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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 a uadqn** x yxhg4e;7iieq/3c6iva5 e0re 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 induction states that 77 orj4d. +yc 1tywa4+x-b2vyiols tdthe $emf$ 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 injj pwtf:b0ul+(,koz0 d 3smh1 a coil produces what kind of change on the inducedtjos10jmk + ,w0pb h3( fdu:lz $emf$, 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 througcj,m 433pr jabr 9g2pqh a loop of wire produces what kind of change on the induced gab3 p 4j3p2c9mrqrj,$emf$, 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 wqlqr ys (d7t/+* yla0f +b(x6dup.cueire produces what kind of change on the indula7 xs(t db q+u6rf.*l(/ey+udpqyc0 ced $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic fi)wnvx f8 aan/hx5e hjb12ny- 5eld 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 disg ya (ise7t5-rection of an induced current in a conductor will be that which tends to pro7is ae-s(yg 5tduce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat5v+a 6jix y. oxis e;d:w.j.pwfs2+jc on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnei a. joe:.cdvssijf ywj+6w+ x.52 xp;t induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet isp :fr 7+zgi3rs held above its center with its north pole pointing down, and released. As it approaches the coil, the falling mag 7i+3:rgrpfzs net 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 ma 366kn. 8cjqvg(5i l:zp ka;zp yxkr:ognetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induceq;(naz6xkpy: .i g3k8 :vlcj6r zpko5d current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level tam4jia v)6jq l-ds/ n9able top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from a9a4l m)-6avs/q dij jnbove, 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 8dnyn8 mu/q5p horizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induc /ydq8npnum8 5ed 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 edilamp25p374h 5 f8iae*u ggcarries an ever-increasing current p i he5flau3*287m ed5ag4igp 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 lz2er af;p mxj: n x7;+h7kftgf)d0g9uoop of wire with the north pole entering first. As the north pole enters the wire, the induced9kg;g:rfx2f jexp+d 0z;mtfn7 a) hu7 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 about an axis whosr49xz0mosij5rva x(b-e g 8*te directioj at4ovm9z5ers0x8x*ir -(bg n 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 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 wiretf 2m3qvvipd n/8wsw d2h(/c 7 is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points dt2dipmwh/3sv8nf 7wqv(2/c 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.1 w1x ,parpr)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 t)msjgr ,k.zip4-; v gvhat 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 field. Theo kiung(;c, o zmh:e0 g(5lp6k $emf$ 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 directionsatn3j6d;3lpn -gz; d+1v ks j) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the3tspvdj3 n; 16asz-; n+ klgjd potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular veloci1 brh(yy nk+b+b1t ocx9rm; e4qa*ae-ty $\omega$ 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 tranka3b hl sllezebe /pnv:: mjn 1;h07:6sforms

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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 revolutiodk9 :9)1svhz8kvt k km )vmpz;ns each second. The frequency of the k k 8vt;9dmm:pvz)v1 k)9zhks$emf$ 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 th6uaw/ (.k1.173utfscri p zf-hpy xdo

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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 thjew. 0 +lnnz,eat

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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 than thev p3: dh jmym el0oz7n/mv,;)y primary coil then /omnyzm ; y lep07,)vdj:mv3hit 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 mor, h c.kukdm;zyq 4f qq7/fi(-ce loops than the secondary coiq/;4, zihcq kmk-7dfy qu f(.cl then 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 pfxd2spamhhs.*: y9sl o +5;uk ower 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 c ,hqw4 9ogo jy2. fv1lsh92iddircuit,

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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 inductoo- x8 junlh::q 9m2t iu/jao: vujh*9ar are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage ac:a hjvi:9 n 9jqmolt2o:-hau*8u/ jxu ross 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 toqpm6s3arjy- c4cf9 g( an ideal battery of constant terminal voltage. At the moment contar(y3c -a9gq 6s4jc mpfct 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 and resistance R is connected to xp se (li/md4+ 6q(zican $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R isj)pty: : *gmfl dn zvn1e,6wo) 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 induph(bvs xhr79n3assy-t lk3:+cd- -myctor are connected in series to a battery. The time constant for-:n -ysphkxr7 + satm d33b9lcv-hys( the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The battery isjs4t xii ax ragg./fl2 d:01-h suddenly removed from the circuit. The time co ajg :fs-02drxxga 4il/thi1.nstant 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 have th yi7oj78 -4y 2u:jtdqz7jm xxv48vntve 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 cir,c).3hfp8edy; h heb icuit, 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,ha8yn*yl2mze4g n- cjh8xejih b-:5his circuit, the currenth5hc8xbznjm yl-,84yi:a eg* n h2je-

