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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 os9 1c+aiu;b5f3mic f kf 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 states that th erxhh(-// jyy5 zn0lue $emf$ 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 co dr9bskwle k a)-w-.,vil produces what kind of change on the induc-ldwr.av,w ks-9b k)e ed $emf$, 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 o-bt*j: mqa+ cn*dxfu, rfrr /;f wire produces what kind of nb axdtq fr*/ -urj*, +:;rfmcchange on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change 4dou*s;z k. qfon the induced 4kd qos;f*.zu$emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field a, uf,.d h8zhuaw0ed9wj t9fc.n $emf$ 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 directitrdzo-1f (dk-/eho) nyw(0 jjon of an induced current in a conductor will be that which tends to produce who(- oh jt)-d(de/w1k njfy0 rzich 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 abov5azxq/rs 2))i5e blzv/ax cu8e its center with its north pole pointing down. The stationary magnet induces (whezq58 sua xrlz/avecxb5 / )2i)n 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 magn1l e5gzy z*e)nqgh5b.et is held above its centg)blgn.y 1qz*zeh5 5 eer with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector pa5,mue6(a (/ bsol coixn; vv*oints straight up. The magneticxs ;v,lv5 mo *a(oen(/6b iuca field 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 leve;aw7jc7.2g( cmwrpe ql table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced currer(mqe jc2pc.; 77wgwant 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 a7 c1h:idrqqdu, ge1 u6 horizontal table top in a region where the magnetic field points stra:1 ddih,qqe17u r ug6cight down. The magnetic field disappears suddenly. 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 kj9f( rhzr6 w vl4bj+3u-a2z ftable and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current ciz2(436 bzfkjwr- uf+av9 lhjrrcles

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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 poogke3( /8z egwbm 7t zsc./.gu:v ,ayble entering first. As the north pole enters the wire, the induced current will be (as viewgg3,subbyw eakcmze g /ov zt:/87.(. ed 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 wirackb(ls9k,3hc :.uebe is rotated at constant angular speed about an axis whose direction can beu .skcabkcb3h(,l :9e 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 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 rofy*p q/+ 71 1felyhnhq.sqxp7 q:(m + vk1sjfstated at constant angular speed about an axis whose direction ch1j*hq qqp+1l :7kns/sfqefmv (1x ypy7s.+fan 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 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.me122/ jr8mo ih8rr neft0h* a
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that an w g vo8wqjwp *,6zt1-p$emf$ 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 magneal76dnsap7 z00zsr ea 5-grq/tic 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 iu-/ bce k2 7so4yqnv2sn the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the v -c72se2ubnoq / sky4potential 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 rotw7mkd* swx3f -nb65:w0 iu1 q tgfcsd:ates 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 transforms) 1a v baigkvnesk3qb.l u; +x81h3pv1

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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 ofvss 6rz b-9zqv2:-sirsxm2k 3 tx v2q-svs b-3rrim2:9 zsksz6he $emf$ 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 usev2k9o,n6ig4u)i9t x)bj-hga mh8s (ends ca *d to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a devic9ir k xto9r/ 8x)gf6 vg(gsdaco l*bome/*w,3e 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 more loops th ,korx9wwt:;r;/eg g kan the primary coil then it is a;w: kgt;we9rgo,/rx k

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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 c k/g - nh13g(py (ubbevaqx+;noil contains more loops than the secondary coil the (xbgep+;( b1n -ukvng3yqh /an 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 powd0 yhdu +ug38wer 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 cv ofz ji6.) uf(khs0j6ircuit,

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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 sec* ewwtd: rxk )j. nuo432.n.:lvpazhries to an ideal battery of constant terminal voltage. At the momeh)2 *.3e n xnv4ujw.zadrto .: wkc:lpnt contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery o; f+qtf5zaez )yme j3r4zar sy -)3j:uf constant)e) r :feszy-3uy aa4tjf+mr3z 5j; qz terminal 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 with inductance L l f/n5-fppe j btt9/d;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 inductt-kkb9d6p,lu myo)v5 ,y9rmiance 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 ba8hrf t944wv:gfynv 7e ttery. The time constant for the circuit represents the time required fo:f48w ehrnft v4 9gy7vr 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. The battery 9hdo* ecx6n o0is suddenly removed from the circuit. The time constant for of the circuit represents the tie96xd*n0h o come 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 thoa7 q;s+ dx00z gje(eie same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circoy58v 9)gxxse.kr5-x a9mkn iuit, 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 t e0 dw q0haug;nf2s4f1his circuit, the currentn02qf a hgw edu4s1f;0

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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 facdicdmi h3ip bydgu.o* ew ..rz6/w81; tor when the frequency is trww;p1 b g* .yez.c8i3iuodrd /6mhdi. ipled?

