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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: 游客未登录  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 magnetic fluxa.mo(:sq ).ayxnk(xjl q n 9n; 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 inde12tm/fjp 3 0rq hkl).)w xkkguction 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 loow7:pku/ n94 m lk5opbtps of wire in a coil produces what kind of change on the plw4:kb/mupt5k 9 no7 induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of )lgu- ii ++e7xwrocn /the magnetic field through a loop of wire produces what kind of changxiwoe i)u++ nlc/g-7 re on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change oyme: z(q 7d)1wz9v oj3z-;h9wic qksjn the inducqqwy1c99 j im-s;)kh (w7oz jz3dzve:ed $emf$, 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 fe5jw(v*/ukly rom 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 k ankc2;m8nw..k kr a4induced current in a conductor will be that which tends to produce which of nack.42wa. nm8 ;k kkrthe 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 liest0u3mkf,.b4ic.iz 45 ws,khgq92u6 apv ufbm flat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. Thb9 umwztib f23hk v54qs gmp,.,if.c0 6 u4kaue 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 fla u*nn c2ntmiql,d+ s0/t on a horizontal table. A bar magnet is held above its center with its north potdql2ns/ +nmcun 0,*ile pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where t+ )tl-. dqewuox xusncc xoi9g0)m00, he magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in thiloim q00e,o)9 d u)g0 cst+.wnxcx-u xs 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 field vects:jtu9hhw * yqkv-qu5 q():pm or points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the :qu: jmthp (*uq-wv9ysq5)k hfield 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 aa3;n);,mz:/bdo5s bl-jfnli a uuia ;m9 0llo region where the magnetic field 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 field disappearn3u :mfa, l; n/u 5)al iblo;b0m-9ads zol;ijs?

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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-increasing 6esm8ccen pz(x2d0tfu( khjrw e3 17, current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the inducedxhd7 0mue6 k1wz(tr cesnf c(8pj32e, 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 ente bt hs0/:nwo5s4-z l0ksnf1ioring first. As the north pole enters the wire, the induced current will be (as viewed hl05n kow0-s/b i:n foz4ts1sfrom above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whoq/gdhz7 k9gqbc( cq+3se direction can be varied. c+q7zc9g/bkd q3q( h gIn a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis 4kpw pt9 (;qgswhose direction can be varwk q; tsp4g9(pied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.rml,pny913o xr7 f/5od jewt66+parl
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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 an/uc4 )n wbtrpy cf+ z)+ex3*uc $emf$ 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.4astl rlk 1dx/bs0e:2 ,7meol The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is v(9lg9ll):d /z. jpkj-jt xjymoved northward at constant velocity through a 9 jy k-p(lxjt.j9gz ljl/dv): 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 bcl l0gxy z9el/ 9wfb6)ar rotates at 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 d 9abdgwj;h8fxef3ge 8b h- ki0om0* .transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. -bi ggqu ,0,.a ixm/ wushkdru0rt*.; The frequency of twriqbuirhu g,x ms,.*g- .a0utd k/0; he $emf$ 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 useq.e t6b(:d22zakkos h 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 devic hm n*h2-n05 fxjj3fyoe 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 contai -f4r/ mofby+xns more loops than the primary coil then x+4/m-foybr f 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 than the seconday55r pd(ix livyym5 +5ry coil then it iv(y5y riyip5 l+55md xs 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 ponzrlb0o,v t4/ 9y 9uofwer 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 resonanvbouc6 rs4js etj 23 sd1lzqy/074 4iet 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 conns6suah w 1ig m,-0d)gxected in series to an ideal battery of constant terminal voltage. At the moment contact is made with x0, i6 )uwmg- asdg1shthe 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 inducndj*7d 9sal5fz 9yc yp--jiw9tor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the batteryi-n95 cf* 9-zjy dwl7sayjp9d , 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 resi/( q8zs3f:vvrynbz1p1 igv*cstance 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 connecte hbk3huedql3,*7 j;syd 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 connep jj4;d4 zsjc g/1o8yit2o vu-cted in series to a battery. The time constant for the circuit represents t8j4o2cg p-4 i1v/osz; ytjujdhe 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 a1*i nn2 twwrlodptvo od71;. 07hcj5rre connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the t l h2 7or57on10nt;pitdj w.vco1drw*ime 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 5,vr;zsc lma.l2+qn( j.ozl qthe same 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 p4 pbu+ ig cih,**)dxdv o64wzsower supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the cupvkiebr7(w :rfv,w:/2dr4 oa h;13e3 kqjge t rren1vw k2rqh3f7 p jretd4wo:ee /(gai;b:vr 3,k 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 when the frlp6+az2icbok 9k y ,j6lzhz 86equenc hypi6zlzk,la8 +b c 69kjz62oy is 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 acron9-g-kxel r,i ss an inductor is doubled, the inductive reactance of that ini 9,-x-ngerl kductor