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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 gultkvcq l;pji,b :s,pi .w(0yc1s * .circuit changes by what factor when the frequency i(up.s *ji1pl.w:;c, glits vqykb c,0 s tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage acrossbpq 73 5.ch5qx)bi atu an inductor is doubled, the inductive reactance of t bq73 pc)h5auibt x5.qhat 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 induc, liz hh1hp haqh*6:*ator approaches zero, the inductive reac pli*hh *,z:h1qhah6 atance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected tdv,:v 6g xm6pgo an AC power supply. In this circuit, the currentg,m dvxg6vp:6

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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 the frequeto)q *)-t )t zq*ycgozncy is tri o t*g)z tq-*)oq)tczypled?

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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 voltag3xhl+t s9 eg3j oe:zc5e across a capacitor approaches zero, the capacitive reactance of that capacitoze3: cge5lh9+3xojs tr

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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 voltd jk5cak7k 08mages of the inductor and capacitor in a RLC series cirk 7jdkk5a0cm8cuit?

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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 bd6+cx(6txpfk da ,1zdefined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit incu26ogpwuj b-ukr( i7+reases if R increases. When is this statement tru2jiwg76k up o+b( ru-ue?

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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 tk7aagi u0 *v+hm o.s:vhe 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 seribf *bc;5zml2gzce1:e es circuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuitrar9o, )h tp7ksn-1vc , the resonant frequency of that circuipa9kvohsr 7)-,t 1cnr t 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 asm;hfoyqvrv-li: 5w* jhs3ls 13+)g gpplied 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 cie ;,wc k(;4v6zzrka6guk rsb8rcuit 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 rotating in d/f+bd lj. 6*,or:sofvn4f.nvggr a, a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when thva f /n+fblnsv:orjr ,df64g*.gd.,oe 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 unifo85vk, tb v2vkbrm magnetic field of 0.20kvv5 v,kbt 28b T. 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 0.10 m is rotating in a unifo5kb; ag smg pry30:g(brm magnetic field of 0.20 T. Find the magnetic flux through (3kb bga0y :r mg;5spgthe 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 singls od/ta*)us +wse ut09e 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 cmf:r:62dpgr f u 1e4dtoil 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 turt8ya6z.xwtb.c m isp+8 xg 6m-ns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpend -.8+mi8.watsmgtzy bx p 66xcicular 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 area of:qudgz vm pol(92s 0f+ $0.40 \; m^{2}$ 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 ab1b ul +q/:; 6lioqruand 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 wi4gyble0vm 55 fng span of 60 m flies horizontally at a location where the downward componelmg0by45ef5v nt of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotatt4bo+pemm3h1jp-ch hyk 2y 6/ es at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends m3/t1pb hopk mj-6h2yehy +4cwhile 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 cross-secti h2lh(q8 d04)*ba e4weuyiv i3mgtt;konal 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 x -o bss-l0ls*8 zq, ykatnj+3wire 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 l,g) iza;) bp a08b jebu rz.3mn)7lrl80 rectangular 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 sipag)ll)e3r uj)a0 bz8nbrbm7il;z .,de. 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 +5)-xc .z:lq ie akloeof area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output of yx a+g0(*mkmk by l2+u5r 6aesgi6h7i12 V maximum when rotated at 60 Hz. A magnet2mb(u *ya+7+ki0grgkx5s m aye6lhi6ic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator97,zochb4ul d , u.wxi 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 o5ddt5w96f :-vuuy i;va3j va ae49x ssf 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 m,2m ejw3a* :ibq7 yrsy57 7pvbht t9muq jf-.botor have a resistance of 6.00 W. The motor operates on 120 V AC, and when runninyvt*,e sum a-pmh7br bb7.75j qf29it :yw3 jqg at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V pvar40bw3v5/ wxv q o fqh3ut*(ower supply. The operating current is 1.0 A. What is (4aq tbuwwxhov /vv03f*5 rq3 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 supply. jx ei.57 axrajhs 5 -rgv.5d0l The operating current is 1.da.r5 vhrsjxe0i5.ax 5jl 7-g0 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 connected to a 24-V power supply. w h3jc xh-sd6qydn p 2,6*g2kxThe operating x,* jydhpkc26nsg2h6 3wdq-x current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to-rps *lf fxc1. 