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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 in: smvo6 i oi.b0*c3ozcin0r2o ductive reaoicicbzis0 * o0roo6:2 3vmn.ctance 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 inwd7dm3; ytnui;46w e dductor approaches zero, the inductive rw 6tiudd;e;dy3 nm 74weactance 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 connected3v) 36r on qt xis24w)htmf6gw to an AC power supply. In this circuit, the currenti tq)4w3smvhfx6n 3)wrog 62t

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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 fact4mz , ygsp: :ge25-xch3apf ntor when the frequency -g e f 32sgc yhpa:tx,nmp5:4zis 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 volelu60/jp m)ia1o2 n qtp )o(fo-vc7mjtage across a capacitor approaches zero, the capacitive rpeq7ac1 6 ml v)/(o2ionjmt-u0pjo)f eactance 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 an-q sog(eh3f 5kgle between the voltages of the inductor and capacitor in a RL k( -fq3esgh5oC 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 a7vvr;yi , dhx)n RLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. q-jys-upr,nw c /;kh 4 The impedance of the circuit increases if R increases. When is this stat/hc jkr-w q-; sp,4yunement 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 circuit in l6um8nbxg:fu a*27h 1wi b-iscreases 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 cibrgfz-lf8e d6cbyh q: h 8-r**rcuit. 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 thn ve/. oq480fcrx sbu2e capacitance both double in an LRC series circuit, the resonant frequency of that circuit 0c/vso2rq 8n. x4feubwill

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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 iyqxo ++qnv74e s driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs whe1l o(hzr tgua08:g. ypn

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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 magnett ohcprj 2/yw4 8.m3rsic field of 0.20 T. Find the magneticmy t ows8c./r3 h2jrp4 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 tw :h+nm.350 hcal9 abjs-+uwbcx,x g m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vectlchg+ :wh-9+.x 0ma uc3x wbsnabj5,tor 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 uniforik a 5fcm1c,x5m magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at 1c,c5x 5kamf ian 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 adjk 9 )9o+buzucyustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil 6.az7o;paqd*ae0dz ) c2 wlug 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 oft6 lqitk;bnwvp ) 816t8uen: a wire on a square frame with sides 18 cm. A unif;t6 )vkl8uw n6e8nap1 i:qtbtorm 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 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 arfkyp yhd79n*+v6c vh8ea 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 arevl-c e;z7. rjra $0.20 \; m^{2}$ 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 q1qrn+ k: q6m8o g)1eiin*nhxmv9p *hflies horizontally at a location where the downward component of the Earth's magnetic field is ihk+)g61o8r:n q m vnph *m*niqqe9 x1$6.0 \times 10^{-5} \; T$. 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 rotlqc ;*-p +tjd-il)6i t9wp nxhates at a constant angular velocity of 2.0 rad/s about a vertiw x6q-l- cjip9t+t ln)*d; ihpcal 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 ivyy0/ l4 re2hloops and 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 of 100 turns of wire n9so *pot6vehdc p )7;rege.)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. Etzbryowv :8 gnu9ag 2b;9zg5tzj*v,3 ach loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel v bg,g9 tn9;82jr*uozyt 5vga:zz w3b to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of a 9rq+q0uw/5uu xcxqr* rea $0.090 \; m^{2}$ 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 tommra 30fc5zgmc5:mbfu ..8l a construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If u.zmlcab8m35cr :m.5 ff 0gam 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 wib.z:d;:v dhf1zi. 1 tyrwbbn3th 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 resis,j e2xxlbwa o tz4,:(yyvb 0g6tance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6 dx+petw2f 2;o.00 W. The motor operates on 120 V AC, and when running at full speed it genfp+;extd ow22erates 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 resistancvq 8v8x- +xjmme 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is tvvmj+ 8qx8mx -he 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 connectedn uic w ;i+voo/c 2-/cy/rrml*t;:ohv to a 24-V power supply. The:rcoc;otil i- v /rh2 /u;o/ vny*+mwc operating 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 c. foua:c5m :nwonnected to a 24-V power supply. The operating cuw5: can uof.:mrrent 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 needd v8rmy9u/. 8kso x0xwaw. i/ded 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 14 A mxh,( n0yc0c-j b e7jato flow in the secondary. How many turns0cxbme,y 0 ahcnj(j7- are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary imza7a0d tt6m r.yg )z9n a 110-V primary if the 24-V secondarmd9azmt7t.zg0 y6a )r y has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn sew:t cw4n+viho cf6o+w s5y :1kcondary coil. If the current in the secondansh f c6w1:ww+civo +k:o4yt5ry 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 oxayr8-ubi7a.*li/n2uy qn. v f a transformer. Assuming 100% efficiency, hona .y* iv7 -/ xayni.8urlub2qw many 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 10. yo;b 8gt04xt1+ nqgmd0 mA. The primary coil operates on 120 V. 1dy bt n0gm+;8og4qtx 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 and 300 turnx(qw -(d+ l66ozjk/ykp-pb lqs on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present iwx kqkop6 -jbq-y(+6l/dz(pl n 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 itos*pmj1k yip51lt( -cs primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to thej5-*ts (cp11i kply mo 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 secondat c th/j3nftj78k1hjx h0gl;;bam .l9 ry has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secj7k3.x;h9l80;j/l jt tba mhcnf1 g htondary 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 h nc mt/h0,:q6( ;jwckv)lodmits secondary has 200 turns. If the input voltage to the primary is 1;dcq(lm)0 o w6tm: h,/vjh kcn00 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 hangq 21xk; w8tm 9cnafxe:a b78s 200 turns. If the power input t7bkxc nanf1 82e8;gqw9axtm:o the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The volt( 4nfs5blqp4 dage 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 turnl4s(fq4n5dpb s 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 120 V. The voltage isq2pcjq.2; b lx usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage powe lcpqb2j;x .2qr lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at .f g 1+r84ncvtnw5zya 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 n f4a+5tcv 1zy. gn8wrthe 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 xcc 0x8, jqm. wwy9y7okm long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the 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 usedmc jx89 qy0 .ywo7xw,c?

