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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of;v .;u olmd6bm 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 el+q0n6we7yfthe $emf$ 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 w gycsme:om33m4cvjx- b;1 jw 3ire in a coil produces what kind of change on teg3b;sy o m1-cm3j4 cj:v w3mxhe 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 through a loop of wire prou 16enpz7lln0z bi30*) jgw e 9yd7rvbnz*y h;duces what kind oh 7 b 1 pdn 0l9r 0ueyjglzw36yv*)zien;b7nz*f 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 on theo1e t;,2th,xqf j,xbj inducede j,1t,qj bx;x2ftoh, $emf$, 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 magne/da8w7kw 2yba tic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in ivr tr wur2*jh8,z8c1n0 q9wq a conductor will 8 rrht,9n2 i*qwu8v1q0rjcwz be 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 flwirv. itz:d6.l+a9i fat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when view. il6+d :i9a zrwfti.ved 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 isxodjlo -n4gt50 3x xvu;uofn.zr s;85 held above its center with its north pzrng4;f0 unjo;dxox ult5vo .-5 x8s3ole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a ta56*vxy9q6y uxij jo8f ble top in a region where the magnetic field vector points straight up. The magnetic field6 ivxyyu86 *f5qxjo9j vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a regjw *) x lnd56r,3t- adjo6kdasion where the magnetic field vector points straight up.ad *5odl na) 6r,3jwtj-6sdk x The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region whef+o 28rvyzwykks 2du*1 7a(c dre the magnetic field points straight down. The magnetic field disappears suddedrdzk 2wo2yfc7+8(vsk1a uy*nly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table andep zhsk4z8d*k8n(d0 p carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced p8p4 (*hdzz0 kndkes8 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 a j6yp 3ck.jh5of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed fryh.a jk3 c65jpom 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 akz) .vfru1j)jbhixj*jx04+ i xis whose direction can be varied. In a refh*buziijr.)jjj +0v4 x) 1x kgion where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant an+9sr+g j6 p6r-v jg,dqwa um6g49m-rxk 3ylrpgular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rot9 j4d k6r +ms-g+v,-rgra p9g qwy6lur3j6xpmation 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.eva) ed):y8kk
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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 thatr(q-vf c. t.hk 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 feli 2r h1x9f 1l9)stitield. 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 northwardp tuz,f 1tvd1o i,l/1g at constant velocity through a magnetic fieldut,d1of1t 1pi/v, glz that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angul:h) rxs.f,3k 1vn0f: nccig jqar 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 tellu*u*5woxjb) 8; 5j ajhxs,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 throu9 n0zx(a6tzki p ,r(hdgh 60 revolutions each second. The frequency of t(h,t6d0ir9 zz ( xpankhe $emf$ 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 i tr-qwvw)4g l10m/y/: md2;fxcrnof i*hcw5used 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 dev n1u r1 glpq+rz3r6; c;drda,xice 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 contain2u;zzo-m p 5,srj0itus more loops than the primary coil then it 2szuu-tio0; z ,5mprjis 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 more loops than the second 4hm1qdvi-6xjary coil then 6m v41qhid -xjit 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 sz8k(b jryq**r 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 resonank. 6ll )w7qkxlt 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 inductor are connected inb0 o8k 2bx hgag3:kv;j series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resis2k : xbv8kh;g0 oba3gjtor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of mwhllaa677-;kiz b dq/:mq n*constant terminal voltage. At the moment contact is made with the battery, the volthil d qqnlzm/6kam7ba*7 ;w-:age 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 connesszl,i z yglz.)n*b6n98 r;e rcted 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 in fhkwj(v9fg 7z, 9tzd:ductance 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. The time cf njw(8a9juwka8h +h :onstant for the cijkf hj(n+ah8w 89 :uwarcuit 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 bzn;e 0*3gh koak (pd6yattery is suddenly removed from theapz g6(k 3dh*k;y oen0 circuit. The time constant 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 the same uhjhw3kbkzz 7sq mj8 u61sz;6 ;nits 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 circuit, theaoz 6lizg4 3.f 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 connecte pt1b xhz6(fxd4x7k.c d to an AC power supply. In this circuit, the currentpx 1t xc4hkbf. xd6z7(

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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 chap/lgzh q *+kdmzny**) nges by what factor when the frequency is tripled?q g**pn* lkhmzd yz/+)

