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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 magnetic flux 8ug ex a5d(2cj2t h7i z2-nzeqexcept

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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 inductidmzn) /*cnwy)z-pq9ton states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kiuqqhd+5n6 wl )nd of change on the indu6 h)+ wd5qnqluced $emf$, 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 prf9e7 yfv1 g5zw4xl- n ggnks1i-vs6l:oduces what kind-iv9g yw 1l5f46f-: n7ex1g svsnkzlg of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire pru6 i-;fy)5*hp u, pe1mfwiydroduces what kind of change on the inducef p)r,uf5hw6iy-1 u*me yd;ipd $emf$, 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 field an / 4czimu/dfgv*i oi57$emf$ 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 condkyiljp umu2e39wu. -1 y0/k ruuctor will be that which tends to produce wuju ukiye-u/ywl.2p m913r k 0hich of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abrry1e+, m.k rmove its cen.rkm+ m1yr r,eter with its north 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 horizontalhyd(0em- r/ vj table. A bar magnet is held above its center with its north pole pointing down, and dh-(y/vj0erm 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 wherp 2z90u*lsku79so a lwdv; /vfe the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sensvudlpaf*79o2 ;s /0zw v9lukse 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 field8img puy7veizny05 w 6*9e5fr -(var y vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the r5mn5ay0ivu9 y6 fz-wv8( 7ie*ygp redirection 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 horizontfc f.(g+(j zwb.z/9gvrpc d /qal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, whatr.wgf( gc dz+z fjq(v9p./c/ b 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 dno u-j2mqq:eq4;cc g7l h/t/and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on4 n7t-j/2 qqcocdhme g/;uql: 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 thwv: ) ezmyoz01tf (vsuz4t7 :fe north pole entering first. Asfv1:zy ov(tuwm)s 4:0f7t ezz the north pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant aqv-mnui .+tra: uu.0qe13*cti:l- 2mx whwpbngular speed about an axis whose direction can be varied. In a region where a uniform magnetic fiet 10thl*v .i-nra: q-bw c+.qmw3pui2mu eu:xld 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 a1( q*x/tgp* adhrrauhf /9g/;dpr ) htn axis whose direction can be varied. In a regio1qr9/h )grap(r xtph uga;d dfth**//n 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.z+ slx -u51qin
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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 1bbu n ggfu-opsk0(vu 0i;v *+that an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. The drcz8mg(yz 32$emf$ 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 gmw4g qpzd9g7.yjj2,w.3ib;l vvw/ o-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potentialjzvpo/gbg7dm,ql4 i9.w j2.g;vy3 ww 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 d8xfrj k2 8o1kcbna49 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 transformsp:e ;9g4aojdum:c+ wt

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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 sect71x i1i0w m2nyij8kbond. The frequency of thei710wt in2 kjmb 18yix $emf$ 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 devicgb 8s1*tlpoe.x4e zf6jq+)t ge used 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 t) :wgecinxi w2p2. 3; xdz+igphat

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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 secondarmfhv+: ( g3fozy coil contains more loops than the primary coil tv f3fo+:( gmzhhen 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 morepy1/ pdo sj:i05spd6u loops than the secondary coil then d pp0j dp15/sy6is:ouit 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 inpmdr3ljg2w+u / jlz. 0xut

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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 circuit,t+ fv9idu)p2;ciw t3 yeiz h21

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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 battery of cons) c)9pa9*eoen/2etfv uoyzt ( tant ter9tv * 9ctoo/uezyp2 an)f)(eeminal voltage. At the moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal us gm 727gbz+pbattery of constant terminal voltage. At the moment contact is made with the batterybsmug g+p z277, 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 induc g j49fhk;lf j3t.fvbl8o1ea* tance L and 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 inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connected to d:go 5 pp;sc66o*yyz y ti.kr5an $emf$. 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 connectedb8,i wxmd6+j yg;7wy:xvkjv06jm. ro in series to a battery. The time constant fdywv66o7m.0;8m,rxj k gw:y+bj ixvj or the circuit 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 in- 7 qv5rq0,h6kd-tisxv 7ju fkductor are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represent-k,7 q vut 7dhv ki50fx-6qrjss 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 unitsov1m z9 d/ar3u 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 power s r9rhqph.hhg y059x.f upply. 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 taskl5xq32y,y v:ns e9 his circuit, the currentx, 3n9qlaky: s 2s5evy

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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 aj 377;mpb7ll c;zvtsan ac circuit changes by what factor when the frequency is tri7mljl; bzp s73act;7 vpled?

