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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 arethyjc2 9-a:og zzrsz52 8av7h units 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 inductio; vw,ib7.v 1(nwpfuy wn 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 kind of change ctmu:;tf pxu/74 r/dp on the induced/u4dtm7u xt; f:p/rpc $emf$, 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 t.9vsewz,jg.l8 (e r cshe magnetic field through a loop of wire produces what kind of change on the iw lec.8.szj (egs v9r,nduced $emf$, 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 produm yhzjgzwvi3zkad0j;5ij: z5 l1)u63 ces what kind of change on the indumzh;1wg05 ji z vyk5uz )aj zi6jl33d:ced $emf$, 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 fie8.k 0kukntgt 6ty2hj7:b.i4dci4p t bld an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conduc5o3m u 83 mxl,wsvo)ontor will be that which tends 8ux olsoo3m)vw 53m n,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 s 91yb:)5f 0jk b 65e*ortspk8k ;mxifmbb3afflat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The station8o3pm;s b sb55b0)9a bk1ff6:* iefjkt xkrymary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held a3ppzw(i/ c9v hbove its center with its north pole pointing down, and rewc/i3pv p 9(zhleased. 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/ ggq84,8sr /i intk vjv(zb9y top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When gq498ji, kivyv(tgn // bzrs8viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic fielxvlzn )+a p3k0d vector points straight up. The x+ vp)azl0 k3nmagnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where l3 5i9ocbu/tlj-a4mcd -n) a uthe magnetic field points straight down. The magnetic field disappears suddjc-t/baa9)-niolm d u4c l35u enly. When viewed 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 tablb,mqe7wob b*u ,9a9od e and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either siqewao9bd9ub,7o mb *, de of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole enterinj+o2payd5nq x5: kdh.g first. As the north pole enters the wire, thekhpy5:+ q ndxodj25. a 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 angular n ux2j(qz0s 1)aceqj .speed about 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 xqu (n0qa1jz 2jc)es.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 whp+6ls*)bpno vd4,cchose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of c6 bhvs)o*pnd, +lc 4pthe 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.xk5fu ff65 3w)djlf:x quw2i3
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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 anz-y;a5 2 h tfav*f(m(1-wwxpr lolsy5 $emf$ 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 fik3./m ai ;gq0nbu6kx9 tcv jf6eld. 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) i ,e.vifd x ov 5o62:1j,fyrxeps moved northward at constant velocity through a magnetic field that points straiv x.ep fdf:oo1ej 65y,x2v,ir ght 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 bvz mc/o20u wbdwz)tx.80dx-o 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 transforv/nf:rvacsy2 m fob3 x ,3+6azms

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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. The frequency ofcpid2pcr(+n-*; isi b the cipir(c* -;+s dp2in b$emf$ 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 s5poc:m kwz)pg ;*5xs2p cbac8z0uyq 4c,gr; 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 devikcpk2- ,b 8+: oplcuiyce 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 morel, 6ff wug uge5 30dnnkz1s,;t-2m:eo thqy1y loops than the primary coil then3u1y2tq-e:;m z 6nugl syw,k,oef dgt 5f 1nh0 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 ti 9y-1q chciq5he secondary coil then it is a- q1i q5ch9cyi

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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 in*k0i )dc 1ucqbput

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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 0x1tg- g-anmp 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 battery o sv,jxiu 0*6hqf constant terminal voltage. At the mhxus0q ,6ij* voment 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 inductor7khs6za wi 52+;p (zzf3 iqvcd are connected in series to an ideal battery of constant terminal va7f cz3w;hip5z2+s6z kdi q( 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 wh8hh qg zy2iup10s7;8l0 ie unith inductance 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 t v3ocxwr y*.9to 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 as6 vjhrpx i3n7-ghcy0;bdn4 3re connected in series to a battery. The time constant for the - 4r6hns7;y xdnh 3v3bgp0jcicircuit 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 indui4mjbno,k/w lf( w83ector are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for thj/(ml3i4k fe8on bww,e 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 exceptk8fcd buzh,/tyl 4i5 p3wl42j:

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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. On9y:h euw n7klyutd))3 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 thishspwo++uy /-w circuit, the currenus/phw +y+o- wt

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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 t8lx : /yj:xgldrh t1ae4h87t an ac circuit changes by what factor when the frequency is tripled? th7x:8l4ejt r gh8lt/a:dyx 1

