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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 exk*pejyg(o*j;mpahg 6rt p6 1, cept

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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 inductizoj ;gx3,m s2gon 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 4wis vqwx/20jxpr o u 7))a7schtfi/4loops of wire in a coil produces what kind of change on the inducedo4fu wa/i7vx/j4r) sqh 72wtxi)0cps $emf$, 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 wirhnr9- xt29c hgrb)l5g r9( xsfe produces what kind of change on the indh)n9-rgc 5 l 9g92rbstfx(xhr uced $emf$, 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 wirekmd0 8; d75uqed u/-i pegce+w produces what kind of change on the induce /de5 m7u c-i;dw+qu0ee8pgkd d $emf$, 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 fr4,gdro1bn )3:6jbs ;b;l r(erl wsq sfom a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an ivmb-wl6 z ej;pgh8rt 1891al pnduced current in a conductor will be that which tends to produce -z mb r6palg 88hwpe;v1 t1j9lwhich 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 abogeyr3 q o5+. u;npt.uw;mnru)ve its center un wr +yg;u).3q u5nm.o;e prtwith 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 j3 w:428cmw elsp7ybw flat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As i3s7c4jew2 b :pm8ly wwt 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 wh f7t4jck wr2h3k sdd9;6 olr)2be5refere the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the fo5r4rt l)k wdskc de92 fhb3 ;jf276erield 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 le 3ml ij6;lxdj3vel table top in a region where the magnetic field vector jlj6 md; i33lxpoints 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 horil 9xtx6lnnhr/t 9)k r;zontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenltk9hn9nr;xt l) /6xrl y. 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 table and carries an ever-aip5h m93) * c4mcmcsvincreasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewedhm v5cca34i mp9mcs)* 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 w,f 9vk (arh q9g)hm2limu ;d6iire with the north pole entering first. As the north pole enters the wire, tg9 vh) r hk6fmla(dmi9;iuq,2 he 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 speed abouk (zkjwr5f;rv+/r m opcha;53 t an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the inducc5w(r3mha/p r5 ojrzk ;;vfk+ed $emf$ 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( ih2gwiaynfq5e -k/+ axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientatik(g-+ia e 5i2n/qf whyon 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. m8xjyhar a 34b03:h8cxio /sk
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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 re 3m2f axj6rp/4zo*l 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 -(wqt. fyt sl.field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward at cow. oo;ye8pf.u oo13v jnstant velocity through a magnetic field that points straight down. Make 1fyjv .;oow oe.p8u3o 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 rotatesqt8qhnq ) v wtg;1i92x;n4 qby 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 transfw 8m zg6r3c)lq/yc ku/orms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second.aynm+iu;l emr8 814p c The frequency of therleamcn 4u m iy;1+88p $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used w* ,5izbpc a3nto

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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 thfv q x/q,2o)2 4k5pweupjrbg)at

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loop 2lssii8;)t2gz *hymbs than the primary coil the2h*t2lsimiz)s g8 y;bn 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 2ywqtm(x y:k9 n+ nrwvt(l*53yvz4hhmore loops than the secondary coil theywt(*9 nvk:5v4mrhy2twyzq 3ln x +h(n 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 powerov/r 0qjs f8ej4h5ivz25ldvf xm + 17v input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant cifiq)3m6n l:edjrt. 8 krcuit,

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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 constais7rk8gvt/ i j2 so2p;nt terminal voltagei vtipog/;2kr7s 2 sj8. 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 inducto 6:x eypbljh+k2/gde5 r are connected in series to an ideal battery of constant terminal voltage. At e e+ 6k 5blxyhg:/2pjdthe 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 ind0gk ig90k4sfh ef 2ub,uctance 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 inductanceepdy. fw 4pz-8 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 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.n6e ai*0 h6bse The time constant for the circuit represents h60 b6ese*ani the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. Thl z -t*jup4t*ve battery is suddenly removed from the circuit. The time constant for of the circuit represents t jtlzv*4-up t*he time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units exce:unx,m6 lg *ocwbbe8 0pt:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the currensuj-.-k mlte:3pn fc7t

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, t nh4,z(8fwt mlhe currenwhl4n( fm,z 8tt

