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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 magnetic flux exceptt2dt4fkzg(zf3qj f8x3 r:uqy(, s vn4

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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.ibfn )or8 xx: 70m6 ll19cj dzrce,ca 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 producyq2d 8lqh /0vues what kind of change on thelq0 qh u8yv2/d 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 q 0n4;mhquqa56 ge9pmwire produces what kind of change on ug q 5qm0649ha e;mpnqthe 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 wi(;o(;qeandih 6 yj6eene+6 r bxo1t x1re produces what kind of change on the induce; jin66eey16odxt1nqa ;(o bh+er (xed $emf$, 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 fro+;wdp*e(ay tt ,u4u9;.knom fqpte 5qm a magnetic 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 a cosbj r 24dx7d:enductor will be that which tends to produce which of the following effed4:2r7d jsxeb cts?

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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 aboxzoe+d7*jmo ma78+ zove its center with its north pole pointing down. The statme+zj*+ d8xz 7m7ooaoionary 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 fl-qo,.hhi6d:a8 vdv*hat6d o 2fjo-do at on a horizontal table. A bar magnet is held above its center with its north pole pointing d6 otvdi2,6aodoo 8h -fvjqh.:-ad d*hown, 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 table top in a region where the magnetic field vector poin3b ,dhj0i9locizndnc7w7,z 4ts straight up. The mhwdz79nl0 c7, j n34i dcoib,zagnetic field 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 levelrd6 5v ubu7 y3-lo(hkz table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what iulz3hu-vd( 7k o65byr s 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 to9ubpu9cl498nb x ;cnyp in a region where the magnetic field points straight down. Thenxc9 ;99 4ylun8b bcpu 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 3, ;c3 dn2nwrllk0 g+sbz*xvxlies on a horizontal table and carries an ever-increasing current northwawd xv sc32r* l+0n;xbgl,3znkrd. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north poslyzu 2): z2k*jf) ypzle entering first. As the north pole enters the wire, the indu2)zyj zfzl*2uy : p)skced 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 a dztiylr /)xv1s dz:2nqup 5g5.2l: omngular 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 ryxm lo1d2dq ) ztnil/:s.5: g2u5zvprotation 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 ise6x)be + n*m:fx8dnu ah6x ng+ rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, w8dgbf:xxa+*mhunxnn 6ee6 + )hat 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.b nw:1-cx 6qlz
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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 tha2bzo) dnt vu3w,dd 31et 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 a8h(6tnmgz .uh magnetic field. 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 movedu7w6* ab;eynlb( u tq+ northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potentia;e(+ wbatl ub u*n6yq7l 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 constanr3jf yl* b(7 uie;yg5v0i iv8ht angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator 672-hrqxzcz(sor8hp or 9y*w transforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The eaw *fgz(3pbr 3l8 0lb6qo:d5g5jdu d frequency of th3wj lozrd 8p3e g05adlbq 65bd*u (:gfe $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device used t)q(7;4vyyaa gjud ex)8hl 9c bo

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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 di+upj d,w+.:ksk p 0g q0pzz,kevice 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 containsac73 hum.i9- u,unlas).zmdy more loops than the primary coil s m3zyuaid-)nhuuc,al9m. .7then 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*ic ra(sbg ov(-s)2epw6,wuk primary coil contains more loops than the secondary coil (6,asi c uogbk2w(vr*spw-e) then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inpusb6/clg(d: h d0jn:f bt

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circuit 0gulwuvhn8/4gb 3 fo2, +zlgr,

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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 qxko+mv+js5l:f+-smy m x y6*connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acrm6kx5*: s+lq+syo vm+mjyf -xoss 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 induqd(a:ovksxs i;y2 h ()w6*tuw ctor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is)( wxqyduokwa th6iv(:s* ; 2s made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is connecte-w+,t u r4dsykd 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 inductance L and resist xnem,(. bmwur7.fh,x ance 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. 4 mp*kk*47ob.p fhx soThe time constant for the circuit represents the time required for the c7ohx4 pk**pb.o4fkms urrent 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 i l avevpv 6 (tdth+7pb8.q8(skn series to a battery. The battery is suddenly remo8.7qasbt 6hpdv+vpe 8k ((tvl ved from 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 have the same unnz;p8yce2cmq;5 a be0 jl4g:xits 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, mbj9a8- 9rh 5e2 jb1osigh1ftthe 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 cog w,9t9wbcq usm ms4w(hm;z/2nnected to an AC power supply. In this circuit, the curren 9,2; b (wsm/tum4gmhwz9c sqwt

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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 when the f(r) q u7rh6bst;6hzcnrequency is tr6hc ( q h;)un7r6tbzsripled?

