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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 n m)kn b6a ,:nv(wgcpm+ja*g4are units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of inductc 2fkh: h a4rrj4cdne/0ngd2c,9yx a+ion 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 g ksu,d5o1i/.dne dm2 produces what kind of change on t /kddmu1 . ond,i2gs5ehe induced $emf$, 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 thrba7r u3wzm 0)aough a loop of wire produces whatb7mw zau 3a)0r kind of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change .:oamar .n sdils*s. -on the induced .*l ar. na:-s mssdoi.$emf$, 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 fiar5 /egw)6.:ehbhl kt3o pk 8leld an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductor wio5crs1 +x1.ft6oqcm)eqo9:nx bh +evll be that which tends to produce which of the following effects?c5f vme +:6x )t+o.bcno rqhq9 xseo11

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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 horizo5edrubj+ kv i zxn 9ht291d7x;ntal table. A bar magnet is held above its center with its north poleu+ j2n7eri9dx 9tx kz1hb5;vd 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 f utq +9g8. lvt-2ipwkelat on a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it appro2el tktvq.9p+-u gi8waches 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 wy 4b 1p*x/ynkk4qh (ucpj9 ;sshere the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced currenp/(hpjk y9s4y;1k*xcbsq4 nu t 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 tab:0 rh 6awcbde8xy7az )u- :odnle 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 c: 6 80y:-ewxrdd7hzuab)no athe induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnetic field 2z o)is fs aj+a.jj ;/xb5sea3points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coie 5isx .ba2ajz);f3 sa+j so/jl 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 c+cb7rcnxh r6qs08 s- an ever-increasing curre ccrc8q h6 s-0xb+nsr7nt 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 75re av wyqutz7p)x ;.0 jdv+mentering first. As the north pozm)aptxe5d 0vuj+ 7r qvyw.7 ;le enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular spe6zqdx t2 cm1l.c3q5ja ed about an axis whose direction can be varied. In a region where a uniform magnetic field p. d5l1 3mztqccja x62qoints straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whosdrkrl id5j-zgd**05q0m n5 wqe 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 rota dj5dmd0zl-*gn *5i qqr0wr 5ktion 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.x*ha 34m0,l: dm5 p cdsmybh1s
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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 awudnwh8zb(2s1z:1j z n $emf$ 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. 7bh-eucbbi/ ns9;os + 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;;ux mix)rc;w at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rox w; mrxu;ci);d.

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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 colqmq3-sh-a4m nstant 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 transz)yr+.wyg dkcq ti uuu,+0(b:hn u.t:forms

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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 revoluti ;hj vixj2217ep5 i lw:h ffygf-k/ge,ons each second. The frequency of th5jpf kh2lxgfyjeihifv e 17-, :2w/;ge $emf$ 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 to:1bgjgpy0 1smjkx m 1;

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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 depls r/u8: /r:b0- q ydmr0pxbwvice 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 containc3 lrq.rdtyb2jq 8eh x7nz 6)-s more loops than the primary coil then it is y3 dzeqq7j8n .hlrc- 6)bt2xra

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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 loofc* jlc.znjf qaz0f :/tw)./bps than the secondary coil t/0 bffzn/ c.:wlfz).*tcjajq 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 powe 4l9 9j 8i)earlmtb3vdr 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 cip3 wo 5bq qn jisann.na97.r40rcuit,

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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 copsyw c4 b8- adib 91+h:0v/brjqxj1.m g2vapxnnected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage /0wbrc jb8x1- vmd2ay sa:ji1h q.4v +9xpbgp 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 e)b1il4tv-/u i o1mcg an ideal battery of constant terminal voltage. At the moment contact is -/ibel1u4cm gvo i)t 1made 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 and resistance R is connected to an sb g- mel u6jy.rr7m8.khil+gcp+7w 0$emf$. 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 indub 2l26 8jy ogl6qpw7alctance 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 inductti6d99j5e,5lxl fuh ,v o-sc ior are connected in series to a battery. The time constant for the circuit represenc 6l9 j lf,-,i55o9desuxt ihvts 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 *l sjxi6s guoule)*8/ connected in series to a battery. The battery is suddenly removed from the circuit. The time constant l)8xj* 6slg*eo uius/ for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following havemxae/z9+8o* fo togpqmlz 4(3 the 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 circuithwwl* ezy4(m)r.) y df, 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 circ,jzxd/ ucsg9 7uit, the currenxc /zugs ,7jd9t

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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 f ,0aiwrl0.saxnbo 8 c*actor when the frequency is tronas* ,rbx0l 0iwa.c8ipled?