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 transf u.79ak;fwz+ 65rzol ;lmsoviormer causes 14 A to flow in the secondary. How many turns ao75wlzvo +akzs um9rf;;i.l 6re 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 m hcsvy58 kbh..any turns are necessary in a 110-V primary if the 24-V secondaryy8kh sb5v.. ch 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 prim82.fn,fpd jc eary coil and a 2000-turn secondary coil. If the curred , c8pfnej2f.nt 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 transfd3su( ,ns x+-mhngbw7ormer. Assuming 100% efficiency, how many amps u 7(3h-dgs, +snbwnx mat 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 neoq/pl1gng)d( 7myv(,n)j j ckcn sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 q kvcdg7,ymn/ lg )jc(pjn1( )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 dwn y ;+u3cv8j300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present j;cu+n3 vdy8win 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 ekqcuc/u,o :():ipcy 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 q:u,iku y:p/c( o ecc)A is applied to 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 1q l-wmpz p)f;:00 turns and its secondary has 200 turns. If the input current at theqfp;):lpm z-w 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 tranb xxln /g k,flwmb/+3,sformer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondaryb,/+w/fg km 3nxxlb,l 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 secosm;7 p2frxdk(p* 6omondary has 200 turns. If the poweks p*6px 7 ;fo(mmo2drr input to 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 voltage is usually steps*p(ddaxcp(j5 l*fxnxy lks 93j 84*r ped up to 4500 V by a transformer and transmitted through a power line of (*sy8*3x nc( 9*rjfxspadklx4l 5d jptotal resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. 8t5jtohkj: uritw9fr /1i v*3The 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 percojk ih/i*3tr t j1rv:98twf5uentage 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 current at 120 V. The v55omk31b)/omh zvy7nrl.p sgoltage 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 transmission line if the /zso) nk37.5lob hpygmm1v 5rvoltage 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 resistance of 0.60 W. n3.(let5(z ryo im wp3 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 t z((ml3nto wr.3yp5e ihe 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 li7i(i2mvi-srmrb *ijst kf35 z2q(aw 4ne 50 km 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 ratiorssq2(a 4-t5 7j*kbwi3f(mmi i v zri2 of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less powerrvl65. up5fm +u 9sata would be lost if the power were transmitted at 3000 V instead muas.6tl59rpauf+ 5v 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 tgtnaf :1pn)6r3tte / ko be transmitted on a line with resistance of 0.60 W. To what voltagf 3/t1r6:ne pa)ngk tte 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 jjbt4+e k lf,.y/8dddzm;2uc A. How much energy is stored in the coil's magned+bu.mctk;8ld/24j ezd , jfytic 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 t2jmepo6o+xj /jm n4f g d6.(einductor. What is this circdet 6mo o xne.jjm g6(fj/p+24uit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 12lf:m(w(8jm6 e (hynli 0 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 plactd0m+s6o8uky tc0ei. ed into a 120-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 i r6r4u1y yx.rhs the resistance of the layx4rhrr y1u .6mp?

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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 currdu9t rie /cg+( ;)b) t*trguqnent through the+t;d *c)ur9uqg/ti bg(rent ) 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. W t wth9d7k;4ml t-el0dhat is the power dissipated in the rte;l0dlttm 7 -4h k9dwesistor?

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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 resisto vo w*swdkf(ei,pe+o +k92o1or 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 11+ ne*ptaiu zikf/e2mj, ib6x(o;vq 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is (wfaj/s7edc;i,k a1a $I = 0.80 \sin (240 t)$. 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.sa(0 j+ mz9lqr0-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-y54b b:l3ts*1aoesn9y f mbq5 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 inductive reactance?v-l;w.* k2:bug egqtj

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is nec mmbh/fgng3g,ao1+* a essary for 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 frequeeued4w q3ds+ ;ncy of 20 kHz is applie4ewd3;du qs +ed 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 sourcx y+xn*xogkt, ;y- ul7kqg32su b8 w9fe?