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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 twxq++50vb-n: an o1p4ishxgacross an inductor is doubled, the inductive ri+5 :nbqx4s xgt-vo naph w+10eactance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zero, ttf jmhpj 1:i a,22ug-she inductive reactance of tha2,1u :ai j hsfg2mtjp-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 s8gaa rc 0p+3;n7ktmopupply. In this circuit, the currengnoa;c k8r73 pa+mtp0 t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance in an ac circuit changes by what factor when th z6psc+1nidmp ;ctf7bx)g 5*w e frequency+xb f1i) nwzpc*7 gd5t;c6s mp is 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;w ,bk6hojd :n a capacitor approaches zero, the capacitive reactance of thatb: hd;w6nk,oj capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitor i-dwkpgnu .ltbpqbv +2(z3) 4tn a wl3d+p 4.g ktp 2ub(t zv-)nqbRLC 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 circuit is ds u(b-4gsjrgh*b qf 49efined 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 impedan e +cpd z8v2/m)/lqrskce of the circuit increases if R increases. When is this stateme/) cs 8l2vm k/dpz+qrent 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-ujj6ybae ;z) 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 circy9wo9a .2su6+bz2 bf5nual tx uit. 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 circuit, h4fzgn i3imu8v) 3+,fnf+wtp sx+z5 cthe resonant frequency of sc5u3 )fv,h +fg z84f ninmxiwz++t3pthat 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 voltage. . + crjnl d(/:c+luasiz n7k,n 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 R:zf00evzw t3 lm4 bk)7jragl8LC circuit 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 a uniform mag;ow- ej gj 4; f;kg5 hgb-c9unkw42mlznetic field of 0.20 T. Find the mkbnj9 w f4-egggo;m -hj;; w2u4lkz5c agnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform mpb7 0qj3m2 b) (antnzragnetic field of 0.20 T. Find the magnetic flt 2 armj03bzp)qn7n (bux 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+ qaoqjqq- -sx tz 9.m fsibo,)+/y0hh a uniform magnetic field of 0.20 T. Find the magnetic flux through the xqysjq0f oh+)t a-ib/-qh9z soq+m .,loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single /eg,u q4ieys( 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 chavml,jrf 7bg3v2 n3d3 fnges from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm. Am ji6wyjx4se alr m;j2o0:2)b uniform magnaj o2;r 6mi)lb02 j4j xyem:swetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area narrb0hc3 4 ;svm-1wu 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 az5,cfm/c3copo m)o fs,xxcl 4,04 r xyrea $0.20 \; m^{2}$ 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 wher91 *psq pwrtz,e the downward component oq9p twrs1 *z,pf 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 rotates at a constant angular vel./vrkb rt06z (njduh6ocity of 2.0 rad/s about a vertical axis through one of itvzrj .t6(kr 6nbd/h u0s 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 crosbgzq6g,da/: do ::sg, t+jwp fs-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 o bd-. c*lp3 e5v6zajrof 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 cdkx ( zm:vy(o2jk:;i 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 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 thi2(yzjd:m okv: k( cix;s 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 9u*g3b2pw hh/6nrvyswxlw +) of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC genera*qn.ku :eby+g tor with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area obe*y. qu+gn k:f 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 generati par; 71 9wi93wjgfbxor 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 motge-hvo ,3r6hh o l6m)aso2 dg(or have a resistance 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 b8i3j dp 1to6 stld64sW. The motor operates on 120 Vtd 6o83l1d tj bps6si4 AC, and when running 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 re+* zpxw8- kk h7vz7hhysistance 6.0 W is connected to a 24-V power supply. Thekh8x whhp+vy*-z 7z k7 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 to a t6b*rc rzp i+t73 da5k9t e8kf24-V power supply. The operatrd+zati*5r7 t9e t86kp bc3fking current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. q:f5o b38zh(. ooqizd2y9 tsn The operating current is 1.0 A at full stzo2 sn3q 5 zoq od(hf8:9bi.ypeed. 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 apui 3 eyw1o ( oyum5z3ve;0z*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 asos.cb k9+ujav) f+ :x/uq y)of a transformer causes 14 A to flow in the secondary. How many s u).aq yx/: cs+ bj9+uv)kofaturns 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 110-V primary if ,vzm5 3stps3h.yn 3qz the 24-V secondary has 100 turns,.vz3pt m3hz qs3n y5s?