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor isr(.pis6dcyo2p d r a651gpy* x doubled, the inductive reactance of that induga(*yi1 yxs526r6cd p .ppdorctor

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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 approaches g50wn;w6 mushb2 0u ewzero, the inductive r 2u0mwes0 6wu;wbghn5eactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to wb :b-l76-f;jsg u2vpwwnv+aan AC power supply. In this circuit, the curre:gnwuw7-va bw+; vbf lj26ps-nt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by why h7 cu3tejn.8ecy+ ucd1vt, ,at factor when the frequency is triple3ee1.vt,8c+yt cu hdjnuc y7,d?

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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 appr l/yp,7ok+zqjoaches zero, the capacq,7k/lyop z +jitive reactance 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 ind u3pk9d8snuw+ uctor and capacitor in a RLC series circuin9u8 3ps+du wkt?

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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/2oy ekieu6oz 7r4n9v 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 tq: -xkpcu.7hahe circuit increases if R increases. When is this statemuhc. px:k a7-qent true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circp8hfpz q,y/dw5 44n;.m qvc udv(kyw(uit 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 increaseswo3twp -/; eqp zcs 02fz4elu, 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 both dou bxk5/54p ai :hkyoku8ble in an LRC series circuit, the resonan58k4xya kb ip k/h5uo:t 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 app+p)dstou pkzgg*9h 5) lied 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 cipwj 3fn02l d ;elv0 was;ftr-/rcuit 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 rotatinrwz tp54rxd q(3c*d4or bt7. eg in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop wq*3rd4r4wx o5cpb r. (et7z dthen 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 3b11 dvm/xrhk j h(3zuuniform magnetic field of 0.20 T. Find the magnetic flux through the loop when thb d3jmxh/v11z(kru3 he 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 lph9n arg(2dai:gr8()c3 c uomagnetic field of 0.20 T. Find the magnlc(u2i:ha89odgp rg ()a 3rncetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop isx k4/ql jiv-va 2m *j4dc5xvr: 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 chang+e( t3v-yh lnn:o;/i:ywub v0x s) syues 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 square frame with sides 18 cm. A ,gmth i;s7 (youniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly fsmt(7,i o;y ghrom 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 turnss*p m)6 j62fdz oi.ctk 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 andun;dimon x( *r1tjj z8,on()v 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 horizontally/wk6pi ( o/rlg at a location where the downward /pgoi(l6 / wkrcomponent 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 tha-ji6lfxbq (the6 ;;rst is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s srqt6;j6ilf ;b x (eh-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 c4r/duhvcg mo tw2,gl +//ig5 a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists owlzeuceh49wn7vr21 ie b*z 1.f 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on it2/3x j lxogqz4uz)c5 gs 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 xg5) ujqx3zg2lco 4z/ 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 /0q+axz9 pfox73zib hdz7, ru turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator wi,xr.ylq)k r(lth an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of .qxrl(rlky,) 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 maximdg;zzk y59xy;um $emf$ 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 o.8dygg7 nc0y8 h-q.k gscumex2 nj-(kxmku:* n $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operat.9cvincp ,bo- x rh06(*auxdzes on 120(xb,cid0n ocpau*-hr.9v 6 zx V AC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistancq qh+1fwu.k8.ayf a(i z4kuc8 e 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up current 8kifk1z+ u hqaq8(u..fyc4aw?

