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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 bwlez.pb3md8/q,mpfw iw-b 5 6ixb12 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 sz ut -qe;8nnv7tates 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 wfxm- g8:tl m3ma/jvdg0.zc7v hat kind of change on the induta7: jmdm-.zc 8gl3xfvgm 0/v ced $emf$, 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 fie7 * / vmzgam2yty-ijx34l/ hxsld through a loop of wire produces what kind of change o4 /x7 ygl yjmvih-*/t3zx2asmn the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on thlcum+km4uvci9qe 0zo: mm8)r;hs3 z .e induced z;mm e4l0rzqc8sh3 u+c9ovi.):umkm$emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic fiekaz,- i1 uco*mld 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 induo2 dgn20dcnobnu+, uym*85 h kced current in a conductor will be that which tends nh8uy 2kd*nnubo,do0+52mg c 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 horiz;7d d7:h;xivu pfot 1gontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (vdhgx17dput 7: fo;;iwhen 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 mnkr75uwm+ns; sbabwxq b0), 2 agnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falli asq7, +nx0 u2rbbn);wbmkw 5sng magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic um.fvbjcex 6.9)r ;fzq b- pgyk0 ow:*nx8rm/ field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this co;.bmxcm 8bfn0xqok/ g:6uv rr*yf. p wz)e-j9il 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 magnetp q8k h6a8zqb-ic field vector points straight up. The magnetic field suddenly grows strok8 qhaq6p -b8znger. 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 wherk5jn*ez0b u l6e the magnetic field points straight down. The magnetic field disappears suddenly. When viewn b06ujlz5 *eked 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 ever-incrnfp7 6*9 q2bq6 cionoxlf wc gur+;k-+easing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from abfrf6 ;nwn*9o 7lgi6kc-xb 2oq++c upqove, 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 (/8sj 4 kzlbhzfirst. As the north pole enters the wire, the induced current will be (as viewlj4sbk (hz z8/ed 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 ai o v-:crqw4z oha+y;8t constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orien+worq4i;8 zhoy- c v:atation 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 aboutkgf6a,i u tn7m2e4so.8q+4n,agxzja an axis whose direction 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 ,tx6nzguaioka.eq+4mj8 4an7g2f , s$emf$ 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.+wgz ,senjol)lh ;:s9
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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 r r2yh45jna:yb4bt lpb 5 gw05an $emf$ 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 magnetiauc 58mk )8 .fetp/ar6hhc kjsr0b/c(c 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 wlo(k3y gh7 nz0h2z)yt k+5qyin the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potentiaz 2wh lyy3qgh7yzotk+n k0(5)l 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 )/ko5 *7gh,y o5y wp:ubk)wgdk;a gxz 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 transfbbt2r(eutf5d) l df+cl( 6 tr)70bhdy orms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. T +ads6w5ff, njhe frequency of the sfwf+6 d5jn,a$emf$ 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 used ton06k3re*tbc u

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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 devicefe;; k6uv6 fflc6r7 mu 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 coil contains more loops than the primasmuk)0/ oda 2kry coil then it i) k o02/aumkdss 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 kbae;nfh f3+ q. d6u6 5fi ;aeooebh93than the secondary coio aef;6 kho6u3 db9fbf enai3q.5;h+e l then it 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 inpujv46o:efue 6s t

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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 resonak08ll ab5olt*nt circuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal ba++qgfeadasm)muc.s: -e( q y:ttery of constant teg seqmc+:)(m y+.d:-esf q auarminal 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 con96+hb5ukwm trnected in series to an ideal battery of constant te 5rw6kbt9u h+mrminal voltage. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is *r i f)p0od*tdl:joy* 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 lq .g sinq.yoqo)+ 8c u:5d1esq5:q qyis connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to avc1gwi(.kl j4j,- mkw5afx9c battery. The time constant for the circ. w-(gv,ml xc4k5i9 afwkj 1jcuit 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 to a battery. *5-yp6n 2 av+moluf qmThe battery is suddenly removed from the circuit. The time constant for of the circuitv-6 25lu +o*mfnpq mya 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 units rio; pvq7jkvkhf (,tki(r8b3 i4 xu)l)1 0 ftxexcept:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the hbpd-(5e -mx9sbt on:r;lpezy*1r7x 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 tc 20qvba r1md/his circuit, the current0mb/cd r2avq 1