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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 achn)08bkir, q+ vk5phsross an inductor is doubled, the inductive reactance ofhvphrsi0 85b)+, nkk q 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, tbs )/bol(a;)qig1 +j9ou psgnhe inductive reactance of thaqloji u9sp )b+)g1;/( gaosnb t 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 thme fw ,d9u, vy;c h)hmd.sp5)yis circuit, the currentwvd.fmdm )y)s ;y5, cehp9,uh

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactancs7(*qcsx+5tifsffo.d2 m dakn* u1r; e in an ac circuit changes by what factor when the frequency f7q usrs(is.fct2md1 d* axn ;5+*okfis 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 approaches zerakn7e(d.3sfow. rrp;o, the capacitive reactance of thatr. fea (w.s7krdpo;3n 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 t p i7)e9u;eguav *hmg8he voltages of the inductor and capacitor in a RLC series c eg9hp8 i ;*aeguuvm)7ircuit?

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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 defined as n4mci qor2zft88kzp 2/ d0 w9) jpc ndrg59hm:$\cos M = R/Z$, 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 circuit increases ifjy b7fnndf+be:o-4y8u dc5t 5 R increases. When uff-84ndebc:d57+oy tj5 b nyis 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 g .;x,jhj)uthimpedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance h4+- qpd. v;bf /sqpltof 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 thcuxte:txy .8*m g7 qk,u g o qjob1ki0op-r.*.e capacitance both double in an LRC series circuit, the resonant frequency of that circuk8 o1g* oj -bgi7tx*q :qmx.ot0,p.euu. yckrit 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 voltarfmf: v.z s7pv.qf s (t2iw2t7ge. 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 circuitzpu5f 0am7z9 u occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotat*o(c .f d/pycs hvi/,ding 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 vector are p(p/dfysv,i d o c*.ch/arallel.

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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 q /);cdf.k2hgluaz+m is rotating in a uniform magnetic field of 0.20 T.azh;)2lmgkdf/ uqc+. Find the magnetic 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 0.1x-sixzfp w : uj:l-dw6.r 80ff0 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the planefx 6rxfw:j-lf ius d:8.p 0-zw 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 adj 3j6vti 3xk5w(c aa,lpxgwpo mv3rd*9hm ) f.+ustable 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 cha;ve;9 ebikp, go;k;ppje* ;wjh r+ (rlnges 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 1 dnv7j0m ahak8p -/xs/jux),l 8 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 the inducedxjlnv,0 k/ 8h-d)u amsx7pj/a $emf$.

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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 :)i8qa)gv4 y-rekmw m15 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 ny; ,y(vqn*gkovlvzw9 v s+o2j7:3qyand area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a location whyn3ou 8es -cxg0n7j9j8 sx (fiere the downward component of thegojci3 8 e-(sy n7sux89x0fjn 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 th rg3if:7a + ywd/y*qlzat is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a veq/wy7a ly3d:ri f +zg*rtical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cro 9ea-4ibvdfwn +1wx /yss-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 10zi gf*k,ncp0+0 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. *./ilmxl. vjf65iiau Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200avuif.j6* l/ilmi 5x. 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 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 ar4,tw u3 ezk3miea $0.090 \; m^{2}$ 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 simpe4 b vxd,lv;qdz6a(j (le AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the jq(z4 l;badvxve(,d 6area 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 wiwdfo)(mpc5h2 j+ oa5dth 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 resi4;psi+aa : d sfde0d4dg6wil4stance 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 6.00 W. The motor operates o ,adinqw.wg4 /ko.tg4 n 120 V AC, and when running at full speed it ge4,qg/owaki4n.tdg w .nerates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V e bd6l(*f e0 oj*m2jlupower supply. The operating currbj(l *2jfm d*6u0 eeloent is 1.0 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 24-V power supplyl0 ,x83 b5v8s qtfaihc. The operating current is 1i0,xv3a 8fh5btlq 8sc.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 connecte ds: +hil17enid to a 24-V power supply. The operating current is 1.0 A atenii l:1hd+ s7 full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltaw dpd49rv2z1p ,zro:ay3/x fu ge 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 caus.6fr 1 k8owgtres 14 A to flow in the secondary. How many turns are in r o8k rg16t.wfthe 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 tu z3 pmsj88i8f2ne oey:; dgn-wrns are necessary in a 110-V primary if the 24-V secondary has 100 turnsm8zp -2:ieegjn3fdys8w no8 ;?

