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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 toxc, b24d pd8of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction t9wcm- rt.* p: hagfj5ljsr9or 1l;z.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 changwlv-yz o+ ( yw2kk ndg21h1j(ne on the induyk -2h+wd1g1w y( (jonlkvz2nced $emf$, 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 ;8nj8gu4)jll +m+ 2 hgr yxovoof the magnetic field through a loop of wire produces what kind of change on the induced o;vlj82 ou)ml4g gjnr++x 8yh $emf$, 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 diamete rne3i8m)xaf9 y5 xj inxs43*gr of a loop of wire produces what kind of change on the indunr)3n8m 35e*aii9jxfx xys4g 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 m-fwi e z- xq92yh9ytm+agnetic 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 dirr8/1fiq47cy z7g pxemection of an induced current in a conductor will be that which tends to produce which of the followin zpmqx7rf8/ 1c4e7yi gg 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 abovec p0 q)qv tk6fu7j3gs, its center with its north pole pointing down. The stationar qsc73ptjgfq, u)6 0vky 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:0u- luct/fq xt on a horizontal table. A bar magnet is held above its center with its north pole pointing dot0:uq lxcf/u-wn, 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 the magnetic field vector *8ly9z3**lzfm m9gs ; jndjzq points straight up. The magnetic fiemzj9mgqfd3l j8s; 9*lz* *y znld vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table toppqg h3nklh1k .wsn316wm9ed2 yfih43 in a region where the magnetic field vector poi4w31y1 p3f ge2n9hhqkkmn3ildwsh 6 .nts straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal tableeazxa(*50znu m 3 oyt0hf tjsy7,3dt60ial8s top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. Whi8a*f35ey0y 0(zza djn7tm txs0u3 ,hslo t6a en 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 liz 23*3tm c/i6j khc7cmqs fo+xes on a horizontal table and carries an ever-increasing curren3xcm3ijmthoz/7c2sk f6* + cq t northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole+wpd udg+wp 2q0j3w,h entering first. As the north pole enters the wi2+ d,ju3pd 0pww gwqh+re, 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 rotaterk-qt+l 1q oad.03z nkh8gh/fd at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight d -gn / d+hakoztf1khql03. rq8own, 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 spee3w5** ny nhzn2 al-sqxd about an axis whose direction can be varied. In a region wnns *h3 2 -nayqlx5w*zhere 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.0sppj z7 p)4xj +s(avq
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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 anjwrky 5 (uzo:j,3go 0e $emf$ 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. Th;jfg d 5nt(ke g).ge9le $emf$ 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 mv/2svzdmg)dx 1f2 2 wfoved northward at constant velocity through a magnetic field that points straiggxw1)mf 2fdd v2z /2vsht down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a co,bfxz-x5kuir .;s tu .k,t8 yynstant 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 transforms5/( :txw +nin2htbp)gxpcn9 b

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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 fr kww./5t/ 4,c;( q 4rmacputmccbech1 ga:ri(equency of tm:4i r,hcrc cq4agp5w c(ca/ 1twbe (kt m/u;.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 ho rbll1wg6o 8;+sj0 fused 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 dc2p1,dlgih 031. 3 wxg quebefevice 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 tf2c m-+dfk0u fhe secondary coil contains more loops than the primary coil then it i 0-fdc2u+kmff s 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 tn ,6xt8y . lc-pvhv7zthe secondary coil t6vxcl7vht- ntp.,z8y hen it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power icgbxj l :rhv 9vvc.(bq2 3o1m3mx1r0b nput

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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 circui/hd1 e:*yoo (pw+ldu zt,

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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+ur6ohl9rui is: ok8,- ok9q sf constant terminal voltage. At the moment contact is made with the batteryoqo9i6 ,su+l:rku r-9 ohk8 si, 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 induc j6ite khfb8:w(.n)hb7mc 0-0sc jststor are connected in series to an ideal battery of constant terminal voltage. Atm 6wictn-et.s :j (8f)b 07hskc0jhbs the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L andwh 5bcn; v4 v)*tvww+epy*6wr 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 resistet2y1q oh*k 6hj bi(k4ance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The knsm 9u-g: dha+ v1le1time constant for the cirh9vasmgudlk-+ne 1 1 :cuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected inkpd fb0 kiuku *q2c26.)rpsf9 series to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current f k0bck92up) *2uf k iqrsd6p.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 except:x; ( z2-7 edolnm5dzqf

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this ci ousa2ve+-vk )rcuit, 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 circui v 3s7+no/3/+5bwmdi6/ c uvvmw cfkcft, the currentw5n//s7o d3+i k+vmuvfcb3c/m cf6 vw

