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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 sen;h8qgq(t zn*2c pgc 9x-.g 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 indui)xm0jd sh26q ction 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 protw;4q* 6pbh,rsnvf+ 5zj3nulduces what kind of change on the inducedn, n3 4;uljs p *zh5+rw6bqfvt $emf$, 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 throuh:(ihv i9/oiajl 2 okd1vwf)9zk (r-ngh a loop of wire produces what kind of ch (kjrf)ai- dw9/hino9i o(2vkzl:1 vhange 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 onomwt+ -cr-/ tj the inducmtjcr -w-/t+oed $emf$, 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 f,02bf5g s eqhwield 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 onq 15:)rbt1 bc-qpdgqq d7z2 will bq rnbgdp5 o1q2b zc: tq7-d)1qe that which tends to produce 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 flat on a horizontal table. A bar magnet is held z88vz43 s.m v9mpim d vekt/0sabove its center with its north pole pointing down. The stationary mzzv.e v 8v9t0mmd3 4m8sk/ pisagnet 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 is held aboveh*at7: lab5 )tb2 o oy ha55jkq;x1zxs its center with its north pole pointing down, and released. As it approaches the coil:5o1bka5l5t aa ; y)xjb *hz2qhs7o tx, 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 cf 9-ggsm n+gq 0h14jmthe magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil msm g0j4fn -gc+gh1 9qas 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 ( )gq 59tyyvxsa level 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 current in this coil as the field increat q9g) y(xv5ysses?

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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 rfb dgpv+.:j5gh i-4ab y4kf7 top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viepb+dg gkfriy: 5 v.f b4a-hj47wed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasing cn3v.givih:ja p t :a nxj3u6;6qlt.( yurrent northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the:: vgqi6x;n.uj (apvtaly.jiht 3n63 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 f/)*dvp(0wm afb (vudh )bb-c+nqj y ;the north pole entering first. As the north pole enters the ((a v 0njbqh/pfb+f)db*v d-; c)ywm uwire, 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 ajca gsg03+cp) t constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field s0 cagc+)pg 3jpoints 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 whgp4y)n:c*imi nt vj 9;ose direction can be varied. In a region where a uniform magnetic field points stra mvic4pj)g niy9 ;*:ntight 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.s 7-vekpu;hm b+pwbow;+n-s+
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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 t ;,lujiwjq2y nc2m,v ;1,wh h ont5f4$emf$ 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. The vh: tw*te 3pvpdm;.y0$emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northward at cona6zi 1+ ux)sbwstant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rodbz1i+x) 6wus a.

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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 vtj sv ur7r d22wdzl9-)elocity $\omega$ 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 tvz/w3rxr8 iv; ransforms

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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 w/7txyx;ku 2*- nitmjs3oo.g;tjy)k60 revolutions each second. The frequency of the t t3ox xy/.ko*y-j sg2;n )jm;tw7uki$emf$ 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 dev sur-vxuz. ;px7 -ew6fice used 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 device thng5 +r-8mud coat

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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 thavz6s7:;bf/f ppi p fj:n the primary coil then it is b:7fjpp sf fi;/z:pv6 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 coil0*vwmp6qjk 1u-z1 9xms3 uetw contains more loops than the secondary coil then it is -0j9w6em1z 3*qxuukw1v tm psa

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, th ;dm-tj+nacne .fez ;l*q(l6 ke power 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 resonantohh-3c(-mr4jglm ( g n circuit,

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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 inducnq g /mv8efs-xzh1z - bsh-gm0v;qr,;tor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the re;; 0-1, hxveqh--fgv qn sz/srmmg8zbsistor 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 connecteji5c3fwuvd ea1 +b5 8sd in series to an ideal battery of constant terminal voltage. At the moment contact is made wids851 a wjf3 +u5iecbvth 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 inductanc6-jkdxyq9lq;s;k s3 3z8gvp ce L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with is * z,fq li7mp3:vir( svhxg+4nductance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. Thu80 duokegi:+era 5(se time constant for the circuit represents the time required for the current to reuaedu:ie sko +5(8rg0ach

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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 baudvn,-8cp2 zfz 59 amkttery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decream5-,uza cpd2n f8zk9 vse to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same 5ya3-vf *ool-:ypte p 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 ci i ;:x5tjdfj4yd(o1nr rcuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC pp-fy/b)yt;t7s ;qagi ower supply. In this circuit, the current) ; sbp/;gta7qyyif- t

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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 fahztv dlqw sj653i)4/y ctor when the frequency is tripled/hdy4)wt3vqj6z5sl i ?