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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 . 0j+7jkrc.n.rmfaev AC voltage across an inductor is doubled, the inductive reactance of that induct0rarfnv.kc7.j.e mj +or

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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 ac -er v/w+j x3p(jxziubp.: /ipproaches zero, the inductive reactance of that cojpvx-ie w/:xzcj3ui/ +p(.rbil

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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/ ueu1ik9:)cmzr ;nwhja 0om* circuit, the currenc:0; i1nw */)9e au ruhjzmkmot

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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 pm znzwo(uny16oiv5 2:u b8q6ac circuit changes by what factor when the frequency is trip6n:qui 2yu ozo n5m86vb 1(wzpled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the capac ibd0xbochc/z 2((2qd58uchj itive reactance ic8(h cucx(b2q2d /50db ohjzof 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 capc0 0wnv*2okm(tx x:x jl.vf*racitor in a RLC series circuitt0r ok**cjvw(f ln0xx 2:mv. x?

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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 circ0.1bta3 6t:f;iab f ho d(xyyhuit 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 circuit0 3r 5razm3b wjj niupd4*k2h7. The impedance of the circuit increases if R increases. When is th mp5h2in ra k 0ru4z7*jjb3d3wis 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 circuitg /i /km 1ump4qy20duw. 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 circuit. The impedance of the circuit i- p)as ,7s+ id;7 efvaaeqvv+etwus46ncreases 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 t;lopb9,gei5 fhe capacitance both double in an LRC series circuit, the resonant frequency of that circu5piebl fg9;o ,it 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 b u1* dmoh5yr+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 occurs whenx6j6j* (suqw(kqdofxi1 tk.*

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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 *h 1hb bfl.)ivin a uniform magnetic field of 0.20 T. Find thbv)1 hh.* bfile magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.20 *o61h eaau/ze T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector6 ehezaou/a*1 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 gslz8i* nu/ -zfield of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an a*nzlgi/8us z- ngle 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 oe62ns356 nm/ fvnnkw7w o)teyw;xu(gf an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes fhni9k as/o 2v( *d9leorom $4.0 \times 10^{-5} \; Wb$ 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 ofb4x qxnyx1 h.: wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of th:yx 1h.bn 4xxqe 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 tuutg ,u;j p1iqq t0;hh:rns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and ak:jr:ks i. lqp8f9q (erea $0.20 \; m^{2}$ 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 ofoj(0 -n sib6 6)ev7nnnh8ndxz 60 m flies horizontally at a location where the downwarnixsn)n8bho j(n7d ez-nv660 d component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m lonry+2 mui )/0e scobgdw,c8-mmg rotates at a constant angular velocity of 2.0 rad/s about a vertical axiwm0m+/ -mub, cdorey28sci)g s 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 cros;s0eqaona*;a s-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wiret*t z33hcwrb7 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 8y.d;zvl.o*xt 6jyes70 rectangular loops on its armature. 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 axsjx. .6* vyt7; oeyzldis 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 consistu aot zr+7g370lm4pb zd,,wbb s of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generato+s;aodjlq 39-z ntf-rr with an output of 12 V max-t-9rz3sl f ;adnjo+q imum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a maximumm-3dh n -ckaeum18c7 t91xcam $emf$ 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 operates on-:q f6/xo qngy $120 \; V$ 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 resistancec7v5zmn:qs o3to ii7 y5y3u +p of 6.00 W. The motor operates on 120 V AC, and3yziu5nt3s75yp cv o7qoim+: 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 connected to a 24-V powerd g agv8zxbw l/9(*:zj supply. The operating current is 1.0 A. What is the start-upwj:l zdzx /g 8(g*avb9 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 connxy n2f: 6gred0ected to a 24-V power supply. The operating current is 1.0 A at6n df0:rxe y2g 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 internal2vxgn 63 y wv3eknz,9e resistance 6.0 W is connected to a 24-V power supply. The operating curren xwv 2yv93nk6ze,egn 3t 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 needeyn.0 vt2xi/c td to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn prqtktc5r( 7( ia0vpgk8imary of a transformer causes 14 A to flow in the secondary. How m087caitq 5v(kptrgk (any turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V 3fqh:ly+,pcx .dp(k xprimary if the 24-V secondary has 100yx 3l+pc .pfq(hkd:x, 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 coil and a 200 pem5pfui(f s1 3d(ufye4(ej)0-turn secondary coil. If the current in the secoye1(u() iupjf3 5 msfd(f eep4ndary 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 primaryjy grj(/toyqxnv;. 0 : of a transformer. Assuming 100% efficiency, how many amps at 24 V can flo njxq: gjyyr;o.0t/ v(w 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 provides 75,( hvnph( l4vd00 V at 10.0 mA. The primary ,v(h p lv(hnd4coil operates on 120 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 tz hlzarrha2o v :5.p5,urns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applizrl,52pr z5 ah. :hvaoed 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 it ja+7(ucjkwu20x/0etel 6od os primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is apc jal+00 do(eu6u2et7/ wkxo jplied 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 transformer has 100 turns and its7.gg3wlx,cl,z ai:b p secondary has 200 turns. If the input current at the primary is 100 A, we can expec,wg .x7,l gp:bl3z cait the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 tur jn1ye v49yx,l+f tj2cns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the outp9exf+y 2jtny jc 1v4,lut 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 transf.-v e:5ln85lcfc4 1y g wwsxvwormer has 100 turns and its secondary has 200 turns. If thn58:f41vygl5.v s x-wcc wwl ee power input to the primary is 100 W, we can 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 of current at 120 V. The voltage is usuall2orh:a++ qbd oy 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 in the secondaao:2hd +qo +rbry 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 voltag mriy z65 k)kox; jz.ek86/ycje is usually stepped up to 4500 V by a transformer and ko kiy)xr6y.8 6jk /cje5z ;zmtransmitted through a power line of total 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 120 V. The voltage is usually stept49s6 qw8mg fwxben; to7im05 ped up to 4500 V by a tram6f8o w 95bwegqt s0m;x74ntinsformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission lijrw wwe11 2v6bykf60qne 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmis1ebq wr6f 021j wy6wvksion 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 rrekco:c9l -y) 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 transformer with a turns ratio of 100:1. What percentagee- 9l:ocyrk)c 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. Howc c u0 u+oweu83w*p:fz much less power would be lost if the power were twoz 8uu3ce:w+c0pf u*ransmitted 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 1bork j,,,rzr is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage mok ,j ,1rr,zbrust the generator 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 i .dqvq;pjk oxzk asodw;w *(0l )vy8vf6:f-.z s stored in the coil's magnetic qk6 s0v*xj.pdwwfzo vy8;zl)fq :a-;(k. ov dfield?