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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 wh n5.- zsk qumz3y: u-ubb6vg;een the frequency iszm s z-g:;uvu.q- yu65ekbb n3 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 z5g9bwb7 ; csvle.mt6 AC voltage across an inductor is doubled, the inductive rg9 m7ztbvselb56 cw.; eactance of that inductor

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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 zero, thepn hw yl6jo5ky/24io* inductive reactance of thakh/ 6ljnp4woy 25o*iyt 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 powmmzg 2ql+g -)tvv*yl(er supply. In this circuit, the currenlmglmv )-(q+ 2vgzt *yt

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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 when th* pko c8dqy+;0qf ;yzi9+bgkd (o:hqge frequency o+fgi*k9d: ybo d0zqk(h+ 8c ;pqqg;yis tripled?

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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 app6)t p4zhp6, xv +pt2 ;lnqjhjuroaches zero, the capacitive reactance of thx t6 );6vnjtpppq4z2,hhjlu+ at 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 cap:d sb.nmc*af1q+qa brt w /;+lacitor in a RLC series circu+t a ;b+.l*nb1wds/qrc :fmaqit?

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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 defice707sq vrsy5k 05wq cned 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 circy;4ud b)dv;q uuit. The impedance of the circuit increases if R increases. When is this statement true?;bv4;ydu)ud q

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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 circuit increassoi taf7 by q 7e9s5*v*d+qsbvr,e52q es 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 cirg btn,+1 ma3yocuit 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 bol(78nhu0ks 19gperh / q*b kkoth double in an LRC series circuit, the resonant frequency of that circuqkh 8kh7n b(/r19gkues* l op0it 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. Atclh +gl82 yt7q 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 when 9z yg8z ,/a3nmd0qxeu/ *ejwc

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0hc4xi3o ts2,w .20 T. Fo x423hstwc,i ind 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 oxovv * i++yq82w qyem4f 0.20 T. Find the w ey+*4imqv qo+2x 8vymagnetic flux through 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 unifncphbk6/ 32eyn (- odhorm magnetic field of 0.20 T. Find the- k3ep(on n/cb62hdhy magnetic 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 is reducel2e +7gwbxew h-syx;2d 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 /2 csm :urpq7vchanges 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. Amvu/i-aakd3k4w3uf t0 l6 d,i uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to w6a/4m30i,kdu iu l3d- afvkt0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area of i8ev ,o4blk-a $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area ic+4s y y w0 57zbmie2z:xanz,$0.20 \; m^{2}$ 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 l.4hd;k1z q qiflies horizontally at a location where the downward component of the Earth's magneti kh d4il;qq1.zc 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. 7sqgb9;fy8a,fci - jee4ptb0 0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetif47it9ejpqg80 bc-e,yb ;sfac field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectionnbzy k2cw)d, 4al 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 u.zs: t/.h qgcr76vcswire 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 rectangul3 c4dcn3re hx2ar 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 fi c2he4nc33rdx eld 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 10/c4m kqb4:bm(nsj +xo0 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 genera(tgmvsx +utp :.)yzc-h9bi+ ad hb; (uid+ii1tor with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 Tit xpuhi-h+:.i dsbzc+ vg9+)ma; (tyd (bi1u 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 gene z urwixfo-1 ,q.2 9lcnay*ay8rator with 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. The motor opera24odv64blsdf/(11ayec rv ictes 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 7rh0lqh(ce4 : 0p pfdra resistance of 6.00 W. The motor operates on 120 V AC, and when running at4c qphr(0pfl7:e0 hr d 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.qnexbxk9*6 eh- xk1u80 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up currenk k8x-bq* e1xu6nh9xet?