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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 q4nzfma6do42fwn6b6d31wb w3 ly rr; is connected to a 24-V power supply. The operating current is 1.0 A at full speefn4;2rzoba6 3d6wm d4rn31 6qlbyfwwd. 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-V1)3zov rmd)ot power supply. The operating curr v )mroto31)zdent 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 :an x3w0i im;w5xhbn mh )-pr3primary 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 flow in the sesfe n/d: *eclyu7kpd74g wbf 68vl)2ra 6i4 abcondary64rsa*anb4)ug6 byl 28e pc /vki:f 77 dwfled. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are nv ark3;:- jkisecessary in a 110-V primary if the 24-V secondi kj;a-v3: skrary 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-tuel29rv7n2y ftrn primary coil and a 2000-turn secondary coil. If the current in7 nt9erly2vf2 the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of ax eg. /l ist)7vm4xjy( transformer. Assuming 100% efficiency, how many amps at 24 V cax) tm j4 7eixgv.(lsy/n 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 sid/n 7wehlum:cgi; ly2 )4j se8gn transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What doe)/ 4jyciew2ul: d7l;sgh8mn es the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its prio;*90 -ilarmg nnol8l w57se)dsh gx2mary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to thig5rols 9w70mlgs;-8h ) l*a neod xn2e 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 h4fqkgzsr29ky c-xt.5* 9epabo tn*k,grj7 t ) as 60 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 current is present 9er9b sy* kcz7kt-t.5f4oaq xk)gjnp, g t*2 rin the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has l6yp sdxw26qtfh;3b/ 200 turns. If the input current at the primary is 1/bdfhw6p 6 qy32;sx tl00 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turnse o +n2wdk9fr9d+o6(17t8ylxzghcaq. If the input voltage to the primary is 100 V, we can ex+qw6kxo82dhc rla yg+zd 91o7e9f(t npect 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 20c, kvpkc(xghas 200 turns. If the power input to the primary is 100 W, g c kv(k,2pcx0we 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,.* y d wgnhcl3i0wbvn )e0.p;f a-xjh 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 in 0,jw *ea)wh g vih;.pd-xb.0ylf c3nnthe secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at p)g; 1r3 7pcsut-j syy120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1y)ptucrj ys p;3 -7sg1.0 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 cun vf89x ;y+ndlrrent 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 pn y+89xd;vlfn ower 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 h p /psy*..)pxz)dx 13mtwsgjnas a total resistance of 0.60 W. A generator produces 100 V at p1. t.psmnz) gdw *3j x/syx)p70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission linbkgvu0++d g:.3j hcnte 50 km long has a total resistance of 0.60 W. A generato+dn0 j. cgu:+hgk tb3vr 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 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. alhien; 4 w4ww0*tk ,kHow much less power would be lost if the power were transmitted at 3000 V inst 4;0ak hlin,wtke*w4w ead 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 bvq9lmm9b ym;. -rtqs(e transmitted on a line with resistance of 0.60 W. To whay.b sqrqmvt(l99mm;- t voltage must 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 bb+c 5,+ xjr*fpu v5aaa current of 5.0 A. How much energy is stored in the coil's cbpau*xav5+ jf ,5rb+magnetic field?

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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. What lena obq8rtp *c (jt5s+yl2-, is this circuit's time constant?2sy5,obpllc (tr+n*jatq-8e

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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 is 120 Vol*bo - 67colr?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is t6 njz:-3gr1o iqd)cpehe peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of thtq(b 31rnq9 cl5dwn2le lamp9 clr ql2d nq3tb5w(n1?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the p y,ccw*o/7wj1 nnou, qeak current thru, jooqyw/c71n wc ,*nough 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 poweo28bf ys7)eo )llcv;yr dissipated in the reybl fo;8) lev)s7cy2osistor?

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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 resistv1nukm x7)y, yor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 5ny 89 aw4fut;hdm +vw2.pxpd 00-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 ij-yw0) 5 su rzie1b4 yxy8ng-+u2ww;dxp q.lzs $I = 0.80 \sin (240 t)$. 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 inductoqgc2t-84n 5mgsx bo +2 f5cn,djdsfl:r 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 2ab3huov 7e7 .s.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 dx w( h1bnodvx9ib23bj23 /rna 14.0-mH 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 reactaxwx kiru)qi71)f jb( r2(odc2nce at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at b1xfc3okz38.5k o0iuddfb4d a frequency of 20 kHz is applied to idkdo f3z.u35b4bxf 8 k0ic d1ot?

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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 Hzq87y+(nky 85lty gvom 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 capaciti/-ayhb(sm.p c t6,cxlve reactance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactanc2sj68mm bx lbe 7a)/tpe 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 dozjs5 e8 x;,iv)ed(qs jes a 10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 100 Wc;dic9j pj4nykic xrf.+-5- qky;p4c- +d.if9qjcx -nj ir 5c?

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5.0 V6ymxod ;c-bd( ze 3hv(?