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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 t2p0l xgvx*r9wsw 34qjnh02b- ykx s *500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary isjw*xsg-rbp3 wy942* k00qt2ls hvxnx 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 10qwaay5o+pj/ . 0% efficiency, how 5q.oya+/jwapmany amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V atii,txdl7 ./o *s4js ds 10.0 mA. The primary coisssjdio /4x, t*i7ld.l 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 300 turns on its seco kcucn9hre i8:s qn*0maip.23ndary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in t8ie.usick9r n :3n2 hmaqc*p0he secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil an25 kdgvc py.x2d 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is prky2 .gvc5pdx2 esent 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 han* ( xqe3gtk/)b xn7f.p:l5lct2p esis 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can exli cnx qp pk2 xe3e7f/bsnt:(5t*g.l)pect 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 second39 as- i6t-p nnt9jxm0t gtn,2urgg;nary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary -m ; 96 inntt23ggta,j0g- t9nnp rsxuto 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 turnso+ljda +f ap5s)zf2;y and its secondary has 200 turns. If the power input to the primary is 100 W+df; o)zjlsy5 fa +a2p, 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 a 46*f zka q3x)yhlnyk6t 120 V. The voltage is usually stepped up to 4500 V by a transformkz4*yaf63 khyln)q x6er 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 current at 120 V. The voltage 8:n 8fxy oxfpl.ue,q1is usually stepped up to 4500 V by a transformer and transmittexxp no,1f f8yuq:e.l 8d 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 s/th7m15p: tfw u ceclr4fs1b/9 dv2aptepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find 9:rhf5/c2 fpwebsup4c11/t av7mtd lthe 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 reh ot9bdf77k 2nsistance of 0.60 W. A generator produces 100 V at 70 A.bk27d nt7oh9 f In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not 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 a ,3ntkxb,w c) z*br1 ;ctb:jvlong has a total resistance of 0.60 W. A generator pro:b vjkt;rw*,c n zcabx3)b,1t duces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is 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 lin p(vo /9dg3,sih6s)lfnmg qk eawkv1 2vq :8s*e at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 1e2mg q:6( g ods,vv8vws kiqfk)3* h9/lanps1000 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 tabnjp2q l6xtb/ ozx+: k-a6s0v9- bzwo be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transf zlaoaw j:vtb/z qn6-xbpsx-2kb 06 +9ormer 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. Ho,sq,n 3fq nuib kct1c,q3c(q, w much energy is stored in the coil's magne,ks3,,b3q q(cic q,uft nncq1tic 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 inducto*g1n schn0 v4vr. What is this circuit's time*v vscg 1nn40h 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 Atfnqb 8y,p4(1,qtuiq C 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 1 5dsqva 6rn-7x napn4.u,2qkl20-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. Whav./1xs nuxy eh )3fkl .ao(8gat is the resistance of the laxe1g/vo.l3x)af n 8sh y .uak(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 connected to a xwnha4d+ )u(k dna.6 v3xlcuj 6zad9:120-V ac power supply. What is the peak current througnwu uk4 lj9v+ nd hx z)66(dcaa.a:3xdh 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 pow9wj o:c*sgwgzn2m1 : uer supply. What is the power dissipated in the resistor 9nowg: 2smj*zcgw: 1u?

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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 7 w aj0ipdq3qb,+lwyjg o(26rresistor 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 d6 da hny,hg ,2bw9ahu 4ej2;yresistor 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 avjvv-(2niya k.-uy a-b 1f xc+ 50-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 reactanc hbzlp3 )3xzw ht3e01xe of a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.t surn d1hxur*901s g250-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 wi*d:h-fm+eud8n-aogm cz f7q 5ll a 14.0-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 neces /gf3-b(lmbltslm*p/ 3sj- nwsary 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 a1 *n74rksnrb9 kgqj9*lrj/k u 60-mH inductor when 120 V AC at a frequency of 20 kHz is aprk1jb94knl*s qr/jrgnu7k 9 *plied 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 t1 ey1/ zv*beato a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-m(x(hmmf( )k.-aho1pewa ) fydF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W o7n,rvf8,zd ,8abh,ww f 8kga kf 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 capvoj2k:t .;dway*a- twacitor have 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 will0e; gakdj c 7y24 xkfq*.cgif: the capacitive reactance of a 0.010-mF capacitor be 100 Wkfdq*x2 0 i7 g;akc.efc:yg j4?