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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 w. kkr.fy5( 1jt;vlxf ahen the frequency yk . r1a(v;5tkff.ljx 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 across an inductor is doubled, the in7*g9ozfg1a0a ma-.ghq d,zuj5wx gk2 ductive reactance of that inducto5gj7 wkg, 9h g z*d.qaaouf gxz0-12mar

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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 a l+j8 x+o q7g(l( nucm.)msfinn inductor approaches zero, the inductive reactance of +nf) (l q+moln .u8m7sgxjci(that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuitqxe :0**p3utc(szbs dk (u;k z dn:xct5;y s*h, the curre 3y (zd5*hnek:kpb;u* *0ctxss: ;utc x(sdq znt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor whenx24kg;m:ldbg/ zr-ozt (io/m s x1+iz the frequency is tripleoi + tk;l 1bmo g:2r/x/zdgiz x-s(m4zd?

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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 a9db-svfr8 )stufw/ti6ah.p ,xp0c -v capacitor approaches zero, the capacitive reactance of9sfpp6 ,wcv stxbf d t./vh-u0ira)-8 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 i4iyxug9:o;aoxij 73 znductor and capacitor in a ao zo:yxui 7 9;jg34ixRLC series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit0pvvsef6nd z.x2og)vj ,dg2 4 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 the cix)fov1d1.g2 8jtjn acrcuit increases if R increases. When ij.c1tf2o 8) nvxjda1gs 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. The impe 96b5kmsrl1bt dance 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 circuib4q.bu u+ i4spt. 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 both d4w((cvza8i qroe m)s+ ouble in an LRC series circuit, the resonant frequencr )cv8+i(w4(zmq seao y 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. At reluw. mi29pk *osonance,

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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 ocpyv+i0ga ofk(2j+qv3zza m(4curs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magn6qhfn + (evtf8etic field of 0.20 T.68 the(nfvfq+ Find the 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 ofs,tzm80 wv3r, (wzvf*j4zf xj 0.20 T. Find the magnetic flux through (,jj*w, ztvz3w f v8fs04mxrz the 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 of; gmrq8m-cfvvi a+) qjx 82go. 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the img x28am) . v+ qc;fq-vgjor8magnetic 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 )/ s2xh-v rcyesingle 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 coikif;,r j60ct.t s:p9ljk3le zl changes 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 side27ywk2yoj/fpsd7 l6i 0 ax z*(trqvj6s 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 th2lajw p7tis *o(y6fdk0x zr6/y 72qjve 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 wito9 t 8nc9cp y i-1dnv+e34uwqth 15 turns 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 al2 ai k5 3arl( og80qqx27wbalrea $0.20 \; m^{2}$ 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 at a location where tuo k*o n3oil3/he doo n33olkou/i *wnward 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 long rotates at a conssyc 7czw)7 *ictant angular velocity of 2.0 rad/s about a vertical axis through onec*c cysw )i7z7 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 andruelyr)qbrc,w4z ad arg+7m t-7)-: f 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 ofg8*yku 4/ xr2zsp:yit 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 its armature. Each loop is mhg a lojr6r8fk6r.n rz-m*,us d :66i12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the,iausr66*g .rm8ojm- n6 hkfrl: z 6rd 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 x3 ,cwo xa,e0ylw a4*wgab8z: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 with/;d).x njvpu;;x drn l an output of 12 V maximum when rotated at 60 Hz. A magnetic field ofjuv/rddxxl .;n ; ;)pn 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 w1 /5i)-5jzixzzf9sucr iq3:cuse r8eith a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. Tsspn1 p1)(vq6*ue1tb lyb-h dy ;n s:ehe 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. ,vmk8kcmvl3.y )k)k z The motor operates on 120 V AC, and when running at full speed )m.3)zkvk ylkkm,8 cv 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 sj psjeug1/ + xgu1s0gpj0 ch5) w+t+jis connected to a 24-V power supply. The operating current is 1 jt h0)+e1xssgp0pj+j1c+gsu5 uw /gj.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a x/f0l-jjch-vmc qla7oy)8 q: 24-V power supply. The opermfyoal07jcq :-j) - x8qh/lcv ating 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 u4)f/dei-av 3z +ehdl connected to a 24-V power supply. The operating c) eeaz3i/4vu h-ldd+ furrent 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 tcv w3xosc272 fo 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 primary of a tradm mjb)xrf3j;4gn 3o(nsformer causes 14 A to flow in the secondary. How many turnsbdmnjrm(; 3gjx43)fo 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 man*eq chwnxp1h (81ova8 y turns are necessary in a 110-V primary if the 24-V secondary has 1p vqnwh(8c81 oe ha1x*00 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 8.npbdrth4 zc a697 zv2000-turn secondary coil. rzbd897ac6 4v .z nhpt If the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efficienc1gml*th.8rmns)zqc g3+wx c6y, how many amps at 24 V can flow in the sem)cg q81.6g+sl*wxr mcnz 3th condary?