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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,cdweq /,ir-r(o )l5gg the inductive rode/ r,g(5c-)qgwlir eactance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approachesmhgo, k rvcs8vdx/j0e31y+/ gtqo d: , zero, the inductiv ,eg to/cdqv1xo8s/mdkrg0j:+y3,h ve reactance 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 to an AC power supply. In this circuit, l o5rts67) q:ky bifj6j,2u4wv9ow hk the curre6v,t o6b 724syijh 9lwo ufjkwk:rq)5nt

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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 acwhw8 yk8v a-16xv :leixgsp9::xnlp* circuit changes by what factor when the frequency is triia8h v px-1 ksxgv6l:::*8ly9p wexwnpled?

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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 acreq6 k a)ba*(yzk+7pv doss a capacitor approaches zero, the capacitive reactanyk7+e vp z6*()kabqdace 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 angle between the voltages ofk)-wb te1-f at the inductor and capacitor in a RLCke)t1 tf-wb -a series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC c9mk rou:i av20ircuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circui 7 mht94k()9tez wocnst increases if R increases. Wezc(7mtnk 9w4 ts oh)9hen is 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 impedance of the circuit inc pi7lwp:w6hr7smi9h ,k n* w*vreases 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 impedanowj 9wys+q:pq pn :i 9z)ge:j+qm8s8kce 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 5q mjbp; :zbbx9t94qq; w gu8qan LRC series circuit, the resonant x:qb qwuq;q9j 4tz5bp bg;8m 9frequency of that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltag1c bm t+aa1huo:5j)o ee. 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 circuiy5*xbx/+w ixm-9zec 81 wwen zqrn *9it 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 inz2 v5oojsr*:pck bwdr :298 bc a uniform magnetic field of 0.20 T. Find the magnetcro9 * cwd: 2bvzj2o:br p8k5sic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a k .-aos/coje(x- u f8l-itg - gis9.siuniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop-s.css-i efo-gkox/ gij-li9 u(.at 8 and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform m e347bn3k jhdin8 /tavagnetic field of 0.20 T. Find3jn/ea 34vd t7nki bh8 the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustawm +-k)w.yk*ehhj /eo ble 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 cd;d)8rz ha4 ai;e-ani(y g9yioil changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frnef)6p q; owm 6*e.mduame with sides 18 cm. A uniform magnetic field is applied perpendip uwmme; )6q fe6*.doncular 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 an8+q kdtcy.0j1p 7nffl /mal47dn oo,ud an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and ze3/;b j3z)g2eym0ub y6v zkoarea $0.20 \; m^{2}$ 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 s8 a; c6otshmg j8oze33pan of 60 m flies horizontally at a location where the e o3sha36omztj88 gc;downward component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is n wp,;opxu9en ciq9 p3nhj74 :2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis throue njc,p 3 n9uwp4phiq7xo;9n:gh 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 andkth/jr8y2g5r/* fr;fu.2y )knm x yiq 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 of areenqw *dbt8g1v0oeys3j80 5 ag a $0.090 \; m^{2}$ 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 j3yyihq gpnw2 -6 aoo;nm67 i3e*jay(z- tx7pits armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generato-zwioj23-pjqiypm y hye7n*36gno a 6 x ;(at7r?

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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 tilpx ;z9) :rg)w/tho curns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to )dq;edj/z 4xuconstruct a simple AC generator with an output of 12 V maximuq)jx /u4e d;dzm when rotated at 60 Hz. A magnetic 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 ge p2 ivaeagj3)q/wnkob a if( co90d)72nerator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The moto z3yx;axx 0xd+t52 uoerz; ph1r 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 opsxwa4 / y ixg:t;q8)pberates on 120 V AC, and when running at full qa 8y/:x4ipxb;twg )sspeed 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 Wh:bz 4 be*r nmjq,eqxo5 8xr:,ft3 qx2 is connected to a 24-V power supply. Th*qbon he4qrzx: x32t5 q,xmeb: rfj,8e operating current 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 tc(4i9 vhhzy8 e6ji 2eoo a 24-V power supply. The operatio4eviey (6h28cjh 9iz ng 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 resisu6z1o 1boo1ccft53q dtance 6.0 W is connected to a 24-V power supply. The operating current is 1cqt d1fu6 311o obzc5o.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 neud e 6dqnxd4-:eded 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 to flow in the gm;(w: kpkdc/fzkw5+ secondary. /dwpzk;f g:5 kc+(wmkHow many turns 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 in a 1o*rcg:xw 6, if10-V primary if the 24-V secondary hasr:fog,*wc 6x i 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 ofn11e1shymh2)cwdegi 2 t)b5q a 500-turn primary coil and a 2000-turn secondary coil. If the current in the second e1s5thn)i w11emch22 )bdyqgary 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,a 6;fg g khu)ik*u 3l2vrdtl* the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the slri,g u ukg6*2at*vl kd3) ;fhecondary?