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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 tbhu ygen0 0+x:7f+qseotal 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 ratio of 100:1. What percentage of the original energy is lostu: sxyfqe+7ne0ghb+ 0 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 100)xumd 048vxb a0 V. How much less power would be loambx u)x d480vst if the power were 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 generator is 440 V at 20 A. It is 0;)nv lcd(ubp/nnlsd,wrd x:m 7*zhe ro 13v4to be transmitted on a line with resistance of 0.60 W. To what vol )uwe3d4 sx(hvnrllbc :d7rzp*md,ov/ n;01 ntage 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 mucf cliz4s:e 0tw0+pga 1h energy is stored in the coil's magnetic10+tf e 0is4gp :wlazc 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 is g;5d3f4) mvs*gw r fqhthis circuit's t)ghfr*m4;5qfv w d3s gime 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 where the rms voltag/ rbun* nfdpb ,lj8vq:46ra (n:tf:wr e 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 zy)tv. x/ xot 9tmji :7bf6rudb0d7 -a120-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 resisqcyrtoo03l) w (vwf; *tance of the lamwo ;0lfqto()wr y* v3cp?

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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 12rij1z +/i mtcyutjsfio.q(+. 9/2)geq zh f ;r0-V ac power supply. What is the peak current through+ozqfysiu+1 ce j9gjrm/z; ). t.2qii t (r/fh 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 powv r1 :t8iyb4wl sx,i0eer dissipateb :vy,i iwt8lxsre04 1d 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-W resistorx73m;yhcc yn.a. c/q3jui,pd 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 resistk ;m o0hrbp +xtkgxtt-z 4t36)or 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 50rt6dka 7 r7 k8lg-la /nh0mu*p-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of cv;pkk;yiw ;*a 1.0-mH inductor 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 coil at ,jxdwh5h w:j4 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 22; .jz d4g-;jn 6x7tabt7to3prfnc hanu,yyreactance?

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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 H gc iqa -*6l6aaxk2lzmqos),a v z383lz?

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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 )*s ;a2s,wbb:sy3eryq hk ; 4;npk fam20 kHz is applia; )yes4;pbn3brkm*:hq ka2; wfs ,ysed to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz b, s3+ jkyz;kqsource?