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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 t wuxz4egk6ip3w ro7q+;q9d6 h he AC voltage across an inductor is doubled, the inductive reactance of tha xzg46 ed6;+iupr3w9owhkq q7 t 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, t0v n vpnk(0vht/k1j)ijss+1,c3d a lohe inductive reactance of thakvik3od/ jlhssvj (p0an)n tv+10 1c ,t coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, the curri ajf h*m):mr 5 sbzciktby1jv3))3s,e*mh m3)s)t fria ksi) j1: bzb3,5cyjvnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance i9zz2rs h 5lwc0n an ac circuit changes by what factor when the frequency i5l9zw hr2s0c zs tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero,onat.knrd 1mdb,49b .h-n l chuw90+f the capacitive re0dbr-nk4hnbt .1 aum+ o,.cnd 9lf9whactance 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 volta-os-2vp/r r ;m jt:ejwges of the inductor and capacitor in a RLC series ci--semrwj r2po /;tv:j rcuit?

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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 asfa(e6 2uedls,801 mpl2sn0jusxvz*w xc3c l ( $\cos M = R/Z$, 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 imp jhabs466ha 7qi/fo-nedance of the circuit increases if R increases. When is t6ahf7bns4ja- q / ih6ohis 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 impedanc f;l1dnn6 +hvp:)*9 wdbe 4*fuclec xte of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increaslblkr4 9ip;j5 es 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 capacitlrmj5co i5 ,u*ance both double in an LRC series circuit, the resonant ri55mu l*c, jofrequency 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 circuitsv dl111y616 svey+zk-rp ydk that is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs bpk0)eh7 gi5xwhen

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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 x q-*vj2-v.1m +gzjcjapx26vog qvv) uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop )vgm -2x vv6zcq +jgj2v1a.x *j-vqopand 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.p k.z: j,pb6tsn)qdj a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fieldp6s k jbtd:.z pqn),j. 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 i2asoo6irt, ciete+f g;0dj)*n a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop e; fo )t2dira+ei j,o s6*t0gcand 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 singl6;sn5p-j ax ii edp70qe 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 changes from ,+xez,pez yi9- iwd8 w$4.0 \times 10^{-5} \; Wb$ 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 yc7d n- -q a+d,nl1b7 rbrw,snframe with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coild,nb,r dc7 bs7y q1 +al--rnnw. 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 of3ibdh1l b y 2wacs05l) $0.40 \; m^{2}$ 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 arb) g t.l8/qhhtea $0.20 \; m^{2}$ 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 horizontall/,j5jml 50w cbuws,w ay at a location where the downward component ,sl5b/wcwj m , 0j5wuaof 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 qos0t jm): yn;constant angular velocity of 2.qtoy);j :nsm 00 rad/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator htcki2r *3er*v as 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 w;4nzf5mgnx a. ioz(,erq f58 cire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its arma;53ob jbk/gndj -be( ,v j4yuvture. 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 o43ov;njgy d/j bk( 5,ejbv-buutput voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists, txbndo.ujf3y m;s;z( g0 dh3 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 w ,kxpf*v72av construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If2avf p *xv7,wk 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 genea;; fpk/(*noxts4 ah gppl5 a9rator 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 7mo22 q i)ruvrm5v4i5j fdey: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 motori6bk,ts)o ;dm813v,hce2o* bti izm c have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at fullo8 vi 3cm2z sc;kmb,hd t ,6eioib*1)t 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 internalb r )gka.ygf;,vj3g w( resistance 6.0 W is connected to a 24-V power supply. The operating ,k.(r 3;yfgav gjgbw)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 gx*mq)iksem n.so6mg-; x ;0eto a 24-V power supply. The operating current is 1.0 A at full speed. What isxxeek.;sgmmq)6* sm -;og0 in 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; umzf4trv d5 pqz5m++. The operating current is 1.0 A at full speedpd 5rtzmmv+ u45q; zf+. 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 g+1op a3kf5ctl vlx*9 is needed 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 2,vzgf4 3fk-srt: vxx5dye(lpf6zz4ql t*0n the secondary. How many turns are in, 5fges zlxvpdyl0k2:vt q4(- x4 rnf *t3fz6z 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 the 2z ig.)2jv 7w-cu5ggts*axbc .p z-7jei3l 5vo4-V seconda 3cw7vjg--v57jp a5xo sgiel.)z . gbz*uci2try 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 xjb8b aton;mjw v*2/ 1lf- nl92000-turn secondary coi8bma*jn1b t;/lx 9 n f-j2lvowl. If the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the prima 2iv sjufc; hn.f+g82qry of a transformer. Assuming 100% efficiency, how many amps at 24 V +jfhvq22 f sc.i8gun;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 transf39-6fk1dg z fzzhf, byormer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What doeszhf1-zz63bgy fdk ,9f 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 cldyyjm r8s14 7jh 7h*aoil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secom1yjhhd4j y 8lr7* sa7ndary?