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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 transf mcl13byf0- wzs22u rcormer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary draw?w2 rbf1z uysm3c2-l c0

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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 60wpd4l09aoi 9q60e b ue turns on its primary coil and 300 turns on its secondary coil. o906e4 p 0iqael 9bwdu If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary :.o igmqh*6c oqi7jc44l5w d-weyy9a coil and 300 turns on its secondary coil. If 120 V at 2.0 gjcc9:oiw5h4aliy.- qmwo4 y qd6*e 7A 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 transformerxig nz(n,.y/8 wtz id1 has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expd .z/ xiwgi8ntz1n,(yect 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 hahq3u r79 w,unrs 100 turns and its secondary has 200 turns. If the in, 7wu3 uhnrr9qput voltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 2*v odd61g* i,kul y0hq00 turns. If the power input to the ld6yk**o0d vu 1qi,ghprimary 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 usual99n p4p1jf sq2n *v i6jt,1qj/utk rybly stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondarnv jq,rys9q*/ jjpt1n9 ft1k2ibp 6u4 y 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 ujgztz :;go70- ;z cjbat 120 V. The voltage is usually stepped ujuzbt:; -goz0g; jcz7p 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.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steppe8-+tdftgal :3 ;7oy zb qeee9pd up to 4500 V by a transformer and transmiqpl ee+3zbfd- :ogt ;9 ye7at8tted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance omyifxz,ii + co 6td5 ;xw ,;hqc/mf8z6f 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 ener ,/ ,d6izi fy;zo;c wxc6tm8i5+f mhqxgy 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 bhd-, q;v1zz8ze ; asef8nhc6resistance 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 e ,;c86;hqn z1zf8az hbsv-edis 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 6t* qjbud /:b3jf1c7k*dao 8r q-W line at 1000 V. How much less power would be lost if the power were transmitted at 300bo7*dq*:rj8qbf 31k /ucjatd 0 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 isy 7jv mcn2:w*m to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped u2 nw*m:c7 jymvp 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. ibu 9(7fd l-60 4zlfhrgm: ywt How much energy is stored in the coil's magnetic fieldl- w:4 6u rif(ylgtd 97zmbh0f?

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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 -fg*nq ; ilbvaiz ;/l0inductor. What is this circuit's time co;z0 ia*i; blfvq/n-glnstant?

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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 isp. vb*) p2u1l,czvk(ylgcq/j 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peak currentu va eo)9*v8opt:x4bi ui6pt, ?

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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. Wx9-kgye.c*nsbm co*y 8.f )rw hat is the resistance of the la yo-fmr nc.xe b**w.8ck y9gs)mp?

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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 connectedd(v(wk lq2 ,a-yq5hoj :( bfrx to a 120-V ac power supply. What is the peak current thryh dafr:kqxv2o(qb (5,( -l wjough 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. ( zxrn4(dol)k What is the power dissipated in the resistord ((4onzrkx)l ?

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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 resistor is m-l.4/gwvpon:; s voi $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is8m y7/e 35brscfr ry,g y8lh3e $I = 0.80 \sin (240 t)$. 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 i,4,:bdy9 k,hidbqt6 d 9o.h+mfhg qtus $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductt-(e-ecyd . gqor 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 1000 Hz :1 ilca-y9kayd* -ep 9f*4ubc +zxulc?

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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 h-+ bajk ;hmjz0b1 j.lqwf1h214.0-mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance a+xuognat:64 vxm0 * dat 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 w 3esk n+36vf 6eo5s2cgowfpp(hen 120 V AC at a frequency of 20 kHz is applie3 (6o +ko ve ge2wfsf6pps3c5nd 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 r(z h)ve:)a owucvnh69f)/icj++f wesource?

