kcmf 8xyx (h h/j6l,j(t3vfq r6 aches zero, the inducmcc3fqxj6h8k ( ty,lf (r6c/ hx/j;vttive reactance of 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 supply. In hzi7r -gh- oj2this circuit, the currehirh-2go7z j -nt

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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 th 5nce m4uk8d33tmz-t ce frequency is tripled ck54uc t e3tz-m8d3nm?

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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, theu*w*1- .a.r )eslejpa+w 2o) rox.g3 vyeryov capacitive reactance of tha3pej svo .ryvxr-.e)y1aero)wlu*+gaw o2 *. t capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor any6 kk jh)isti::3e7 v76puc wid capacitor in a RLC series circuittih: w6vi uc3pkk)je7i:y7 s6 ?

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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 h z8w*fyro(vru38aj 0 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 th 4t4fgl/)jf(mol-rmr e circuit increases if R increases. When is this statement true?ot4r4 /mll )(-rjmfg f

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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 cki7mn icjp57i+ka(a5 ircuit 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 of the circuit increases 4mgq*d/ww 5p g*wm/o q1m emf6if $X_C$ 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 :j s (wba5y)nmqadzye/ze 3(8both double in an LRC series circuit, the resonant frequency of that circuit wijdsyywq5maa3 e (/)(zn :be 8zll

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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 Adralo.*us3u*w.1 y)o eei2 cdC 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 circuit og2i7ebe vf 6++nrwvl5t7-h keccurs 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 magnetic8tixz +w i)4/,nkkzf3 q2*2ixkw pzdm field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fielx 84tki wi+zm,2 kz*d2kfp/winzx3) qd 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- f;pr a87jdmo in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector p8r7o;fdjam- 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 unifoookqt e3firi;;j/ /626xi mftrm magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mf3qm6te 6j2t i/o i/ o;r;ikxfagnetic 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 am,bdta 6k*j 0cn 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 b6p6ou)+ bvnzfrom $4.0 \times 10^{-5} \; Wb$ 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 (do6ht1 anr4/x(zrg lpw y*b1nqqb: ; 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 aveobrq xn1yrgbq(l:* 16t n(p4h;z wa/drage value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns anku/ wa1zh, wu8d 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 azymz e 6ve;y p1c4 ddfw510nvsj,;e k:nd 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 hlb0 /* rrqmp7ur :1(uyxhq,s gorizontally at a location where the downward component of the Earth's01 7hxqlrrm,(bp ur/gsq yu :* 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 u/ ;ou )jdjj0fa constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in / j fuuj;odj0)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-sectionadt-nl orn gsd,50-z7l l 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 of wire i*:.7 ygbrp7- f 3t 8qfzsopkiof area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is l( ibc0,6l0ni9wz0)axf vf az12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to th0azilc0vwab9 6)lzx(fi0, nfe 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 ofi0-y x7l 06 3kffky/.cfybr wk 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 wijwxghx 1 5 89h6vqtch(th an output of 12 V maximum when rotated at 60 Hz8hhjv 6ct h qxg195wx(. 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 generator witl4fq8g0j m2 +jmb-xkfh 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 motor opex s0s v3)qy2njrates 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 6.00 W. The mot*0t6uaj9nq sp6f, k dtor operates on 120 V AC, jntf6 6ktaqs9,0dpu *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 6.0 W is connesyma l50ba*af+e n 75ccted to a 24-V power supply. The operating current is 1.0 A. What is the stb*0nm57yls cf5aeaa+ art-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected tnnyh bpa1+az:/l3c5 vo a 24-V power supply. The operatizna1+pync :/5 blh 3avng 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 rb(u p e2s,5hfresistance 6.0 W is connected to a 24-V power supply. The operating current is uferb2phs5(, 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 reduce +v9ftb- j yhdcgi0q-.suq dtvb 69-t 4g :brv,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 causesl -aw5p:msrn;3d sj : 5v6tlwn 14 A to flow in the secondary. How many turns p w:r-j;lnls5tv53 na s6w:md 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 ma5d(ljz0y2oqc c 3 j:i ;jgg;qbpfmf;/ny turns are necessary in a 110-V primary if the 24-V secondary has 100 o;yfplgm 3jgji(0c;b 52 : ;/qfqczdj 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 2o lm41k)agns ay; yo*of a 500-turn primary coil and a 2000-turn secondary coi4g;aokym)ol1sy * a2nl. If the current in the secondary is 3.0 A, what 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. Assuming 100% effix.j)*ag zn+bzj d). el3cyj(rut1ty, ciency, how many amps at 24 V can flow in czaj,n )t+yy.jjd( 1re3*z.b)x t lugthe 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 pro8 5ci/nr-phej vides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the pri5h8-eri n/c jpmary 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 300wj3(c,7qw sc.z ili) v.o58lkx d/yw z turns on its secondary coil. If 120 V at 2). cz53odw x8j w(qyciw/ks. l,ivl7 z.0 A is applied 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 mfl+zsr3 0r46c120fdvrx a*f s :v zskcoil and 300 turns on its secondary coil. If 120 V at 2.0 A i s msalz d4r+*x 3v1f6fs20r 0:zrvcfks 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 tra; 0kundvkz js/q67 .gpnsformer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current;7nkdg0. z6kpujq/ sv 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 20z p8oqt 7g rckg.(y uuc(8fx540 turns. If the input voltage to the primary is 100 V, we can expect fcxz(k4gu8r ucp5q(t. g 78oythe output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and i(x hg bd:)0: ciuxvafqatj0.+ts secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondarx 0 uvitb.g:0+dhafa:qj (c)xy 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 volt p** jmaf;mlkqzahpc/m. 364 aage is usually stepped up to 4500 V by a transformer and transmittedj4*c6*za/mf pl.kah3q; pa mm 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 voltage is usually )alzhk hgps0j)h *3x09n jw5ustepped up to 4500 V by a transformer and transmitted through a power line of total resistu ) nx35z9j)hps0 j0laghwhk*ance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usual 0q8 kafc68mxj0kopd3;jzor/ ly 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 if the voltage is no oxfd jzrm caq p/kj8ko03;086t 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 W. A:kjs0-lb oci zucuga p6xc r(,6 jo8xpz:w280 generator produces 100 V xjic0b: c ,x6az kspopljc6o80-(z g8 :wr2uuat 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 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 r3iqy(7c85hw(p*biy a ; et+pciuwac* esistance 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 t5 +7c(wq twi*uyapaiy;c(pe h8i*b 3c ransformer 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. k r13 s-vdrg6k How much less power would be lost if the power were trank-sd3 r vrkg16smitted 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 :xlcdugts26hgw 0)*s 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 l0s:w *)ugsth gx2dc6 the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energylw: a w+77jhub is stored in the coil's magnetic fieldljw:b7auh+w7 ?