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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 and 300 turns on its s35+y-ybh.omv q(dbg 6m i3 gzkecondary coil. If 120 V at 2.0 A is applied to the -m. mi3zg( y g+53yhdk 6bqbvoprimary, 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 transfp -hqt6 1wqh.wt7rs *normer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output cw. 7sp r1thq*ntqwh-6urrent 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 trans.l- pibkhc 6q5former has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondabkiphl6c - 5q.ry 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 gney/ vdf82u*0u4sx yhas 200 turns. If the power input us2yefd* yxg8u0 vn4/ to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 mab0+o; *: eea4gaduc A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find t*ab:u4em;eg0aao dc+ he 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 volt +g,s1y rkk.nsn 2ry6yage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in rysn6+ g,yyk12r .ks nthe 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 vol55o i bu9ie5y g,cd7tmtage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmissioit 5,mygdb u e5c957oin 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 of 0.60 W. Asc-et/w 0 ds:v 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 v0dt-c /:ewss 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. 1* hxrmdh+5gswo ;rk560 W. A generator producsw1kxmhr 5 +d*5gr;oh es 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 line at 1000 Vap+ n2ilq1l;* crhb,6 5 kb(3dr)uqx/xl snw n. How much less power would be lost if the power were transmitted at 3000 /pxxq ulc5q) 3r+bndl n1s;l* n6 wi2hkb ,r(aV 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 is to be transmitted,t f7p o3b9bxme0/8b 1 mzz9mxpsqx9 m on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the powe/b x m 9t3qpbme,p0m mszozb9xf71x89 r 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.aa4m4. 9rjj zke1pn 4wd 7k*mt0 A. How much energy is stored in the coil's magnetic fiel9.awj d km17te z 44njm4kapr*d?

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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- :bcld(mdpz/llmx8:5 W resistor and an 18-H inductor. What is thilmc l:5/dx8dlp(bzm: s circuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltag jqsd9 37auz,urdco-2e 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-)( bon-w)n.skiyw+g rV AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is ts 0vs:insjh63he resistance of the lajs3:6iv n0hssmp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the peak cur p3zh1y z,mm)trent through the m t,zyh1zm )p3resistor?

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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 connuyb8mn (s:;k nected to a 120-V ac power supply. What is the power dissipated in ks8:u; mnnyb(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 jkf +t *o 9h29+dl5h/fmsrewr*yyc0 ka 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 resistor is h1wiom509 av:2 )6 jja qfasdj$I = 0.80 \sin (240 t)$. 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 y4b*fi5h :; kpdt8asnresistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductorl 3nf)gj3prw:7 h;;mwd rqxin2t80 m d 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-m w-d8+stkg-bl 3kwlwi:- 5i mlx,yp/wH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive ri0vqgcbt0 3 9veactance?

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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 u(9khplu,- m5bb7f ev inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 42hch+ efs qenmuf,+mj a:1-p kHz is ap:+ f uf4nq2jsc+e1he,mm-ap hplied 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 110-3ts dp go/+md3vsu-w 5mim47 fV, 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. k:ar5kece0p,v ,dqs;y3 /vdh3m6utj / rees)7-mF 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*boau6qt lfp+va4;6rahs: rl t /v( 5c W of 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 do)lli*req y :4x*d p0 i)pave)g/nt -sves a 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 a 0.0 ve3o k.+hq6+rxgnf s)3an3zy-2 kuol 10-mF capacitor be 100 W?uk6xk3. 3)rev nfo3n+ o gs+2hq-a lyz