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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 k e .jw8*dzqk6capacitor 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 jw++/xp9qwx3afvfg3 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 reactance of 1200kak-/);px z* x tt2luk 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 0dzn6 b- 9y7:-c qtysma.010-mF capacitor be 100 W y6tndm-y7- qb9sa z:c?

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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 9 ss;tfnj1)xx nkg0(zetcq. 9at 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 sibn tm7nntaq whu:7) e/7)8 mmeries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.e)t wma 7b:/hu7mnin 8m7n) qt0 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 co x/2 6c/ahpfy f4wrdgm-o5g(qo s bs(8il, and 1.0-mF capac(s-yf 6s/b5oqap mw cf24rhxdg(8 g/ oitor are 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-W1)5rhlvu vqi0z8y klf+-6 e xw resistor, 20-mH coil, and 1.0-mF capacitor h0-x6li+ we1zrkfl v5 uq) 8yvare 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 sere7, x co g8ymrptwjj0:qz l351ies with a 20-mH inductor, what is the impedance at 7ox tzl8j j1m,pwq0e:5ry3g c 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 seriebc3fp(/g7v b qqau ,6e.rv)u is with a 20-mH inductor, what is the pha q3. ipv r qfu6u,bg7ecvab/)(se 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 series circuit with a 20-mH co 7huo( k:yj ;p(qpcqbhd ,k80fil and 1.0-mF capacitor for 8cdpp70j h( h;qkk(q:u fby,oa 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 resis+t0 xn rntopq.)(q,mw tor and(+pttqm)n0,orn . qw x 15-mH coil 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 must41w0er bg7d2krn: xsm be put in series with a 450-mH inductor at 5000 Hz for a total impedanbdre:snmg0k 742xr 1 wce 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 resistor at 1.0-MHz fol/a5sl + rp/d1f *c o7ivyoe+or a total impedance of 150a pyclo15l/ive *d so7+ /ro+f 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 withy ewj+92aouw ; a 20-mF capacitor. What is the impeday9eoj wu+;w2a nce 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 with a 10-6kl4v4yhwzt /bvopx-.* bs )emF capacitor at 1.0 kHz for a total impedan.-wz) lp*ovexb 6v k4by/t4shce of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1k7mgbpys:;1ai*;znd 5-u kgu .0 kHz for a phase angl uy *dn1-akks :mp;b5iuzg7g;e 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 pah;2ey 0kr*utotal im y er0kp;*auh2pedance 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-)51um-f rml g* ril,ffmF capacitor at 120 Hz. What is the phase angr5 )-*uf fi l1g,rlfmmle?

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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, any* i31esn-vvua1e 0 krd 1.0-mF cu aee* ni013r1svk -vyapacitor are connected 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 consistoa9n snbp+ ,m2s of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H is+b a ,n9pmno2nductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capack r4awp1+ p5qnpi:3wuitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110i +pp:35wk a4p n1qrwu-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-ojq hbis9w8*97 vqz1lW resistor, a 10-mF capacitor, and a 0.45-H inductor, when cooq9q vi 189 7sjzw*hlbnnected 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 resistorz)c r ctz2lg:w0iq4/ m1 zm1gv for a phase angle of04mi/1gq vwzmczc t: ) 2zg1rl $40^{\circ}$ 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 akd0hg-.( sjf /3yeclmF. At what frequency should the circuit be driven in or( a./gyks fhedjl-c0 3der to 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 circuit with 12.0 W resistance, 1 dxr a; edjf;d6m,,4of5.0 W induc 6rmo,,;4j dxf;ddfaetive reactance, 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 circuit isr43fd*yea t :ovjj.0o :hx/ez 2nhv6n $63^{\circ}$. 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 imp:rf s7ia1td0z edance of 60 W and a resistance of 30 W. What is ther 71fsd:at0zi power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing4 p 2l nm,o)gcxn.vv7i a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz po g4 nnlix.mcv, 7)2povwer 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 a8q85ttwhmj i je;.w k0nd a 15-mH coil in series?8.w8km; wjqijth0t e5

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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 se*d5kf5 h* u tpi:2b svr,rf/feries with a 4.7-mF capacitor for a resonant frequency o:*sefvuktrf *2rfbh5i p5, /df 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 3.7jm k/j k+:wujbo:xb.7-mH inductor for a resonant frequency of 1:.bko : wuxjb+k7mjj /000 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 :jm3 3.o8k9gmynkxe bwith a 30-W resistor and a 40-mH coil if the resonant frequency of tk3b :x83kj .nmo9mg yehe circuit is to be 1000 Hz?

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