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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 fgfzz-lp anm55q o *6-1qfy.nan inductor approaches zero, the inductive reactance of tq5f --qnyp1g*m6f lofz5 nz .ahat 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 cw5l4ume 7ey-)r*r;y 9e p vmhiqa/s*:u6rj afircuit, the curre;mmaia)ql ee-9: y/yw*4rjsufe7u* rv 6rp5hnt

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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 factopis+i( e57cygy .:j5gyw1kzb r when the frequency is sb. wec yk5:g7j(zy5y 1g+piitripled?

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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 vo)7r dyi2i u6ssltage across a capacitor approaches zero, the capacitive iyri7 ) u2s6dsreactance 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 voltages of the inductor and capacitor pbmyk*3c/iwok *h6 * yin a RLC seriw/*6*ymkkob *yp hc3 ies 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 y5u(1a 0 mfvmban 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 t6pn uw4:,o u lg-m+ zs/jxf(lkhe circuit increases if R increases. Whezupl4(w ,sj +kmf/g x -uon6:ln is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit.o8,sjx bpy)) 3zt2 x3yhu3p cn The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuil p2x;sc k/qa;t. 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 capacitance 0m+8kgbd(dcsk9;gqe ju2x9 7 ueq7jx both double in an LRC series circuit, the resonanm 9+ d(exeqgukdu0j bg7q;8jc9 xk7s2t frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. /n4m*gh0a:r f7 kqyyc 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 cii+b4uy9ii- pfc .tpff ,+os48c/ u jyhrcuit 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 untn;/t+ cwal1 jiform magnetic field of 0.20 T. Find the magnetic fcjtn1t ;/a+lw lux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field d +vi, vd,:vjvof 0.20 T. Find the magnetic flux through t,vv,ivdv jd: +he loop when the plane 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 oha)(3ub/ 8gmo2l 0heq-a dc:3 bkxzlif 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magb a)2xm8- k lu ehg0q33abc/z(ol:h idnetic 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 reduced frogq y:3s v)e,yx cw6w.ff5c3xbm $1.0 \; m^{2}$ 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 f 01hv 1r4ald ep.r+ullrom $4.0 \times 10^{-5} \; Wb$ 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 wi ,9nwc. 02- kzntojoaxth sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field ch.n,-ax2kjo0z t wnoc9anges uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area j 3ae8rl2q)k06szh ihh (+zav 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 rhtx/h( i- oxwbi8s: *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 horihr;de(ip9hm mb 0dsh-2yq19czontally at a location where the downward component of the Eay(q dc-e;si r0992pmhdh bhm1 rth'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 cea 0i9 :0an1,aossw3np5r ( 0fawboris 2.0 m long rotates at a constant angular velocity of 2.0 ra0r0 na0 o5 o w:nwe,(piaf1sara 3b9scd/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectiouegqx1h xb56 7nal 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 of area hg9cd ) b4b8,o vumv2o$0.090 \; m^{2}$ 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 iljv56xa1pfp mj4w u5i;m+o3ms 12 cm longp vm6am53l fmp j5jo1w;+xiu4 and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of are a7 p5ni*ikm7 iuw 42btc1n;lwa $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output of 12 e2*qs se(mk,aV maximum when rotated at 6 ( ,aeskq*2mes0 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 generator with aihmdw w 5g8g)s8ec +8xa4e3 nt 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 *ecc3ci67 rj phave a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W.i,y cvjf9pr9)j3: xv )oa7 ill The motor operates on 120 V AC, and when running at full xi9apyri9:7 vfl j l),) cojv3speed 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 connecdlr /57( zskkepb:du7ted to a 24-V power supply. The operating current is 1.0 A. What is the start-up curr lpzbs7d/dke(5 u:rk7 ent?