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5.0 V?g7)bjs9, h0cej*r w9v iiuye1

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistanceh08in3gkho t, , 15.0 W inductive rean80 3hh,iktgo ctance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil-bk; zwaq9h4o s;(iij , and 1.0-mF capacitor are connected in bhii ;(k; 9oj4qs-awz 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 1.0 ,;u8 )m ;pvd)uyt nm:qxar *cdjvn71fo8rs:i-mF capacitor are conn:d;dvf*j:7),ix8m ;pms 1cutqa rnnr vo y8u) ected 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 series with a 20-mH inductor,1/yylbu;lt,o(a7r cfshy*) o;ak3pj( a yz, q what is the impedance at 1000)1a(yh/,lt jkaozs*ryq3(lfy7 cao;y,b up ; Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, wwfh.v,chok* -w. a4umq 2mbn-hat is the ph, *h.m2fbw 4vw n-o uq.hackm-ase 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 serie;r n:-iep qo;es circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of -q:er ip;oe;n 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 rdlcl3gya/ sg:g 0x d+;esistor and 15-mH coi gdylg 3xl0c/+d;g: sal 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-mH inductor at 5000 Hz for a tolk39pa5jk u8oj54/ ,n nwolq ntal impedance ow5ok3j5nqa ,ll4 9n8uk/opnj f 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-Mcmqu8 e5b)(k n (bt- qgs)v1jxh ,,epgpmbx, 7Hz for a total impedance of 150 kWb 7 jqb )m),e,-g cpph,81 x nsgut(ke5qm(vbx?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What l:f( (duuf )oxi(t r1pis the impedance at 1000 otdrlfu: p(ixu(( 1f) 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 capacitor at 1.0 kHz for a t*jyg.m;c9z zqx1-bl yotal impedance of 45 Wbzx9gyy*mq.z1; c- jl ?

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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 l z3;cuv4 vy6i10-mF capacitor at 1.0 kHz for a phase angle of y;lc6vuz i43v $40^{\circ}$?

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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 f *4 nc*ip /t8fen3e0s ucjxq.1.0 kHz for a total inpj/ x fqf4un3sic.c*0 8et e*mpedance 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 120b++ +msdrf(ir Hz. What is the pha+r( mbs +f+ridse angle?

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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 agyz-zq 89mzc5r.q bj; 100-W resistor, 20-mH coil, and 1.0-mF capacit9jz- 5bzq .8rq yc;mzgor 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 consists of a 100-W resistor, a -jv+up l92q a;ze7tu lpamm))10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supp2e +pvjl )a;ul amqt-mz 9)7puly. 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 reay m ck:3if7 01xj5ojuectance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz pow i m7jejf5xko u1y3c:0er 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 resiw;+oxj f-* a owy9z4hlstor, a 10-mF caxwwh-4oyjz 9fo;* +alpacitor, 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 r,i .w-qao)zui esistor for a phase angle of iwqo)u.,z -i a$40^{\circ}$ 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 fkd vn6mbgsp a72.4blr0rq36 8j ;ym -g3besel requency should the circr.2n 8gg6rqlys0 be 6b bvjpmesakld43;3 m-7uit be 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 uxa*:8(u 0gz rq(gcz iac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power suppu( cgq8*r xg z(au0iz:ly?

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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 circui bb9l4)wyc h05sbe 9nyt 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 resi vmbuh+caj;q 4s;h9rfc( 9p .gstance of 30 W. What is the powerm4frgv psqbj ;9c;+ch h(9.u a 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 conta9gve/ -007f s1 ;)wfbdqxvxkjij rs/dining a 50-W resistor, a 10-mF capacitor, and a 0.45-H indu vd1j s7s9ffg/bw/0 ; )vrijx-0kdeqx ctor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capaidc/3s76fs4 cy lr -yzcitor and a 15-mH coil in series?l3f c6c4-zi sd/s7ryy

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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-k28kl kkkq gjre,,h 7ries with a 4.7-mF capacitor for a resonant frequency of 18k2 j-klkk heg7 ,,krq0 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 3.7-mH ink zv9, (i;0y9yjdi nngductor for a resonant frequency k vnn jg9yz ;iy9di,(0of 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 placed in series with a 30-W resisto5l43vsj dfcse x02miqe :-kh0 r and a 40-mH coil if the resonanqc kelhsijd v2-0exsm: 35f04t frequency of the circuit is to be 1000 Hz?

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