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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 9*3pzow paqa; and a 2000-turn secondary coil. If thwpap a9q*;z 3oe 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% efficien6thwau7 l376ocvx e+n cy, how many amps at 24 V can flow in the 7+6unhv a6 x7tewc3lo 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 7yat/.p7 quv;tok4 ,vd500 V at 10.0 mA. The primary y /.vqtvkuat 4d;p,o 7coil 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 on its primary coil and 6*;jg.vh/y x6bk bt8 ,f+glxbtswm/ c 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the p /gxb*y s vt68b,chtl;bfjkg x6/wm+.rimary, 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 itspr m2.utwwg.n 85gf2c primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, whatg 25 rw..c2n8gpufmwt 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 0 b,o6so;c*tdl *tpts100 turns and its secondary has 200 turns. If th0b;ld*6 tosp *,ttocse input 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 100 turns and its secondary has 200 turns. I 3.ez4ff (3-qurdv mplf the input voltage to the primary is 100 V, we can expect the -rp3.eq d(fzflmu3v4output 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 n)xi+ 7b4pme.zbc+g sturns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to .beb xm+scn)z i 7gp+4be (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 voltabt0u1 49hw,yiwgw + pd*0r tjqge is usually stepped up to 4500 V by a transfor0i4bthw,j*r udwy0+9 qp tgw1mer 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 cun u5)y 2)q.n 3:oc iqp+qqdzghrrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the tranogpi +23.yh):n)u 5q cqdzqnqsmission 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 i:q me m9 j7+8oyh( xgdfpxw/;,lh c0oms usually stepped up to 4500 V by a transformer and transmitted through a p y +h/m(:9jdp7gfeo , mqx 08omx;lwhcower 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 resistax- 9osm6q d2wmnce of 0.60 W. A generator produces 100 V at 70 A. In order to reduce enerwm2 ox 6mqds9-gy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total qvuo5n(g2ej 0 resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loq e (u0nojgv52ss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted dfm l7 d./*trvjown a 6-W line at 1000 V. How much less power would be lost ift*dmvf7l./jr 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 vuvec u6.k o93 ,0lvopis 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To c0loe3uvov u v9k,.p6 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 carrieszke p: (vv(i)m a current of 5.0 A. How much energy is stored in the coilvvz)ik (:pm e('s magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor ay0(xmxc )biz2hh94 tcnd an 18-H inductor. What is this circuit's t9h )(zxty 2bm0x ich4cime 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 py8 uh97i v/8vbvmo)oin an AC circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V(xe)zc* c vsq-kze(5j 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 rz u 1csfd3e84resistance of the lae8rcs u4f31dzmp?

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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 connectkkwo.f8 b(8ik 3d)o1ejm v q)4njx9w ked to a 120-V ac power supply. What is the peak current through the resistor)okmowvk 3w f 9benk.q )d (8k84i1jxj?

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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-Vd/ x2lo3hd a*b/kfj j. ac power supply. What is the power dissld2 bfjd/ *hx/o a3j.kipated 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 resistork qhvcs 6*v1rs4o,(wa 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 r/t q;wk cqvh4zfwz13mo/o5 w:n7ez 6w esistor 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 50ptsu.map 9.0q-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 a 9a; *pl m8v 5.lao/q r)r3/cksttiwpq1.0-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 reac;9 n(/i nig/ii 4ej ygtkdppd(//p k4pfu4x)ttance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of i(6dlnz931,*;cnhlrg u t wflunductive 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:qwnix6. ynk) 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 aj sa*0b+d ooxol-x2 )ag/e9npt a frequency of 20 kHz is axo oa-9b*)2j0sl+nax edpo/ g pplied 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,qsp2q ,3joue oxl7m5eq.; gm: 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 10 kHz?-8d 3k ugrbl3,ck(fo uaw vw+/z7dp1v

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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)n7yea 1jl;t wcdikb vi45o98e 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:vh*jq tyt 6jmf2jodd:b.3v 3 br8 :nu a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.0 s5s;ihrcx0.y tju zq5.hg7 ())ik2jp2lemch 10-mF capacitor be 100 Wq 22lt u(0i7. g).)5sspjmxh hkzrjci; cye5h?