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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 resis1 toe;oq,j af 0+e7qzhtance 6.0 W is connected to a 24-V power supply. The ;hqa ,f+710jet ozeq ooperating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply.wyb0+rgnz gp uj7 ;18r)cqaf. The operating current is 1.0 A at full speed. What is th rjpg;r 0bwcu8 qgn.1yzf)a7 +e 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 prima og2 u-. xk5s*/jjcsngry voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to f*l) d ,q3 x lal*ex-kpwrvp;e,low in the secondary. How many turns are in the pe;xpxa,r*vdwl*l e- 3, klq)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 pri:yyp5pvjw 6z, (ns 9 8bgohpc32+a ymlmary if the 24-V secondaryca ny(365 +oyb v9 2 gp,w8lyms:hpzjp has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coilrf5))/ q0)r+ozks0*i:ifcyu fop6n. rzf fan and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the prima.* 5fyo6q/i 0rfs u)f z o+n :0n)frizfapkr)cry?

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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. Asskdjmb(2 ra 0s3uming 100% efficiency, how mask2a j br0d(m3ny amps 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 prwk+*3yhlkcc41k vo ,eovides 7500 V at 10.0 mA. The primary coil operates on 12 cvhowk*c+1kk34 ,ley 0 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on 8 lz.cpssx3;oits primary coil and 300 turns on its secondary coil. Ixzops8s 3 c;.lf 120 V at 2.0 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 pruqnhwzq ;/*0xt e:rs 8imary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary*etqnhx0 z u:r; s/8wq?

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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. Ipc6hi 6abm(5 ff the input current at the primary is 1006 (a bihm6c5fp 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 tra* 5implo t3c1ugto s9+nsformer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 15ot t9ips*gm13+ oucl00 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 tuvodjth0 c7o k:sg 07p6rns. If the power input to the primary is 100 W, we can expect the power output of the secondary to c 0ophkv:gtd6 7sj70obe (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 gwunk p;byy9vmjf c,yaveh7(9x 4.8 7 at 120 V. The voltage is usually stepped up to 4500 V by ayemp.ny7agj79 , wh;v vky x948 cf(bu transformer and transmitted 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 Ab8tm -cv1k(wl+q ox0p of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of t(x qmvpkw 81+0bctl -ootal resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 1zu40i2ot d r(u3(;k sr +uetbo20 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 sou + k (titue z24(u3obrrd;0percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. g/y jh(rh)* kvA 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.kgr v(hy/) h*j 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 resistanc tx r7oo:aji/df eg:uq65k /b0e 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, 0uo:k:rx5/b qa tjf 6ed o7/igthe 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 ,hj1 gz8+hl 4iiy htb,down a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead1lg4 hby+ ih8 zi,h,jt 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 zdmmhow94; + aline with resistance of 0.60 W. To what voltage must the generator outpuoah+9 w;m dm4zt 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-+ -p(ytt(muh 1ilfuj. How much energy is stored in the coil's magnetic fiem+1 pljiu-u-h(yft( tld?

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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 x) i hdey,+m f (x(nc2-k/gdmyan 18-H inductor. What is this circuit's time constan2xfxcgn iydm-+,(m/( ) dk heyt?

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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 voltage zbd lmat,.*m1is 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. q)pjl/m1j d+lWhat 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. W(ik.ty m i3e3el:hh l2hat is the resistance of the lat ml( he32ey:h3kli i.mp?

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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 supa93fo 6anp ou.ply. What is the peak current through the rofn3 ap9ao 6u.esistor?

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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 seh)1i -mhklda(k 9hi blzj43 /upply. What is the power dissipated in thek ih(3e zl-j)dlki1h9h/b4 am 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 7b ni7 wqvk (v4e;iqt:$I = 0.80 \sin (240 t)$. 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-i6 cx2d )ta1rfteyat * s5:5neW 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 i- akn,bvk:6y0 ygwn3ts $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor atbq h7,gpqef6 . pj6s;jknr;afz1 4(se 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 rea5z 8qwalz6*or ctance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 1 lt v/wp7 qe,+qqpufzs9-* j g(3uxo/s4.0 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 reactance at 100-*- krhqf :a,uh3djiv)wbfq10 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 ACimzkca 3ui2 6:i svz b6vj923h at a frequency of 20 kHz is applied to itz:6 2aiu32c6vz 3ji9vmb h iks?