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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 changesc *0 +y ax26z ksde3.tcdfrn8o by what factor when the frequency ye*xc. n6okrda3z 2f0s8t + dcis 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 ioeddi6g4h: )qegk,l+k+/j1bhchpr9 z8 )drunductor is doubled, the inductive reactance of that induc dhdch6)rzio1 g4bj/:)hl +,pud e9krq ekg 8+tor

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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 induao 5;3:/:szgrtjzke9 th l4qpctor approaches zero, the inductive reactance of that c :;z4jalg sz 9tqrp :5k/3hoetoil

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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 circuit6c kvj7((ps 0jxpmntd* rp/j 5, the currentd jpjpj7mcs*t5p6 0 x kv/nr((

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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 chatn) l9mi4y;gv26vuat nges by what factor when the frequency is trav;mt 6ntg y2vl4u)i9 ipled?

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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 approache4zb u+62b0z xtvc4nh c:n uh7es zero, the capacitive reactanc4+b 2nu nhtc:xc z6h4zevu07be 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 between the mewulc06so +9voltages of the inductor and capacitor in a RLC series ewsu l0m+c9o6 circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is de1bej/l vv:7e1l9miomfined 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 ofwtc)n0l bbv s93 7;-3izvmzh s the circuit increases if R increases. When is this statement b-cth0nbw svzz;3 ml97i 3s) vtrue?

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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 iog*p/v*uri u-b l 6pz:mpedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit 9dk2ljmp;.sc 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 5pa13j0znpgyz 4d ,n6 yqg4kk both double in an LRC series circuit, the resonant frequency of that circun3qd40j4p1gykgy6 a5pzz, nkit 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 bysl.yi ;g--6egs i9d ek an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circ mx-+vep4ed8yuit 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 0.2 aphwtivw18 42gw()m+xymn /v0 T. Find the magnetic flux through the w mvg) a(8+1x n tm/v2yiwphw4loop 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 fiel.m afrqrrh6p/,)e)hb d of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetich, a/ rbr6e rph.m))fq 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 rahb*somt2qrxdbkr*by s9;n aa/bj : + -y+m8y.dius 0.10 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 magnet/ .ayb9s:b8 nt++sx2 *bmy*rhr; ym-b qoad kjic 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 singlxgg q9-xe- pb2nx9nqk -2zg4ie 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 changcnj xu*iv, 7j,es from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a jzt 1r*kcfs37square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly frok3 rt sc*7fzj1m 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an ary 1eopg9k07fgea 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 area 09 c5ls ll2 t6ocdcks/$0.20 \; m^{2}$ 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 fl971amx zys8 (yr nxu;lies horizontally at a location where the downward component of the Earth's magnetic fieuxaxn y 791 zlms;8r(yld 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 anzak,al3sn- :)3 l wqosgular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constaq- l):akn,zwls 3a3o snt 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-se:2gs p3bngf+lctional 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 1007h nh *,;zbxl8;yvjj8/kx8vpt /mqcd turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armmkwile 8:4q9u xbgy4x 2 tp6q1ature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotqqx ktgl6um84e :9px42 yw1biation, 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 6ecsp-bsgfhday6* 9,vel xi,f86 n4kturns 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 simplejddk4 cljf.v hp)0k 0) AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. Ifd)hkf vjpd00c)4 j l.k 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 with a maximumvsg ,mgiuv;;q mj*f0 hvc0( r5 $emf$ 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 x ,utt9g44t h7esyflc0elk x8-7zer ,resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance ofjs+vv16*g1ueaibj b, p0(fe3mupu ( n 6.00 W. The motor operates on 120 V AC, and when running at fulau+fu1j vmp*j,3p e(bgeu 6nvb1i(s0 l 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 internaqw/1i jz3mf/ -ci4 dnml resistance 6.0 W is connected to a 24-V power supply. The operating cur 1i ncq/mfwi-jm d34z/rent is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connec7iknyrjb3iy: :0ivt+ ted to a 24-V power supply. The operating current is 1.0 A at full speed. What is vyj::ky ibn0ir+ti73the 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 :aisdd2i-cs + resistance 6.0 W is connected to a 24-V power supply. The opds-2cad sii +:erating 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 reduce a primary voltage o f.kfpjm, mc /rgx*b(rhc00+mf $120 \; V$ 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 flow in the secondefzmi1uks.*) ary. How many i ukzse*f.m1) 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 arfz mf942i4u (pr;jbip w-5nwq4 ghwr ff5u2.f e necessary in a 110-V primary if the 24-V secondary has 100 t( 4hfw n4 bm if2w jzuf5ifu-p52fr4 pq9w.;rgurns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-t me :0+)elgqx9mmtk7nurn secondary coil. xg0qn:mtm m)lee+k9 7 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 flowsog65rjt r zt8q:i;xp 1 in the primary of a transformer. Assuming 100% efficiency, how many ampzprj 5qx1: ig;r6tt 8os at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provideio gr-(uk8y kxy 9*,lo 1+revxs 7500 V at 10.0 mA. The primary coil operates on 120 V. What doesg(rvxy+-*8rko 9kle1i ou xy, 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 60x nq4n(-d+jury;0z ek turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what;zd+u04xk ern qy( -jn 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 az009*gde msb o sb 93xs8yca6xnd 300 turns on its secondary coil. If m 30oxaxg8s9bbz9s 0c6*ds ye 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transforqd.k 2f;egwq9 /)oy nkmer 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 at the secondar)q f .kwnyg2o9 ;q/kdey 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 ha*idbtq h/eu8t,h j;pl3j - s2qs 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be b;q 8thju h-ei,/j2l *sd3qtp