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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 0.0v z:o .2c3aokq010-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 with :kn:7sso) yk 6iu3r:f0e wimn12.0 W resistance, 15.0 W inducto) 7i36es : ::snwm0kfky nuirive 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 100-W resistor, 20-mH coil, a;i m)9*ufy jignd 1.0-mF capacitor are connected in ser;i*9j yuifmg )ies?

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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 uws it88whk ;f4ry)sxny 588tif a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are4tyks )x8 ;nhyiw5w8usf8 rt8 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 conn2un h8nl/4ff nected in series with a 20-mH inductor, what is the impedluff/8nn n2h 4ance 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 hr8z(14z:xt 8z a hgr36w)lmvb su2bawith a 20-mH inductor, what is the phase angle at 1000 bvwrl: z42 zm(u3 a)z8ghx6hta 8brs1Hz?

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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 circuitt: a) *v9 uhmz8jxne9b with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 Hz het:9jb9m)axznv* u8?

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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 sevig(r 35wfie i.pi6peoz (o29ries with a 100-W resistor and 15-mH coil to get a total impedance of 110 zpfi6r.piog3(vee2i( 5 oi9w 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 45 ri qeu4:,gsow(braas( f) n2q5;iw x10-mH inductor at 5000 Hz for a total imp2 eiq4ab);rrfnos, q g:w5(w(a s1xiuedance 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 w,esoib(pi p2 8ith a 100-kW resistor at 1.0-MHz for a total impedance of ib,8(o s 2epip150 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 tksvcf 2- bem.-p5 jq rdl8q-n;he impedance at.q-2b8nl vk5msq pjfc dr; --e 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 series with aocuj5h61o3ue,f ka t(zcn +m0 10-mF capacitor at 1.0 kHz for a total impedance of tmu, u1k0 6czfh+oaco e(j53 n45 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 sesbyhe7 pn2pds idw.7d 7;jx* 0ries with a 10-mF capacitor at 1.0 kHz for a phase anglipw7 j7h2bnde7 s p.dxdy;*0 se 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 k4 d +d.y-qgn hv+xqox,Hz for a totalo+,d.4+ xnqqg dhxyv- impedance 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 wj x0v89e ac4ntwlwt;nu hl;+8*o dg6y ith a 100-mF capacitor at 120 Hz. What is the phase 6v4l 8xh+t*;deygu;o9nn at8 0 wcwl jangle?

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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 100-xa mi4f,c,k15m/wira e 09xq iW resistor, 20-mH coil, and 1.0-mF capacitor are connected in se xia imaxi4m 0ce,/1qf,rw9 k5ries?

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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,tm2q7 x9 frix.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz9xi qrt7 mx2,f power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an gdz s,c *9u+jj pygg1o /5( r:qbfjb(cinductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flowsjgy(z b,g+g ofps(u j9r jcc:/5b*1qd 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 resistor j cchw z:-4puc8a*le8, a 10-mFulzc8-8 h :wa4*eccpj capacitor, 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 forlpv lx-l:8s( r a phase angle o-rv l:xsp(l8 lf $40^{\circ}$ 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 = 1wj0 u.d ii)8cfosxq3 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred x sui)0q8d3. 1cij fowfrom 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 seri2p,46hn mpudwes circuit with 12.0 W resistance, 15.0 W inductive reactance, umh dpp4wn6,2 and 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 circuipkp5ss 4)fm my3h jw(/4nw2j rb 9(rnft is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. What i cjouh+vk5q-orxdj 6z*8t3i9s the pdoc-6i j+zho9 3t jqkvu*8x5rower 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 circuit containing a:0. jw/r k2r7 fqcfgyb 50-W resistor, a 10-mF capacitor, and a 0.45-Hfc krq:yb27 .0gwjfr/ inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH conej* bg4+q )06fmb dpzil in series?qe b+p 64mjzgn 0d*f)b

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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 capacitord on+3b*um*a2o9hrol for a resonant frequency of 10 kb*r2 o*ouhda om3 n+9lHz?

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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 tx6 1ke cagr96in series with a 3.7-mH inductor for a resonant frequency of 10006rgct6 9ax k1e 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 withw ezzr y c9iwc4jz)vd;u 2ziyo1+6clph,5 +c 8 a 30-W resistor and a 40-mH coil if the resonant frequency z6+yi id2+cw1z;4ez ,rh 8lcc uyv 5z jpwoc9)of the circuit is to be 1000 Hz?

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