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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 react4smp2wrt8. pd ance 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 is28 grs t)(t x5:ldi1 xde4mn3si7hcq+i km in7 needed to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a react ca z8.1gci ll3g3)j(pxtf6pdance 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 reactance5jq ,qcso7rw cxjn3f7 myw424 of a 0.010-mF capacitor be 100 W?sq4mf7cyx3c qw 5j ,n7wjro42

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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 capacinz*a9a 3/d grbtor 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 circut1-/yamjh2 dx it with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive r- dj/ax ym12hteactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and m m5* nsh*qa,bh4(ryi 1.0-mF capacitor are connected in sm(*nhryi4b5 as q*,mheries?

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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 coi08 :nbmi bossah-2s-nl, and 1.0-mF capacitsnb8soi-0 sab2: -mhnor are 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 ig0mosl f2+ j.jnductor, what is the im s2m+.jfg0jol pedance 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 connec dg *s cz 7lp/r w3q3bew7i/ynx59/gvwted in series with a 20-mH inductor, what is the phase angle at 17nq/sl vpcg/*9 wig3/xyzd537 wre wb 000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-hbm8h .,o36 zf c 4k4)2vwqgt-qmrouomF capacitor for a total impedance of 100 fm o) -o4zwc ub46.om8kvtq 3r g2h,hqW at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with ar5(ue5qt3 su o 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hz5utoer5s 3(qu?

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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;rl( oc-prodl/g,m 4c in series with a 450-mH inductor at 5000 Hz for a total impedancl/;,rmcd log-( rp4 oce 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 *yef lru+s -t-hgn37kwith a 100-kW resistor at 1.0-MHz for a totr h3s-k nglu7-yft+e *al 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 seriesodi .9+kin28pbzke 3fcdpo /2y 2w/bp with a 20-mF capacitor. What is the impedanc+2pp / bpobfni cwzyiek d3o9d2.8 k2/e at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in seriex2w:ac x.:b gks with a 10-mF capacitor at 1.0 kHz for a total impedbcg2x .::xwakance 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 at5 dmbw3c7h-cf 1.0 kHz for a phase ang-bh3cwmcd 5f7le 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 30-W resistor at 1.0 kHz for a tota9ax:4e wp b,afw9a:hlvx;2url im9u hxaaxfb w: a,lv;pwe:4r92pedance 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 Hz. What is the 8uz;4z(k1avs/z / lgnvz eg2zpha z;v/2 8v1g z/uz4 (szznlaekgse 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 anpwts: 85pjko -o (ctm0d 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in 5(-0kspt t8:pwjcoom 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)m3 ;/axz ougt.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz powet /xou;ag )3mzr 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 capacitivfreul 5 pcfk5g-g-wb9v08s8 z e reactance 30 W, and an inductor of inductive reactance 30 W are connected in fkg 8 -b8pfwzl9c eu05sv -5rgseries 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 series RLC circuit containing a 50-W resistvt0t/gzc6 f -z6 )eqfkor, a 10-mF capacitor, and a 0.45-H izct-t6e vzkq /f)g06fnductor, 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 re 7af*fxp u3k-esistor for a phase angle of ae -f3 u7p*fxk$40^{\circ}$ 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 = 20.0n.9 tds;hi p.g W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to 9psdigh.n.t ;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 ci c2ow1 f,gmkg; in.0y vr45ezjzgf ;i,rcuit with 12.0 W resistance, 15.0 W inductive reactance, and m;y5 wf, o0.ig1k ,e; ggizn4j2cvrzf 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 A6sun r3-k.8xgj,k cz mC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistanc3 u4b4t5xx rd7c. dyp(*jzgd oe of 30 W. What is the g*r4jx 5. uc bd4dx3td7yop(zpower 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 circuit3 b 3rex3ch)szrik mt hslo3:x5l.: q6 containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power sup lrbxc)3i3hxs6 3oe:3trqmzk.hl :5s ply?

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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 fro0 r4dp)x yf)mequency of a 1.0-mF capacitor and a 15-mH coil in series?)) pmdy4f0xr o

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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 seik+n6 n 4i*z9q5md sidries with a 4.7-mF capacitor for a resonant frequency of i94im6zidnqks 5*n+d 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 3.7qoj8tupwbf ( e2+h1 y.-mH inductor for a resonant frequency of 1000 Hptb of128 yqu (jhwe.+z?

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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 placeku.4zk f ufqkg7v jnxc :69(4zd in series with a 30-W resistor and a 40-mH coil if the resonant frequency z.zukkvq 4xufg9:4c7kfj( 6nof the circuit is to be 1000 Hz?

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