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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of mags yu),u(k-zejykym 4v )jll:,rm7oi6- n3niq netic 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 thakle) f53d,o jat 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 produces whej3,z u o:8c(q2y ixsnat kind of change on the 2:so 3 ( e8jiu,qyznxcinduced $emf$, 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 wirex(d/ :vqfj5 , nyr7pie produces what kind of change ei,5dv/pr(7yxqjf: non 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 produce waz+e5 az.gkk*aox;7s what kind of change on the induced.a +a k5azw;e7oxgzk* $emf$, 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 magneti .c:/ mp4*dray.b5ulapd bye3 c 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 curreh+60wliz8du.5)x0i cvk z d:i u ddsa5nt in a conductor will be thatid h+i5i)u0ac.8 :zdd5d0 wxzvl u6sk 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 horizowqhrk6 gv2(;)cfq2 jkntal table. A bar magnet is held above its center with its north pole poiv(h2f)r6 jk;kg2 cqq wnting down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat ob6,oq+e k p fwcb0xypvn+0h5qs9 ;hpk*2a5gn n a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet w*x;nkbg6h+ k5a0bvpqq+ y2, 0pnsh 9c5oe fpinduces (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 whero-fomi x+ 6+ss9pb t4u :3i3ivhhdw8 oe the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced currf 9om4ss h-38:d+i bpoutoiw +v 6ix3hent 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 region where the magnetic field ve7tarf 9m ) /uqzm0jcbg9)9ori* s hjs+ctor points straight up. The magnetic field suddenly grows stronger. When viewg uss9m)*i9m9 qj f)0abcz7+rrt/jo hed 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 holl) c)c tiob;me 9u6yn)zm77prizontal table top in a region where the magnetic field points straiye)u);bp cl7679mt)m l nzoi cght down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasing cxstx -mi6o3 pgl:2z09 m6kmuturm :st6tk2lmg upm 96x- i3ox0zrent northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the5ky z ps8tc:ttc/wffa ( -sr-: north pole entering first. As the north pole cf -p:y(kz r a/-w5c:ss tt8ftenters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axrj.pc1m* a 1xiis 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 .cpm1jx*ari 1 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 abo,:g5htl 0m: uj/4gdy/ xmvnfqut 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 rotatio0ntugmlh4fy,j g/m 5v/ qx:: dn 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. p:di+ib-z7ffj b):wtcgp 7 9v
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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 thm 3n zs a:6l5vkza06ahat 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. The rg-hbt)3 xz. m$emf$ 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 northwz5ilt5nt1sn . llg;d:kr3p:m ard at constam :tlnnzk5.5g;1l i 3prtlsd:nt velocity through a magnetic field 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 ak);l *fc yw4 .tplxrla2o45td54wsrv ngular 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 transforsb1u4lz*j88 hgdtwl * xaq90ums

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rot(1 120e(sj: rto(uekh c:dflon ztzm(ates through 60 revolutions each second. The frequency of thkoe(o(r01u(h :ntjde f: zlzm1( s 2cte $emf$ 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 devictg0m1e 6q,wmx qfxs- 8e 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 deo/9lc ajp,h 2wpa/y 0ywwl hf v9k0(r x:,4eepvice 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 c bf no-9maa(,uoil contains more loops than the primary coil tho9mu,fbn(a a- en it 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 more loops than2n5, ln hgxj+j the secondary coil then it nnjg5 h,2j+l xis 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 power i /26di- wkh:im,r xtfxnput

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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 resonasm h.n mhq, zyrt.he /rl,e.6.nt 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 in so*xr jq16 0wqxeries to an ideal battery of constant terminal voltage. At thq0q w1ox6r*jx e moment contact is made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series t hy:iy: 3u2ullo an ideal battery of constant terminal voltage. At the moment contact is made with the battery,:yyhi3:2uu ll 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 resfylj5 rk3oz98 istance 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 r1 tc18smb)(a3ed2tk ij p 9qdwith inductance 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 serien3 ub-8in*r vqs to a battery. The time constant for the circuit represents the time required for the current to reachiu8rq3n nv b*-

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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 i6cvi. r9x a.bmn series to a battery. The battery is suddenly removed frob9i..mc 6xvarm the 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 hav8e+pjgra/(ilfip fw wu,5ga 8wb3)9w e the same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circu9 ;bf;0/ xk7om hwkfnbit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, t pg8cyn2e/ .r .imhd1yhe current i.gcrpnmy8hd/e21.y

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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 factor whelm0sia1 ;i*q8 las3kk n the frequency is tri is08qi3; m lls1a*akkpled?