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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. Whatwv 0vhxn31 i,a is this circ1vi ,x3hwvna0 uit'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 Ab2j-d+ apbilgwi96 w5 ukb 1ux:*v6uoC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlc5q k;h dgcxnpzm* 5 *e-7pd rdpjw5651 xiz+let. 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 1s 3gs7fx u)dk ou9/hj(20-V AC outlet. What is the resistance of the lahfoxk 37s9us jug(d )/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 supply. W z*7ud6.bhb8sxwn1 j phat is the peak current throhb87n.xdu j1b *6pszwugh 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 wty+eusr2uf:zhlz e1 lq43* 8power dissipated in u4 t yzf *lw12e+e3l8uh:sqrzthe 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 isg4+ i7 wzz*eub $I = 0.80 \sin (240 t)$. 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 aa4 w txna0:e:*tv2eamu-hv*s 50-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-Wcu:lv),hm, p m resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60 Hz7n5z5 kxndlk p j5xgcw8/z,lz8rld6 2?

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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 reactanmy p nv) z 60 mgzdp:n:g7h8lq:ks72aece 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 wiw0a+g 0s) 7l 0n.k/rfycqki 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 necessa z.4z;2/bxk-daqix r5ny *h gis .vo;cry 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 a*,7g ticdq w:120 V AC at a frequency of 20 kHz is 7qci ,:t dw*agapplied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz sapq1 b/l7b gklcxcqe2p*/, e)ource?

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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 ofkjb72ir k mu0zuo0o 5( 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 capaci*ub1y m:gjf(yinqmhwn(d 659tive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reactance ; qcec(qwou+d *lo/ )tm c1q9:pdr3yd 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 cap53;z i/py4 sggztzq i,acitor be 100 Wzg z,5;tiisp/y q43g z?