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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 24-V po2w5 3fqav,jw; -knmapwer supply. The op w fwma, ajq35;npv2k-erating 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 c5rm t1so6sf80fy hn8is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the back o 6sf8nr0hc8t s5fym1 $emf$ 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 0az k y0ekkny;r0,;gmo1a5 sxneeded 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 primary of a transformer causes 14x ,nf hs;rm9m: A to flow in the secondary. How many turns ares r9fmxn;m,h: 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 primary io+ teutp hx k).hmq3rp0.3 rp4f the 24-V secondaryxt ehtm+p3op.r qkh.u r)3 40p 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-t0jlp7s/ 9n2dsd e;vvk urn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the 27p/90v;dnjedslv s k 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 transformerisx( n .e ahu9-ee5pgxe5;(e )zfm7oy. Assuming 100% efficiency, how me;u)9 sepzxe- 5inh(moy5x 7gea(.e fany amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at i0/k0* ftu(s2)y4jzyapsrju10.0 mA. The pr (ks jtsf*yu0jr/uia y)2p40zimary coil 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 turns omfa;*58puo6fs so wo1u(d(7 bcp/bb kn its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is prese7kb(pf(/c obuousbm 6fa8p;* 1sd wo5 nt 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 3h-dw)/fwdpn:yquz11 4v0 jsy kcbv2,00 turns on its secondary coil. If 120 V at 2.0 A is applied tqvbw:0 wf 1)pj 2h,y dd/vz41csk-un yo 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 its secondary has 200 turns.8fihxp)f zjmb*)e 9y4 If the input currj4hibey)9f mz8)x p*fent 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 travoth71(eq( z .gp5vapnsformer has 100 turns and its secondary has 200 turns. If the input voltageetv pzov5pqh.( ( 1a7g 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 secondary has mbe4( kk/ .(rhlw.gsz 200 turns. If the power input to the primary is 100 W, we can expect the kg/h erm.sbl(w z(4.k 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 volthvi6u6t6a 5(lo qdys-dba,g1 age 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 the secondary if the primary hashs,tuaod b(- iyl6a 56dq1g6v 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 voyh pj9yc) w omq+-2gm8ltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total mgmy+ho)p9w82y cj q-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 d3h,m: xw:mz.l k1qjmc0v1ii current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a p m1ml1:dqhcxz0:3.iijm , vk wower 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 total rjek,j0t n bdyn,n 1)s;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 transforme1ketn0djn ,)ny;jbs , r 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 red): 8 if4jsaossistance 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 percentage of the original energy is lso)f8:iaj 4ds ost 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 10005qam f 2cp8v)02hkiva V. How much less power would be lost if the power werv2h0af)8q5ca vkpmi2 e transmitted 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 generat 8/l,8 pe+wlz2q zovcs,qv;acor is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission ,z/a8s+l zc8p ;v cl2w,qveoqis 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 muc u*w9qydehch) 6e q p+dk*9k5ah energy is stored in the coil's magnetdc aq*ueek)+d 9pkq5 wh*9y 6hic 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 i7+j cop iul63iq 9oq*ts this +9jotio*q37q puc li6 circuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit8ng6+a7gts -rukgmg2htmg 0.1ku fr ( 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 outlet. gr07txc fg6c 1What 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 resistarkf8 f jbg,a ob9 ;jy;3rdq-u70byo0y nce of the lam83b ;g;au j0ybk9df fo- o7j,q0ry byrp?

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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 peak cu m -w+z/akos0/keucs2rree w2/m+0aszo/ cu ks-knt through 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 c z:1 ;ec-duf.mz)jy:prcnpz9 onnected to a 120-V ac power supply. What is the power dissc1c ;e9)p .-zyzjur dp:n m:zfipated in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-Ww97hpa j-ipqzz,3*mh resistor 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 50-W resistor 1;mlai .qzimzu,;1a9n r( yduis $I = 0.80 \sin (240 t)$. 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 resistorgm26tfil 6e9b 45h qn1yq/qsurfu- af uf8d60 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 inh-: 8iyw1iq imductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH 3b68+8 zft ) w ijh4+tlyeckakcoil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactancez(,9cux4 pfzhqjw . )e?

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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 fov m+0sf* bs3jx-sqpm-r 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 120 V AC at a frequency of pf1 ,hz2 jlb*xlln l4-20 kHz is applie*4j2 pf, lxl- 1hlnlbzd 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 dug 2pgpn jx(8kei743 rw29qyrle 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 capacitorih8 :c 87.blnffn:m by 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 reactnd 3.3pjwp o49s idu1rance 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 reactanzgapaun+ 43y*ce 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 reactancesu6gzh58 -nn p of a 0.010-mF capacitor be 100 W n-58 phgus6zn?