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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. Wh;y kluqtx+p9zd6k(+n*ghtx 2*wd 1im pieb;7at is this circuit's time constahq;eylximd+ 1pub k w kn7igp92zd;(tx6 +**tnt?

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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 tkb xx 8gov bp9j19s.q/he 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 plac5kas,by c3ag, ed into a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance 1jqd 45l*qpchl9 fa1yof the lampcqyfa llq4dj 511*9ph?

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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 pnmx: vgc 6x3+uower supply. What is the peak current throughcx:xgn6u3m+ v 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 pow :.w4 )zj zrlv,vz6yiher dissipated in the resw6j. z,z hv) :yir4zvlistor?

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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 resistor irxpqthr. *j5tf2 b1j 1s $I = 0.80 \sin (240 t)$. 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 resistogtjtys4lm9 (d7im3 3 lr 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 oun8 xu9lvi9. +k.nqb 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 l q c (8;b0gaffwo7/3mw(gehea 1.0-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 reactance of a 2.50-mH kz s,pngdr, ate(p+ot55c*u 4edtc 72coil 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 l k,0 1v8.rw had. j8quxnd9wrW 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 necpe,m1 tn18vfqd wgg )-17dv:h: ui ykhessary for 157 W of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 kHz isi4jy.qw1z)7 e pnje0x a.j zj4pnwx7e1e) y0iqpplied 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 -cjw.*wqt. gzsp/xvb* i7u*g + z3thsthrough a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive re :ur erh0gt0cl:bwm3k+m h .a6actance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is z/hwjy52on4 jneeded 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 re qka1j goy2p2yuda:zr 1rhy94 8 l-b4eactance 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 capacitive react0 fiscc qta803(tls :hance of a 0.010-mF capacitor be 100 W?s8c hc fliq 0a:t0ts(3

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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 ceeqg9cn:ymz;eg( +xr 2cu+1uapacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an a2 utevwmv.y*(cfs5r 9c series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W cwv*ms2 9.ue5 ctr(vyfapacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH ch8fk 4; bkp(d6ij2s3 lwo+ixz oil, and 1.0-mF capacitor are connspb4d;jihk ok8 3fzw(+62 lxiected 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 1 cr(tqhy 5jbvq:v*i:*.0-mF capacitor are connected in serie*t(bjc5qv yr:: *q vhis?