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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 08x/lt-fxvgcnt 4qj +circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W c8l4-xf qcj+0 n/xgtt vapacitive 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 *p5tpi1ji: jks94 n(n-jjq l1isocv7*dv v1 k100-W resistor, 20-mH coil, and 1.0-mF capacijs v1i4*k* n-vs5jp lj9:1o cpktj( d7iv1iqn tor are 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 irdiwp1u yoh:s), 6ub8 f a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are cons 6ui8):b rd1woph,uy nected 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 3ds)oxu0 si8t20-mH inductor, what is the impedance at 1000 )0xotd8is 3us 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 lvfju*8)d,66 kw:m ew h)bitga 20-mH inductor, what is the phase angle at 1000 H ftu ,bjw8:id m)v h6lw*k6e)gz?

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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 seriptu9+z58id.x g; se4fozw m /hes circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at.x54me+ozwt8sg;df hiz/ p u9 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-W resiso 7be(l.vsqq k(abjlj8 d3)v .tor and 15-mH coil to get a total impedance of 110 W at 2000o b.ked3 valjjl8q7b(s( )v q. 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 ij3ua+rn.as* a 450-mH inductor at 5000 Hz for a total i3.s i*njraua+ mpedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for uaxu 4)zdlun0--l blfsfop q0,h-e )) a totah) fzell-fad l,)unb4x -00us-up o)ql 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 seri tfnv1ue if-76es with a 20-mF capacitor. What is the impedance at 17f1v-i6 etun f000 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 cap(*j. hcn tsy/oguqi/jwwpw0 u dh691. acitor at 1.0 kHz for a total impedance of 45 t6gu1 qow0w. .ny/s h/ijwph9c*uj d(W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF ca33hi8 7ygcy+gqb g eb,ogmo;2 pacitor at 1.0 kHz for a phase angl+8geogg q g;y2y3 imoh,b3b 7ce 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 withhwj ,0e0a/ixrwc fqrci63ir ;bpi6cj q* 643u a 30-W resistor at 1.0 kHz for a total impedance 3hrjqi xc0rqwi6jcer;f3 6wc,p4/i bu6 *ai0of 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-m1, 41xu3;jhip ir5ydfq/arimF capacitor at 120 Hz. What is the phaseyr/q1idmi3,;4f1 rp aihj x5 u 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 ae, cqm bref;1o,jr/o 7t 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are co1rqo,;/e,rej mbfc 7 onnected 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 1 7:v )s ;idj;ghayer0by89uyv 0.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V,bryvy;u jd )a v0ghs8;e:9y7i 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance;hws ;7tu ui( *b+bxrkfo9*om 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 6ut(w*i h9m7rb *xks+f;ubo; o0-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 series RLC circuit containing a 50-W resistlfj .yl8z.y:p5ge )b 8xbti n,or, a 10-mF capacitor, and a 0.45-H inductorb .8 :nlzg8ypyftb.j,5lie)x, 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 seruytd (q1a gjl4b;q63g ies with a 500-W resistor for a phase angle of q 63bdj;tgly(41g qua $40^{\circ}$ 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 hmvcgfq .* ;o rhrmu86:as R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in o 6vf r*omc;:u8rg.hm qrder 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 resizcg/8lq8/h4q cc l*mdstance, 15.0 W inductive reactance, and 10.0 W capac dmll hzcqcq /c8/4g8*itive 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 civ7)miq.-xew7ai-0gx zvjeu/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 ri-:h o4 (j f7;liwwm+x2ebfqW and a resistance of 30 W. What is the powe hrw4ijf:(+w miel 2ox;f-qb7r factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC c2b ( jx;th99hmoq vxp4ircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, w t ;q x9v4bjh2hx9pm(ohen 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-mF capa ).xes(6yemhbm:hu- wj 4g4smcitor and a 15-mH coil in series?esh y.m:4hj4-emg6 xw )su (bm

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is nyy7tcj- v,ayhbi1q/ - iv8,;hck b o-*l uus2keeded in series with a 4.7-mF capacitor for a resonant frequency ofh -/y8,c vylb-atqs72;oui*-cj 1vyh k, bkui 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 inn9y8+ ,d kawonductor for a resonant frequency of 9yadwo8,k n +n1000 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 aq qsw r87 m-lgovl ;lx)b7hh3( 30-W resistor and a 40-mH coil if the resonant frequ8qrg mo3xh7b-l;s lv l)wq7h (ency of the circuit is to be 1000 Hz?

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