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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 0.00m0 ux0s:4vs sunon46x10-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit vlpg(( cwd ()iwith 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W lpi)wc((vg d(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-kcnnkm( 02qo/ W resistor, 20-mH coil, and 1.0-mF capacitor are c(/o0mkcn2 nk qonnected 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 coi hp.ol39hy9t gimp7 9kb 5(gqvl, and 1.0-mF capacitor abkti5399 hyg.o 9mvhqp7lg (p re connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, whatiw:jp fdxlpa -9 )wzh)fgy54yj2r 1j m l892jd is the impedance at -ha lz2l:1 yyd))9m4 igpxw j fjdj5fj9w8p r21000 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 u,kk fe(b.7wg0 l.h oha 20-mH inductor, what is the phase angle (,h.07we .k lfobh ukgat 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a su40:ptmm*a00 ms h 4bx3iiliseries circuit with a 20-mH coil and 1.0-mF capacitor for a tom*ubi m:40p0l mhi ia43ss0txtal 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 capa 8dm:vur:vo s(1 1ygsrcitances is needed in series with a 100-W resistor and 15-mH coi(r:vd gyos v81: 1ursml to get a total impedance 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 for2, ek42 ejr) pede/iku a total impedance of 40000 Wj/u rkepe2,e 2ed k)i4?

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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 forc+cw dg 8a qx*9w5eqr/ a total impedance of 1/*cdx q8+w5 qgwc era950 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 a2-7ndybhz g8;ctirw u y.aldh-g. 2 r5ihs c.6 20-mF capacitor. What is the impedance at 1000 Hz6-ia8sdz5tr r yw;.h7- b2h 2g yilcdnguc.h.?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is n:m:v 5,/c.e jgand msd)zzv)zeeded in series with a 10-mF capacitor at 1.0 kHz for a total imp5z/) jz)gd.van :,v:sd me zcmedance 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 nn;,lsl: zbs 6aeeded in series with a 10-mF capacitor at 1.0 kHz for a phasl:,znb;a6sls e angle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30w.5y ml7*(f dz cc n*k9oso.mhk yf+x8-W resistor at 1.0 kHz for a total impedance of k o c*m.kff*oy yz87(m5h dslwn.c 9+x45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hz. What is thtmqsr69ng(3u e phase nums39 t6qgr (angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100gy., l* t(fsqs-W resistor, 20-mH coil, and 1.0-mF capacitor are connect(qss,tf *y.l ged 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,;2h arrns*6 ty a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What ir;a ry2hn* 6sts 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*ei1(9slhg5 b3 fx2 bg u;zfbj, a capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected3 bf( uifebg9xl;s2*51zjh gb in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a serivlp6p/ cle;73 nn zf5des RLC circuit containing a 50-W resistor, a 10-mF capacitd n7ppz ;3evf/n 65llcor, 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 pd kmk+)j xj jcq637rv:hase angle ofqvcm7) j36 rkjjk+d: x $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C =cun 6wv7 diugj *(sx h46)jq.w 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the driving sourh(d.7uc6s 6 xw4)juwj*vgni q ce?

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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 circuiuslh:h 8w-oh;q9m x s /sjts08t with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive lwqs 8 xu / s9-s0omth;:hjhs8reactance, 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 circt( kymz3ez7 i39sl -3vjbwc6x uit 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 impedance9wuv0(x ;vax d of 60 W and a resistance of 30 W. What is the power factord;(vw v 9axx0u?

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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 containing a 50-W resiska5ca bm1,/i qf.0*vpzn maj)tor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-H *,.1bp cam/q 5zav0fika)mjn z 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 capacitor and a 15-mH coil in seri3k s t6xxf98t9po ;rawes?xxfs8;t9 w6orak9p3 t

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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 capaciljdq+r0m 5wted0 npqg*7t41 ttor for a resonant frequencyten rdw+mp1d7l050 4q g *tqjt 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 indi+o2a:x0mx*qi ma 5w guctor for a resonant frequency of 1005o2*wixx m0:i+q amga0 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 w9u80b fo 7cpz(bzg(reith a 30-W resistor and a 40-mH coil if the resonant frequency off oc7b 9rzzpugb(0( e8 the circuit is to be 1000 Hz?

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