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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 v sh1np( wpa2p.oltage across an inductor is doubled, the inductive reactance of t2as h np(.1wpphat 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 voltaexugw+ 4*m5gj vec (853syug lge across an inductor approaches zero, the inductive reame g5jewlsgvyu u 5c+ 3*g84(xctance 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 connected2exjwn a(+t l6 to an AC power supply. In this circuit, the currejwla xn( 2t6+ent

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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 whata4 msqnq08 zg. factor when the frequenm04q gq.asn 8zcy 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 Apjzbe xn9 7q/ys)k:ph0/ t9jbC voltage across a capacitor approaches zero, the capacitive reactance of t:7kpxqyj/bp9 ej0 b zt)/s n9hhat 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 th piuz h19 kf*qq:m,4wux-1 rgqe voltages of the inductor and capacitor in a RLC series ciq 1qkiqzx h -4wrgu upm*:1,f9rcuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined asyrv dmb 7:vy// $\cos M = R/Z$, 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 inc)8ajyctb5 vbz.8acq dwok5 +14b2f njreases if R increases.av8jb1cdz tqkawc25+n f b ob.y)4j85 When 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 increas q5rn0dnxn3a 05hkyf7es 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 im()d77r/ lhn3mad4wlxmy63 . irlvbp a pedance 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, the / i* b0xzxf z)8aawwi wbmv*l9tks+:3resonant frequency of that circuit wi zi3bawfx9ivs8*bk: +/w mw*)x t0zlall

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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. At reson /btg)ds4qc8 zance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs whenx wk4zav.fa/+

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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 0a gsp:ja 4rm:-.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the mj -ra:4gspa :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 rgheo m v.d35ib/(7 svfadius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetichb. v/so35 ( mg7ivdef 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 pq:2ss9pk i7t8.2hgbph) rpw is rotating in a uniform magnetic field of 0.20 T. Find the m:pgs7ib2w.h tr ps qk928p)phagnetic 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 adjustable single loop is reduced from en3 2cx 2har 4 eycjscxd2o, zl*tb./;$1.0 \; m^{2}$ 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 changes 4w uti:b3)ba9 kl7o n kh-cm8e9 6gepsfrom $4.0 \times 10^{-5} \; Wb$ 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 wi9/xjk*oy 3iui ssb6 j0;qs m3yre on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0/0j o 9 xsyjkiy63ms*ib3su ;q.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 with47 us3y-ox kd*gh0cdi .q le9k/95ro7txak wg 15 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns os 3dezmd30,7wovj9n9t8 6jp ; bzapyand area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally at a locatioet 0aqp;qq 26o;kyf) gn where the q fyk;)q2a o;get6q p0downward 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 2.0 m long rotates at a constan:ji-jc zssq; (t angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in acs-i;qsz (: jj 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 haspo+pc,;7-c b 5fhr3c;badvw n 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of 3 rv 6ykcu9q1qarea $0.090 \; m^{2}$ 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 it6ag-- dot. 8sz0igz whs 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 m0g-wzat h.go8i6z-dsaximum 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 consistsmck fx;+6o j2 slujqg4f 0ai6n/dur-0 of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced 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 construck0eupyj 0dnmv461 psnu m27)qtf - 3qwt a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T e ky7mj2sfwum60-n)u1p 0np vd4q q3t 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 generator with a maximz4cgtjol l.z3uuas+:e 82p) ri2xlel3,z x4k um $emf$ 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 resistancewz l(s*lw 8o nkusr16v -) hol48the/v 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 y*igb58w qy/f 6x1soqW. The motor operates on 120 V AC, and when running at full speed it generasw6*bi1qyg ox/yf8 5qtes 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 conng3ms6 b-7srj2npnu )hected to a 24-V power supply. The operating current inng)psb s7u6jm2h 3 -rs 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 connecn- idrlml538pted to a 24-V power supply. The operating current is 1.0 A at full speed. Whapm rn 5dill83-t 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 resistaff x18fcx9nej) 7 u,xgnce 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What 7fgj,c ef9xxu f)8n1xis 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 primard* :t1r fi5k, 8; -lpnpyuplciy 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 ie r28l z2wkyq-e vz;w)n the secondary. How many turns are in the sele2z2y;-e8w w)z vrq kcondary?