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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 l lx *x)*bt5s*oz:on4b1 yvkf turns. If the power input to the primary is 100 W, we can n5xy4o*b o tfl*v)x1l:kzs*b expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A otz 8bykv): tao*w0 5oqyn 5tt+f current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns bo yvtw)atq:5 0z8 ton* yk+5tin 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 60edjl- f.82zb odsj+6b A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmiss dj2fb es8 6zj.ld+-boion 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. xe p+k 82ovpdw)-boz2 The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost ineo+ -pb2vk d8 w)z2pox 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 W6vpal+ n:fij 8si q p7(2gh;xwwyz, f*. 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 wf*ixw;lp,gypi7h(:qj+6zs 8 a 2vfnwith 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 xz*7sq6 xv8k zhas 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 k8s7q6*xxzv z. 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 much0m+m fuzqf9y 8 less power would be lost if the power were transmitted at 3000 V instead of at 1f9m+08 zmuqyf000 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 wz1xmt0d. lel ( 1rh:6b7ds ssmith resistance of 0.60 W. To what voltage must the generat:l.x11 mdehb(s tm6s0 drslz7or output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in the i:f:dxk u6/i nooem4 -coil's magnetic fi o: kionx-46emd/f:uield?

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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 inductor9so r ( kurfru4fuw,0(. What is thir( ,uu urw9sorf(f 0k4s circuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltag/s xgzy2t.l5 a8x:xebe 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 inqa *a/ xzto.ljs8,xm- wsd:s08fu,no j-*u h bto 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 f .29bu t+s1 q z(,bpazg4yol2vhd4pz120-V AC outlet. What is the resistance of the lamo4 ,f 1d+lgp4ph q zy vz.2bat9(zbs2up?

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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 c1bm u 7-pi ea2bkca( e3x;sl. qhm,:aaonnected to a 120-V ac power supply. What is the peak current through the resistor?s(qam;-a1ximup 3h2c:a b7., e aklbe

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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 w*u7v n.tcd9xa 120-V ac power supply. What is the power dissipan x vdw7*c9.utted 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 50-W resistor is -d3agjg8 69xa*hfhnf4n+g jf$I = 0.80 \sin (240 t)$. 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 50lfr *mrwrpw *w,2 uxh(2s5t w1-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 resistor is z21n)4tqz du +gc.oklzj8j .g$I = 0.80 \sin (240 t)$. 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 aumpz 7ns 7.d)e 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 coil at 1000 iedy yz6zf :x(b6l:jkr)6/vf 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-mHo)isi *d+zx/2.gby x -.u e7eq2ljc7 npf v-wr coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive react wkjpa)7f i30l smszh, )sgxuhkk447,z tq.1rance 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 12k7w)sz0 ;rl el0 V AC at a frequency of 20 kHz is appli0lskr7l; ez)wed 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 co9qfbo -;di pc4-c4dmp8(bb yd il 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 capacitor at 10 tx augid2xxk2jb.67 h -y 2i3jkHz?

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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 reactancem d8 jn;c2 o0 nvy0sddtva4 rfxt,4y47 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 6xr,kd fb 4rb9reactance 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 reactance of a 0.010-mF capacitoolk9qfs,. yi 2 o3 5age60wvytr be 100 Wo 0a6,q.k 2 gi9oy swl53eftyv?