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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 112lnqonvm)3;0pty)h dg dv, f000 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 ovq93cy 3z 7 iwey.t xa:;mt+snf an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, acv7ay s3;: ntzxm eyt9+.i qw3nd 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 (7i r3tc6oj h7yc,(+v5 en iwbi3kdsla 100-W resistor, 20-mH coil, and 1.0-mF capacitor are co wl 37jyskev5+rbtnd io( i( hi37c,6cnnected 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, and 17 a23*o :rotkhmd-mlg.0-mF capacitor are connected irk a*m-gtdlo:h 3mo 72n series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH induchi 5y(qq/ h( dy(syp3ptor, what is the impedance at 100 qh (dhy psyiy(3q(/p50 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 conneu c1s4+ao x-cgs a2d8fcted in series with a 20-mH inductor, what is the pha- x+s8 agfccu o42a1dsse 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 coil and 1.t1og,v m 8:vih0-mF capacitorgim t:ov 1,hv8 for 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 ibg ,p)a4m ,mlcs needed in series with a 100-W resistor and 15-mH coil to get a total impedance of,lm 4gam b),cp 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put i+/p6d zpa((*hg bfmy9paz)yo n series with a 450-mH inductor at 5000 Hz for a to yp(*/ apfzzph oagmy9)bd(6 +tal impedance 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 serif5l6:m jzqny*+.kzj -zvdih( es with a 100-kW resistor at 1.0-MHz for a total k .+z5lji6z( v*m:zh-yjqnf dimpedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in sef0beavmh j9rn- u( 35l5l ki3wries with a 20-mF capacitor. What is the impedance jei(- u9k33 w nalh0l5br5 fvmat 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 ags:01n(cwno+ qum2 wwk)e q/n 10-mF capacitor at 1.0 kHz for a total imnws+ )n 1 (2g qnowu:qwkm/0cepedance 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 1.0 kHz fkp w-j ,)nnm;0k jue4sor a phase angle of ,m jnj) 0-ps ue;4knwk$40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is neededunnw ;llb k/ .enf70-q in series with a 30-W resistor at 1.0 kHz for a total impwlnf ;nu q./7k-0l nbeedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor at 120 Hzsnjinic.4)lh3e 0l:h . What is the phase ns3lc0 :eiih)4. jl nhangle?

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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 ve,7yot 0 fton16d d 2iy*f;cv1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connc y10 yo2dev;f6nttdfo v,i *7ected 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 resisi5 bf5jfh8gmu+o 04d otor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 600mugi5hod5f8f+ bj 4o -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, and an inductbjc4k8ni .pe 2w8j5 mcor of inductive reactance 30 W are connected in sencbe.ic84m8 k2w jpj5ries to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resistor,; 8 xxsvil)kzn1n9g(y a 10-mF vxl9sz( i g8)ny ;kn1xcapacitor, 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 509mrng ,bveb ,c0d2uev-wp19c 0-W resistor for a phase angle ofm0dc pg-wre,v 9v2e,b19 bcu n $40^{\circ}$ 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 = w x+e,d)-sdm wut3yw: 01 pbmp th:n9w3)szpq200-mH, C = 10.0 mF. At what frequency should the circuit be 0)spwq9ueydz ww mb:33,+nm p xdt wp)hs:-1t driven in order 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, 15.0 s57 p b+nu 2cpuvve.r9(gv ks9W inductive reactance, and 10.0 W capaciti vru(gnsvu5p2ke bp79s9v+ .cve 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 is jc); qr-puoy xkd32p/$63^{\circ}$. 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.t7u1p0kg, 3ozi*eumhlbab d ws*(,8r What is the power,h7 or pl s1w0ebd( b3u*iguakt,z* m8 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 ,audm0j gzyr8 x/k08mfor a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connectedarx8k/u y08 m0zmd,gj 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 1v3u uven 8dp-dkd-7i1i m ov*:.0-mF capacitor and a 15-mH coil in series? ieuodpinuvm 81-v- k:vdd*37

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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 s bmdi* hc5ntop o+-/t6lkb)7t eries with a 4.7-mF capacitor for a resonant frequency ot7t*hc+nokb 6l)d/ bio pt- 5mf 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 seri3,v;8yq*9 h pa e t1hrsz4rivjes with a 3.7-mH inductor for a resonant frequency of 1000za*9jyrish1h ve8v;r t q,p 34 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 with a 30-W resistor and a yefwxn 060ue 50+ wlma40-mH coil if the resonant frequency of the circuit is to be 1000 Hz?0eu0w 6w+en fla 0my5x

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