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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 neces:/nd/tva1fd*iouq x:-s 5e w jsary in a 110-V primary if the 24-V secondas:: dfa5qnuwi xo/*j-1evd/try has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secondary cotnn+f)yh 9s gn.1y o.xil. If the current in the secondary is 3.0 A, what is the current in the primary?on x9)ng.+.nht yy1fs

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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 transformeq30 j8rt0 a wk;y*w;b9 mhqkdur. Assuming 100% efficiency, how many amps at 24 V can flow in the seco00qkmwbtrw;y;j 8 *dau9h3qkndary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. Themt85gox4 z w2x8(zr bg primary coil obzxwmo g885z4gtx2r(perates 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 ou en)q0h;b (tuy w1clcp.p03jn its secondary cl03.h(buuwpt) j0nqe ;p c1 cyoil. 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 primary2hjd x*u6k: rk coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present ruxj6d: hkk2*in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 d.-0 -trh adbyturns. If the i0by -ardh-td.nput current at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its seconb0xf w*y1 ror;dary has 200 turns. If the ;r*yf0w o xb1rinput 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 trann4zh9hb 6l0w:a 6f0 hb:q 4ubqxrg;kksformer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output ohh46:b w z:k6l h9f0x0uaq rn;kbbq4 gf 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 uu2qb5*ui0-0l ft wkqA of current at 120 V. The voltage is usually stepped up to 4500 V by a transforme2b q5u kutwq 0*-0iulfr 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 pm;6id 4nxn mh8ez+ 2 87cymxuis usually stepped up to 45i mh8ye;26p xmxdn8+ mcn4u7z00 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 x;*nin9jx0ta8pcletl p6 o ha/u4 gb1m2/ b3e stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percenta6t bhngex pb1*9pnae//;tcox38ui m20lj la4ge 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 km0t nv5ljow8m3 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 withlm3nv 0o5j8w t a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A g r )j5qnlc,l9yenerator produces 100 V at 70 A.y r)5l 9cn,jlq 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 line at 1000 75nlkcvzn .**la( qu xV. How much less power would be lost if the power were tqc(lka .l7 n*vxuz5*nransmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator isn8lv*(ya4pj)h7 wxrqd il+n 5 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in t(hllvr +w n)*4y a 8pq57jdnixransmission 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 y3qd 10kyq5p (u/nehxmn bw 6)ju8x.ocurrent of 5.0 A. How much energy is stored in the coil's magx0wyj(/1upxq)63 onn qybkuh 5.8d me netic 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 r-e3ow p4y3sop-(r::kzg mah 6.0-W resistor and an 18-H inductor. What is this circuit's (asz-rhoome4p:3: 3gwrpy k- 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 th7v3nl64u les;jgowv1 e rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet .av,ev5.dtxw,,yh zw. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the re sibg-k9cs/ny wtv0:f*pxxc2gjm2;) sistance of the la/*;i- v9yc:wsb) c20f p nk2mxjs gxtgmp?

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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 con/ -8gdq q : 7 :rpxvh*mov:euiqqyu)r;nected to a 120-V ac power supply. What is the peak current through thrvm:r 7;eu8g/ q:h:iqdpyqv)-u qxo*e resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What ix yph5jku(f 2pc.56 5xc(rlf afb17qn s the power dissipated inj (qp nf6b raf(uc15hf7plyx5.kcx25 the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through 95vgd7xyze 9 rs)kp7qqdw-v ;a 50-W resistor 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 resis8kj,lnk g2 o6zrqu0z2tor 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 50-0*kc vdhi (-qtW resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance om 5+jgp*qmp*a f a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50- gzh17wt9ntg4 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 1n h9b8s ;n9jf ( nyxe1p2d)xxx4.0 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 at 10k+2i/3w ) zwn jtx)c2sz;xx vw00 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 wh7 mid4vg0q paw5b:-ctx 4dp5hen 120 V AC at a frequency of 20 kHz is applied to i4px4whd gp :55-qia 0v dmb7ctt?

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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 throughl-fk)vb6wmos*7w 0 6mdnsyv , a 2.50-mH coil due to 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-mF capacitor at 1mv r+dp6gogz w( t6*1a:jqqj10 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 reactanctq0 )tag q9haqhyv48u(v):rm e 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 lmfcc/d5mp*4otb vz 6tba+ex ; 0h(f :10-mF capacitor 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 will the capacitive reactance of orvaux ,nm r.:ih8nbo c9d7w1*3kbm,a 0.010-mF capacitor be 100 W?kadro, m9n3ir mx., h:bc*w7uvn ob81

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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 o4)o cg;sojn1u:cp8;sr-bdm at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance c 5vif3.eev3 h u*lkqtz) )3ivof an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, )eh*vii.tv 3q lecku )z53v3 fand 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 1509eshybq og06r 0l8j-wqj(8ezy .3 ssz0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in seriesyqzzojhj89(.l 3eq ss- gs0r8we y0b6?