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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 ab6ig(;y x eji,wx-f)a nd 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 ac sew9*/ofs1*x6j 4, o qbjqyrih wries circuit with 12.0 W resistance, 15.0 W inductive reac j1j rqy/qbwi,oh*6 fwo 4*x9stance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz z. q8+c rihhq,if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serie. q+hh8czr ,iqs?

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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 1 gas5 cl/*hd8a500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitoa l*gsha/ 5d8cr are 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 th*elui c; r8r-;pko vbgqyflv44od:4 ))c-h sbe impedance at 1000 Hlv:;kdvu ehl4-;*pby)gf sio)c4 -cr ro8q b4z?

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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, what i5qhf ; l0g9ffgs the phase angle at 1000 Hz05g ;lqhf9gff ?

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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-mHvoz65 guw nss(tvl so ,7j1e+/ coil and 1.0-mF capacitor for a(/o17sgnzsj6elu, twv + v5os total 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 wita 6w z4*fn3gckcd 47okh a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2c46nzf7go3c a4kd* w k000 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 q/ktg )) 0tk qrknmmrz*o5zu 51g9ik3 450-mH inductor at 5000 Hz for a total impedance of 40000kr) 0k5tg51)utrm gmkq noqkz3 z *9i/ 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 b qi/1pequ6 ssvv l3gh5p x7)q9e put in series with a 100-kW resistor at 1.0-MHz for a total impedance of 15sp qx 9q/ 5shve7p)i6v13uqlg 0 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 * m3lopiqu6 v0)mdsl/. What is the impedanceuvmo0ild6l3 pq*s) m / at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz foeijcc0 j0a 0t.r a total impedance of 4c .0actjj 00ie5 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 needen-sf9 n js. ;-uo1o+ cqkg)iuod in series with a 10-mF capacitor at 1.0 kHz for a phase anglfo;1--ck)o us9iq goujn sn.+e of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz b-2sgtbm*u-jlif5 n;for a total impedans; 2nf-i*gmb t-uj5 blce of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. su ,cj3oh 3qd 45bdwy5hk y.t5 What is the phase anglbtk jyc.,q35 o d3yhd5u4 h5swe?

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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 1ddm5 giqm9p0-,:yep5dk,qhv8ya a8v500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serieqped8mqa 5d-,:kivma8v5dgyp90 ,y h s?

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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 29wqbp irn,nt p,2n1f 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz pofpn1 i2 n w,,92rpbtnqwer 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 caph,b-/k n1bi jvacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circui ,/i-n1 kvjhbbt?

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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 cirlz t8 e;b6stukbc* 1 p7:c+jizcuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supplyik* e jzbc7+t;6ulp8s:b1t zc ?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resace -c,2.)u q y)yxkslistor for a phase angle of -lq)c 2yyuksa. ,)xec$40^{\circ}$ 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 what frequ:bu.u fye*1 puency should the circuit be driven in order to have maximum power transferred from the yuefp:*u. bu1 driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W reshnw7aaf9 b:q, istance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit a7f9:wqbh a,n 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 circuit is zfd; c9fbg1. t$63^{\circ}$. 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 0 y q/g+k,5zgpu4le*wspyxrr zw/49d impedance of 60 W and a resistance of 30 W. What is the power factog+4k/ 0yqzeu9/dp r5l4x s,p wrgw *yzr?

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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 t/xzm5 fr-u 1h*wv4hh3blqu6 RLC circuit containing a 50-W resistor, a 10-mF capu u bh*w1vt/h6f3 r l-hx5q4mzacitor, 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 freq6i2(wp kbim r s5;edvuf(6c (cuency of a 1.0-mF capacitor and a 15-mH coil in series?ci5m6v;w6reicp2 (ksb( ( df u

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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- d 8s8ts43p:o y iktmpn3cnk :*p;qcr:mF capacitor for a resonant frequyoc3*nrq:pp8cm ss3; p dtkn 4t8:ki:ency 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 resonant freqy6liv:wr; 3uz5 z;t 79ddsprquency 6p u;9 :yrqdwi vz 35tr7dl;zsof 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 a 30-W resistor and a ( ;gx138e 4dewvrpi6vovq5mv40-mH coil if the resonant frequency of the circuit isvr84ovi6d v q;pxm3g (v 5ew1e to be 1000 Hz?

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