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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 wi+i jp ait2d1*qth a 20-mH inductor, what is the impedance at 100patiqdj 2i1*+0 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 in i ttvfurq0 8kb1 ,d1t3o9oyr(7 pnys+ductor, what is the phase ao7u rto, 1q 8f+vryb(9y1t0t k3dinpsngle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil andfq2l ,ncz 5odm44 1rqd 1.0-mF capacitor for a total impedance of 100 W at 1500drnd1 oq2zf4, 54qc lm 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 a 100-W resistor n)/6awysux l3 and 15-mH coil to get a total impedance of 3 /a)unyxlsw6110 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 id9mqoy(5-gz*ex jwb7 cs.po 3nductor at 5000 Hz for a total impedance zp d.cqoxso-j7(5gm3w 9 be y*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 1.0-MHz for a b t;fr.y3uzn8 total imped8t; 3ru ynbzf.ance 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 cao7wz8wz 0h2vgi n6a3qpacitor. What is the impedance at 1000 Hz?2gvhz37n ao0w68qi wz

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is need hrfxt:i+ 0w0 sojiji:v9t,:aed in series with a 10-mF capacitor at 1.0 kHz for a total impjs90 aiv,wtot: +xhji irf0::edance 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 *p qrvxzc ac1gm;rs370,0 zkr with a 10-mF capacitor at 1.0 kHz for a phase angle o3rz cszak0 1v07gr* q r,;mpcxf $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHzdleww1r6 ml0j4,d ,mw06 bikvv0 v 1k2zpify) for a total impedance of 45 W?vb0ed2j f16 0vi , iv) d,rlw4pmwmwl6y 01kkz

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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- 7rvi fg (vu)cve20b:gmF capacitor at 120 Hz. What is the phase angle?brcig)7v v( v02:f ueg

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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 coil, and 1-3g z) vsu jl 5;;*dxr 5ol*eh-e5 vhmia.mtnu.0-mF capacitor are x gh;* ma*vo -;shnru v.i5zmed- 5tlelj5u3)connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-Wit+k/i v9j 0jt resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 1 tkijvi /09j+t20-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an i.pld3uvazx .zi 9*7ua nductor of induciva.a dzuzx*39l 7u.p tive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle forqt+ hts,wh(8h*wshk );q ck w0 a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when qhh sh 8k(w*) tcs;q+,kw t0whconnected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 5px5z u k3jh/t0/ kjsc. fpa/dgj-1at000-W resistor for a phase angle odth.j/g0-t0xj /s5c z1jp pk3 kua/aff $40^{\circ}$ 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 = -o7f(pfzlmicy c83.a200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving sourci7 ca38c- fl(.zoyp mfe?

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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 Wrppo5emi)t yj vb ;55: resistance, 15.0 W inductive reactance, and 10.0 W capacitive r re;5 i5:bpo5 vyjtm)peactance, 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 boz /-xdqbl 50AC 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. oe 4 xno(vj +6mt;*3f-n vanalg: df0l What is 0:amnv6j dfga 4n3fo+lo(;*et xlnv -the power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit *73xw luoaqb3 containing a 50-W resistor, a 10-mF capacitorx3ab7qo w3 ul*, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency w/kr j*s ip wsp4 816awo::wdbsg68uxof a 1.0-mF capacitor and a 15-mH coil in series?8ws:*ab g1w6 ijk6 r: owpssx/wp4 du8

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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 cu:wezz+r l8t f7n2zm 3apacitor for a resonant frequenczzl7mez wru+83 :2nf ty 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 inductor for a r 4qgjg .w0n)zpesonant frequency owg .)j04gqpznf 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 ipe.hf0e u2o*cvr5u9 ln series with a 30-W resistor and a 40-mH coil if the resonao5 l9re .phf* cuu0ev2nt frequency of the circuit is to be 1000 Hz?

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