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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 c.;srlgu: j*wcdv * jo0u6kh+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 reactance at 1su d0a5hkg4mx (+ wa:z0 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 reactance of 1200b .c3s,jya guck*9y :k W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor bq ,78p ajh4v/i+wamv ye 100 W?87vai j vw+4mph/y,q a

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz an(sk./m z- l84mjheg o*y9 kfnnd 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 12.0 W resistanced6,bo4zj3mpo7 /g opv kjr )h., 15.0 W inductive reactance, and 10.0 W capacih6.o p,)vjoogj zb/d374 p krmtive 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 0m q*jo/b/bjt 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor aojq/bjt 0 /mb*re connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, an,r/uc 4sb*pzzf/6 xnieruf99d 1.0-mF capacitor are connected in ur9x*zinu fb6 p,9frscz4 e//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 codok7 ,jb+.ymjqb00pbnnected in series with a 20-mH inductor, what is the impedance at 10.b,kpb00 jj +bd7yomq00 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 seriwh/z /29u c3quqa4q m c((g*tblpqad/ es with a 20-mH inductor, what is the phas(uqta*(ldqz/3guqc9 ap b/hc 4/m2qwe angle at 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 sericmozf)yhy-j9jj h2h zo6l: a li 422;qes circuit with a 20-mH coil and 1.0-mF capacitor 6j2y;cooy 9jzqm2)h f-l4 hi l:zjah2for a total 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 capacitances is needed in series with a 100-W resisto(tk-l mg6u 1wzr and 15-mH zu 6wkm1 -l(tgcoil 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 f-*zxak) aoql* fqe v,/n1*lpbe put in series with a 450-mH inductor at 5000 Hz for a total va1oqqzax /ff ,*)* p-ll*nekimpedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW ret ;csnm42d1lf sistor at 1.0-MHz for a total impedance of 150 k dnm1;4s t2flcW?

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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.d4 ,uxtg00kjy What is the impedancyjd4 ,g0k xt0ue 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 series wjflt31frx 7 )uith a 10-mF capacitor at 1.0 kHz for a total impedlfrx1ju7f) t 3ance 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 nivov5 .v:rdm0b+ hju47hl 7 w5dir22y u8m xuneeded in series with a 10-mF capacitor at 1.0 kHz for a phase angle of mh w5r2uxy7 vvulo mjivdin5 8b.4:2udh7+r0 $40^{\circ}$?

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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 w88u;; sq m5r lud.p p+ma jjms-6vt3mkHz for a total impedance of m56d- vpr8luw jtu+38;ss;mm .qpaj m45 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 120ry6no9y0kcj , 6t,9yim c: uiq Hz. What is the phase anin6r0qtmy9 9 y6 :, c,ciukyojgle?

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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-W resistor, 20-mH coil, and 8qmg yh/o81t8 ) lo5dyi, qxebmf47kb 1.0-mF capacitor are ch7f 8/o4qyb m,)oe ylbim1kx58gqt d8onnected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, eoo0qrf u u07/and a 0.350-H inductor. The circuit is connec0of ru7 0q/ueoted to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, d-k sjukzi/9t*(xw,l6i z r u;and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hr u*l;9z-z6d,xk j(kt w us/iiz 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 resistk/ )/qbyyvrmy2,co*jb2d u1-o0l pvd or, a 10-mF capacitor, and a 0.45-H inductor, when u 2/prbc0yl jdv/o-o,y 1kq*dbv) 2 myconnected 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 ph:ddi : bxe:99n4rj.8colfry xase angle of yoi:rcdrj: xl9b.xef 98: dn4$40^{\circ}$ 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 = 10.0 mF. At what xv4t) 0d5 0.ozj- g)sbim vbccfrequency should the circuit be driven in order to ha5xm4gc) .ti os dcbvb-zj 0v0)ve maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance7h zdz lij-9elz8yd-.mp2v s9, 15.0 W inductive reactance, and 10.0 W capacitive reactance,d 9y-z.z8 972zpsjlv-d mi hle 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 Athm-3g 9ft sm3-.ahvmC 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 onn6u 2vtnm 8;g,ugw*kf 60 W and a resistance of 30 W. What is the pv n6tgu;w,kun2g*8mnower 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 containp) afodoo ;2z(ing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 6 zpdofa) o;2(o0-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 coil in m ez 7n4 uttaehx.58g*ah9xf7 series?9h xe4 .m*8z 5ah nu7tgafxet7

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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 capacitor for a resonant frc ts7vv6 ajp)0equency of 10 kHvtjs70)6v cpa z?

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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 induwz n7.my 0ib5actor for a resonant frequenbmaz7n5 iw.0ycy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placeeg-o4 sy x)ja2d in series with a 30-W resistor and a 40-mH coil if the resonant frequenc 4agoye)sj2x- y of the circuit is to be 1000 Hz?

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