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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)pwjhj);k s l2-W resistor, 20-mH coil, and 1.0-mF capacitor are connected injk;)sl) 2pwh j 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 inductor, what 1z)il zr6(c xzf.(sm)jhdxg- is the impedance at j -x1zi)r sf(lcx.hm(gdz 6z) 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 sc;ib7qo .+u,t uw-i dueries with a 20-mH inductor, what is the phase angle at 10i7,oit.d qu-c wb+;uu00 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 ciridsea 3d 8k.a uqoc,8;cuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100skqoiuc e3 ,8a d8a;d. 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 capacita+lu8+ xx jw*ixc-9cittk53 tznces is needed in series with a 100-W resistor and 15-mH co*xwxz t-5+ t+ x9k8c3ujci iltil 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 be put in series with a 450* nb n2icm9 mnnn:i32d-mH inductor at 5000 Hz for a total impedance o3i 2 mnmnb9n*cd:ni n2f 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 atabjct ppxy0 pq,:2/5f 1.0-MHz for a tota0c 2:5,j a byxpqfppt/l impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. Whl sqqx/mb *n+sn .8m0xf.my ggp,r .q1at is the impedance at 100*mpql sb+ ns1mf r0xq/g y,.mng.x8 .q0 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-mF c7v*w s 7klxp.5; akyr)xb mkq/apacitor at 1.0 kHz for a total impedance of x.ma kyqkb;r /7) w5v7lpk*xs45 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 tb7j 4lxh; 9eh1.0 kHz for a phase ang 9h;ebht7l4 jxle 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 ; do,n.y7z zrua28fsl resistor at 1.0 kHz for a total ;2f8zys,udnol. z r 7aimpedance 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 120i md zal:4afa3:8i1q/f gd1 wr Hz. What is the phase ang m d 3w81r fq1f/agaa:4dlzii:le?

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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,h 54owwmbz*;ia gp,5k 20-mH coil, and 1.0-mF capacitor are connected in sizwpmwo5h ,ab*;5g4 keries?

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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-m .pst a3),yutvm8a8a nF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. ,n vts838t ua .ym)paaWhat 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 capacizi3u.o; 0fa h5b,j fwl+n;xkm+ ;lz1uv 6essltor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this +ib ,j fu+;lu0;h l6vw1szmfakxs nl5.e o;3zcircuit?

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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 contpp4 5dlc 2otd.) *hswjaining a 50-W resistor, a 10-4ot2ph) d5.wjcds l* pmF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase *ygfcx9dwta3. x9; rqangle of;9t3*wxf.9grd cyxa q $40^{\circ}$ 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 6 v(h* qcnqnx,m,f2 ygu3jp /zfrequency should the circuit be driven in order to have maximum power transferred from the driving sourcfc2,nhqp6g/vu*x ( jm ,ny3qze?

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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 z; 46llaw5l; oth2z rr12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive tzr;;a4zwl5 lo2h rl 6reactance, 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 nn3(61leu2ej 8to cqqnq69 ea is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. W,1ue scmz o6gm,vl-.)c md,ga hat is ts-,egm ag,omcz 1ul.v mc,6d) he 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 fac*t lbfq )ldi5t;so 2)jtor for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a)s2tod*5 flqt; i)jl b 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frejd86 kl tp/7qbb am(2ovhp6j.quency of a 1.0-mF capacitor and a 15-mH coil in series?. bvqbjh8 p2kj6a6lo/tdm(7 p

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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 resosu84k.,7ve)cs : cq kyuh8s jonant frequency of 10 kHu,4y8euosvsjshq:.k7)kc 8 c 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 wi:2hj ut7mulf4 z3w4vuth a 3.7-mH inductor for a resonant frequency oufl w2437jmht : u4uvzf 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 ply7to yiw-ewu6 :l ,u l5*o 1hwoi( ko(-uwllo)aced in series with a 30-W resistor and a 40-mH coil owihy(t6u lkly -o- luw: lw(u*,)o517ewooiif the resonant frequency of the circuit is to be 1000 Hz?

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