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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 th b9bn(ztsp4, d/a6 z4t:nfa varough 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 reactance oflq6dsp,w uv5hf3p(t sdx-5y: 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 needed to have 50 W of capacitive8u; 0o86kd 8hxwrdhh0tr kv g/ 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 zv:p/yzpu)4m actance 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 capacifo-y cman:1yz 9 ot62htor be 100 W?mo- zc6ay2n9:to1 hf y

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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 c+ wk/ushlt ,-xapacitor 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 ac seud ./2zfnmp)q6a3qu trd *y e6dy*d,eries circuit with 12.0 W resistance, 15.0 W inductrd eud apd t*y.qq6*e)y/fzu 2d3nm6,ive reactance, 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 ifj7vb8zg3d-rfvkm 4tc6 ,az/ 9u/npp l a 100-W resistor, 20-mH coil, and 1.0-mF capacitor arem/lr,4jn8uz3/7kg- 6tpbd v cfp avz9 connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1w20yj lj/pag*.0-mF capacitor are cjgw 2a*pj0l/y onnected 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 -- zwt,iof-cmd oi, d8is the impedance at 10c-- owt izdo,fdmi-8,00 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 2re 2z6bi o*ecinductor, what is the phase angle ere b2ic 2z*o6at 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 ltf21 0s:qi ycwith a 20-mH coil and 1.0-mF capacitor for a total impedac1s2lyq: f0t ince 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 seriesy/3sn 8c: chk3nmh/ev with a 100-W resistor and 15-mH coil to get a total impedance of 11snm33k :v/nc eh8 c/hy0 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 atau)),o a-*pml dir/up 5000 Hz for a total impedance of 40p, )a )lp/r am*u-duoi000 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 /prd3rch) :. ltzmbq(*u4m8yqi/ho vin series with a 100-kW resistor at 1.0-MHz for a totyhb .mr4/i ql(ph cdmr)8ozq vu3:*/tal impedance 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 cap0/hs4vr b)ji qacitor. What is the impedan/vibh)js4rq 0 ce 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 for a )yylkym/w/ericjcy4 c n *d-vcd 5)b6 62e4oetotal impedance o 5oc4yrkie24jd -/el/yb) yn*cyv c)mc 6dew6f 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 nhl/f/(rordk +)pt8/el +xg 5xb m:yjseries with a 10-mF capacitor at 1.0 kHz for a phase an/j:+mf5gpb+nlet(r /)r8o x/ kly hxdgle 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 : (b7c9s/gr3dfwdl my in series with a 30-W resistor at 1.0 kHz for a total impedance of :s rb7d9 (dl/wgmfc3y 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. What2oe*eozc,yg / is the pha *yezoe2o,g /cse angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1+r k -4j1 uv9p.oyftjx500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are c1xjy.9o f +v jktru-p4onnected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, as;h;z s zhv9g 5(xa fyzox)h++nd a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What 9ygxa+f vsxo;z5 z)h +zhs;(his 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 indu19eoz fghwq ..3smi3ictor ow93z i e3hfsmg.1 q.oif inductive 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 for a serbarw2) n7mk6pd /u,cgbn;dv rew4:v* ies RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, w gar*w2kpn7); d4c/mnw rvvb6:eudb,hen connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase angbb xhp-.4 ye7fle of - yb74behx.f p$40^{\circ}$ 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 = utgrh1o+ 39ihbels:1 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the drhs+ugl3i 1e rt oh1:b9iving 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 cj a2z 3wnph -(tur s0nhv.c0t:ircuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connecte(a0 z. snj32hthn0cwp vr u:-td 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 isn7k1jltt0cmep6/ dw4 $63^{\circ}$. 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. What/mkzk:/qqtv )z 9k15o pu8ncr is the qt:z/cvzuo pk1qn)r8/9k k5m 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 avr7c6)qu es8j series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz vqj6 e )sucr87power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-0-jcdlpdw0nhx1h0 3q1 *bpcrx 3 gj (qs4ps l-mH coil in series?*s cn4 0j(cgsp dlx1qqjx ldhb--0p0 3h3pw1 r

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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 c2 -eu0 / kv(o)gq gnlf:1ingkxapacitor for a resonant frequency of 10 ifkg2(x 1: neku-lv)/gngoq0 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 serw2 lw ds6 cyg vi22n5a axwl(u,)t1r2wex4m6iies with a 3.7-mH inductor for a resonant frequency of 10i wmi(es n6dyc1g2 6,lu25wwlv x)a2rwa4t 2x00 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 mu v6(xglc ( :fipd1kxiaa3m x;.st be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 100: kxm( (x igi3daxvc.fpa;1l6 0 Hz?

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