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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 100ngw mx-; /hxv20 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 series circuit with 12.0 l gw: pof(*lj1W resistance, 15.0 W inductive reactance,:pwg1f(l jlo * 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 if a 100-W resistor, 20 rozd3;ou2ys/-mH coil, and 1.0-mF capacitor are connected in ser;3 ozyo/rus2 dies?

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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, an9hu)y1op7f dd4mq+ ab d 1.0-mF capacitor are co dhpum 49q1yf d)oa+b7nnected 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 n/+**tr zejx oin series with a 20-mH inductor, what is the impedance at 10 /x*nez rjto+*00 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is x( :9)mx+w9ml:phbbnx2 oc j ithe phase angle at 1000 Hz? nx mxh)o jmix :p+2wb9l:c9b(

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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 and 1.0-mFz s6s z :e e6-bgj,6ecmpa:2ff capacitor for a tos6pfj2 6m:zab-geecf :es 6,ztal impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-u dli+7;tw puf7 k kfry1n*.-uW resistor and 15-mH coil to get a total impedanceu7n +flfky k; ud7-rp*1uwi.t of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for l6mab dc5paafnj * (j ey2+8*ua total imc*8e(2*j u6 fnj bpladya+ma5pedance 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 wit+sx. (vg tl4fth a 100-kW resistor at 1.0-MHz for a total impt(lv.x gsf4+t edance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What is the impedrcqy mw)7yc0 hgfbj *6lz ur+j/3 99kxance at 1000u9c+rcm gjjf/*lbkwh y709xy6 3 zrq ) 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 capac;h( o .a :xvkp+wwp:sic;shu6itor at 1.0 kHz for a total impedance of 4p ox; h;c+v:s aw.h6i:kp(s wu5 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 s6p7/l tncs 9o2rw hnf6eries with a 10-mF capacitor at 1.0 kHz for a phase angle of 6wp2t onln7cr/9h f6s$40^{\circ}$?

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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 resistorp4 eewwh.w pb)4,md q,3y/udg at 1.0 kHz for a total impedance my./dwp4p4e d,)gw,e3 qwu hbof 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 fmj tq;+ k/5 zh4r+mqlat 120 Hz. What is the phaset4+mz f+j ;mrq h5kq/l 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 v b)ek1vyd5+moy(gf * and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF c +y kv1) (ebydmgfo*5vapacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 10aqcw p2 : daxc2t9.n/c0-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is conne/.c :2wqc9xtd npaac2 cted to a 120-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 capac fy*(sb rkp-g n)z;b1litive reactance 30 W, and an inductor of inductive reactance 30 W are connectedb1n(f-lsyzg pr* k) ;b 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/mez;i8 uatk7cm i j.4 a series RLC circuit containing a 50-W resistor, a 10-mF capa. mtuaez 8;icik47m /jcitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase anglemb uys0:p6x )4oqwuv: o:sp)um bx: wu40v yoq6f $40^{\circ}$ 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 h)g1 uk lrle n+ou,dso5iu+*lx;g j 0:nas R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the clx51l+ g gs *dlr;ou eunoni ):uk,0j+ircuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resiwp9:hy6 z z,c2)hzikp 4c(cnmstance, 15.0 W inductive reactance, anpk9ny() 6wi,2zhcc 4z hm:p czd 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC cisp3a ptj;7b.8pp/ tos rcuit 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. W4a50budjzi / mudq s i6g 0ubpqc,n4/2hat is the power factor?2/ubb46 acim0duu dsi4np ,/ 0zqjg5 q

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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 containr wxuhtl9 ).r2t2w-cik nqb.7ing a 50-W resistor, a 10-mF capacitor, and a 0.45. qhrt.2 n7w)l wb- kxci92tru-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 of a 1.0-m+wh(m-pm 9abzeo z7 l bvv:(-aF capacitor and a 15-mH coil in series?zpa(ba 97m(l+wv: bz-mho v e-

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor sf-bim-ykwmx du 6zm881* p(h for a resonant frequen-misxm*zwpy18 (6b -fhmduk 8cy 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 reso dz1/jf6nn;tq5r0 0ii2e oxsrnant frequencyj ;rid5rnz62 niq00oft sx/1e of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be place:,-r2fgh vx5k lod;myd in series with a 30-W resistor and a 40-mH coil if the resonant frequency of dv5x:k;o2f- m,ygh rlthe circuit is to be 1000 Hz?

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