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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 neov qez-1cd+y 3i* )cq,lofls+zn sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. *+ q- doy)fezl+qcz lsv c,i31 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 its primary coil anw j mnr0u nci3jhiz;,94kt7 s)d 300 turns on its secondary coil. If 127u3;)4jisich9m zjtnkr ,0nw 0 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 primary coil and 300 tb*b-oyy,,ebb*yg *av urns on its secondary coil. If 120 V at 2.0 A is applied to the pvyo*y,g*ayb,*b b eb-rimary, 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 its secondary has b4lf fb yl803l200 turns. If the inlf8b3b4l0yf l put current at the primary is 100 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 9;9h)qldqje vrql)ni 0 z+kh)100 turns and its secondary has 200 turns. If the input+)zdv;lr 9e9qi0jkhnh )q) ql voltage to the primary is 100 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 seco5x6wuu -9yy/bs (1fn jmxxg c2ndary has 200 turns. If the power input to the primary is b21x ym 6g j(w5n9ux -yuxc/fs100 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 rx75/r*gp+: ju mdg6m* lb5qoj(uk oj current at 120 V. The voltage is usually stepped up to 4500 kroo*5q( p:ljjd56gbm/u x7+rjm ug*V by a 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 A of current at 1y)jre1,l2x q,7tmj c fw,r6puc+ x*iu20 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lp,1y *x mxcqu t2wlu,6)cfj +i erj,r7ost 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 s4gd3ye m6m rhn(5;jxwtepped up to 4500 V by a transformy4(gn;3 rwexhmj5 dm 6er 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 line 50 km long has a taykt3fvay 2 5u(-pis 2otal resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns r( ya2-yu 253kastivpfatio 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 totalb2 wx7)1m y rqjqt1cv8 resistance of 0.60 W. A generator produces 100 V at 7 1btx7y)8qm2 jwvqr c10 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 transmittekj*-)w84cq 2uczlq rwd down a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3c*k cz2)uwjq8 r q4lw-000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitif:pmxu5w9g5yp - q.r ted on a line with resistamiqx-9 fy5:uwgp . 5rpnce of 0.60 W. To what 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 a current of 5.0 A. How much *s /2+shnt ovbjvxjx 81yz2s+energy is stored in the coil's magnetic fien o1j+2j8hvs*ysv/xxs2 bt +zld?

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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 anx9x-s0 bq *w mlp44itf 18-H inductor. What is this cir4qtsl* mwx fbx09i4p-cuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit wher()xd kc4v im:r,yo8bp- wu1m3 ng rgv5e 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 1s c(h)sk.: vn-yvfh0t20-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistjuvog+ 6.er8a 0b ya( eo6ek5pance of the lampoy+ ob gj.6 ak 6eer0up8(5vea?

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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 conn*;gzbhl)y tj: a69jm unj/ akd.5hy 9ehz)fj )ected to a 120-V ac power supply. What is the peak current through tt yu.a gej *dj5 9:hyj)hflza6m/) )nz9;jh kbhe 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 torfgn ue6y 3/3p a 120-V ac power supply. What is the power dissipated nyrfe 3/3p g6uin the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W ro:w j8 zwwmf93f-8n wmfyf81k esistor 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 5i o92q z ewl,.zr*yk)z0-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 b (4qbu d3(ouzresistor 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 drt9hlqdgxazu t433+ s2,et*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 h4/odsi 7qy-jtn i k907jcay 0reactance 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 1h6of9; apxwim.vbz 29v arb0(4.0-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 reactance at 1000 Hu 71(d e)(h5xu s)k8uuqruna oz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a fret (tu+p *0k 2pdz8u 4rzrlni.gquency of 20 kHz is nldr ukt* z42(pg+0up8i rz.tapplied 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-mHqkpkce 0,nb/-44 u ccfxk,-(wi ep2jl 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 of a 4.7-mF capacitor at 10rr3j0m)+ rc: 2 wbwznb 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 reactanc +oc 8p4bvo 9tie34swpe 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 reactanced6fi;)d8 yk6yf9 pmrb 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-mFxztls. 1*o78 ie dt: ryspa+)-lxicr: capacitor be 100 W?si d )lspyto7ix.8 -ecr*a1 lz x::r+t

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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 capaci2ztjm or/z/p ebtv8 *.jn7wni vn-5p6tor 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 fe.;ko.jm cs p)ziq;8an ac series circuit with 12.0 W resistance, 15.0 W inductive oe.qk c jsi mf.z8p;;)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 if a 1+ efme)b,icl+00-W resistor, 20-mH coil, and 1.0-mF capacitor are connectebe if)me+ l,+cd 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, an-e p xv:rsr)as41 je5hlw t*9fd 1.0-mF capacitor arelw- j1e9tp:)v xr5ssra4*hfe connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor i i9a28 v3o qi4u0n/evga:fhxys connected in series with a 20-mH inductor, what is the impedanca:nug2xvq/3ev f iyao89 4 0ihe at 1000 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 inbn f*sz ,spt1(i:yf4iductor, what is the phase angle zs1:psifi *n,(4ty fbat 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 in5wop5 s5qe e,op +3bce a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance53epopb+e5osq5 w, ce 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(5vcx pi+roryme7f )3 with a 100-W resistor and 15-mH coil to get a total impedance of 113frr+pomc(e 5iv)yx 7 0 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 500y-qjnq6fzej8;. gcs m785pza 0 Hz for a total impedance ofejm. 8;cq-fayp87nzzs g65q j 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 v bbg1 *1hapt6k)f)aj- c- wruzh*oz*i m)hy.100-kW resistor at 1.0-MHz for a tob)t y. -wu abg*iz1ho6r)- h1j kv)*cap*zfh mtal 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 capacitor. What is the imped8h)okwo-b .p fxd,gpk .e;mb 3ance at 1000 Ho.f -8omx b,)egp;dk.h pbw3kz?

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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 yzfbuhjz)2i6 t867ve capacitor at 1.0 kHz for a total impedtejb8fy62u76 vhziz ) ance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.h/szvp(j jh 5)i.os h-0 kHz for a phase angle of zoh hi/.p5j js()hv s-$40^{\circ}$?

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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 30bjg-n2s6jljj74 y2tw c rvye )8/8ros-W resistor at 1.0 kHz for a total impedanceby2 4cr v j28j/-rojlnjy8ts7sg)we6 of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hmhu 1s95r/rp zz. What is the phase angle?5um19s /pzr hr

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if.e;n02 yqfylh3tsjxh fd .h+8 a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connecte3yhd fehf y;l+nqst8hx. j02.d 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-tqby86uk/ yx+ c3ui5)rvsz1 g,yka f7 mF capacitor, and a 0.350-H inductor. The circuit i kg1tc36/ y57yzvyu8)xr fs,qbai+k us connected 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 capacitive read0f u(r(8gl wqwuqqjbtt-if26 ,z0 o+ctance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hzqtg -( ul60bdifuf8+q,w w(0jt2rzoq 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 anglg ) 2v0efnzx iiwbw jr)7po*4,e for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H ip r*0wj xg2 ioe,i)fb)4nvzw7nductor, 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 anhbh66 zr wifn4mxi0 71gle ofhinxw 7r6zbmfi610h 4 $40^{\circ}$ 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 = 7a,iz 8df.4 p5jgbscc 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving source,.ba4j7fsi pc8dgc5z ?

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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 resihaauz)ces/9fi v;3 k/9dsu k* stance, 15.0 W inductive reactance, andc9zk/a9) s u*h3ifeva; dk/u s 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 circu q pj7d+h4dyb,it 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 lgn;x z rd)aibtzpz5 90 j)r4:W and a resistance of 30 W. What is the)i4zrlz9r) t xa g:nb;05jdzp power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a seri )d,k9v,bdm8nzw;ir1 m awr-bh0 f-da ruro*8es RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connecd0rbw1r,dr8rh8fda iu z *,9;kobm-ma)nvw- ted 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 od-f 9 er:c4jl09.tqkmeau1 tn2i4 ca capacitor and a 15-mH coil in series?omctckfe09 qr .l49aue42 :-1jatni d

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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 sdurhn:2z zch:) ws +6eeries with a 4.7-mF capacitor for a resonant frequencz:u s +2hhzndr)ew 6:cy 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 resonaa q*wwbhn(h cek69a9 rba+4+0vl. hpknt frequewwla09n +pa94hkavqeb6r (ch *+b.khncy 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 placed in series with a 30-W resistor and a 40-mH5u,(ijb-ri4h.gfck ve 31 fcj coil if the resonant frequency of the circuit is to be he fu3(jgvib ci,k4fc.r-j15 1000 Hz?

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