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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 zsurq 9zn 1gc1m.w* s1magnetic 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 stateshhu* pb1i)nws8 3f 6tb 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 produc 46s *osed4nipeu3:nf es what kind of change on the inducue of: *6nnd ie4s34sped $emf$, 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 mag+/fzv6 69 as,hfpdve kg,;caqvf-9pknetic field through a loop of wire produces what kind ofq6pv6+9, evpza/9g;s cfkkaf- hd ,vf 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 c vg+p( us-tazfy:z2-what kind of change on the induced sv:z 2a(+uz-g cpf-yt$emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field ch( fyu5gj9-ban $emf$ 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 dire:v p3rc2hj,ahction of an induced current in a conductor will be that which tends to produce which,ja 2cv3hrh:p of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is8 i5r;z5ss; 7mggye6uu;dzga held above its center with its nmu e5;r;6szdsgi gzu58gy 7;aorth pole pointing 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 on a horizontal table. A bar mmm,9 * rdx/bvqagnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from ,9vr dqmx/* bmabove)

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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 magn kf)wm:f siz/mb63 -voh, xfn9etic field vector points z :-xm h)o6 nim wf3sfv9fkb,/straight up. The magnetic 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 level table top in a re)-zj 9k :dash,0rj:nh vndg5 lgion where the magnetic field vector points sth0g9k sj:,:ajzv -dldn nh)5r raight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field 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 when; 9 :zwvxaiy 7p+nxn5re the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the directio7aw:nx xpi+ y5zv 9;nnn 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 7l; -vfnna(tp i1q 8fm,oxm8fa horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on t;lmn-7nft(x p qf8 iaf o1v,m8he 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 kmqe9pvuh+ :c1uj/8h;zad/d wire with the north pole entering first. As the north pole enters the wi zm c quhk+vj/:h1de 8/;da9pure, 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 axis whoswqnc4l r,m)vba,p 8c -e direction can be varied. In a region where a uniform magnetic field points straightc8 wpq,-)4vbl mca n,r down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis wh4c4nlfb o 85 1ux hp+riulj56gose 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 rotation if tf4x4p58ioljg+ 1 bnhc 6lr5u uhe 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.xenfpmj (;yy q),9 f:y
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that 8ywf264dc .ha etvhk4an $emf$ 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.v zy1yfxso( jgl t*1)2 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 itad14sz;0hf t n the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the poh1f4za0 d ts;ttential 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 . ao1u+6jl9be n 9dttukoin0.at a constant 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 generatorin u ii b1ou5nid7lab)d b4/3- 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 revolut;*lhc7f-vxxu4 f;v e bions each second. The frequency of thec x -evh;4l*x7ff b;uv $emf$ 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 devicev88bmeg c6k7 y.y8idbm,lnfok gd 3, ; 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 devicunzxl5 n9wxf;;4lbx/ 7z z,xde 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 contains more loops than thi5kyh1vzjyaw 89xa *3e primary coil then it is ah3i5y8* 19zajxaw y vk

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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 contoi8:0)p .azjgtr9t -fd: mngwains more loops than the secondary coil then it is agtog:-:9 mdrp. jz) n08wfiat

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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 ixg 6 d:agw0k+3 fej;zknput

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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 v c7+ gbqv /,jy q)dv;bx0f/fecircuit,

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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 series to an ideal battery of con14*ry4 vva -uj(/v na kl8uazfstant terminal voltage. At the moment contact is made with tjyav1 4*-v( luaan4vurkf z8/he 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 ser6;qsljgnjk -,e 8tg9iies to an ideal battery of constant terminal voltage. At the moment contact is made with theei jn-l9k,g sjq 6tg8; 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 resistb3 6c ql9oeala(en)n 8ance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L am1 37(wxn/gp9 y eduxpnd 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 ikyiyy+fx ( 1req:( ,wwn series to a battery. The time constant for the circuit repyie(wyf(y+:kqx r w1,resents 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+ws pb d8g:;uz are connected in series to a battery. The battery is suddenly removed from the circuit. The time constant f;guszw+ 8p :bdor 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 sammb,;r cz 15jgqcmm)m, e 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 circuit, the t-y*x 00)/ dgpthda8k wa2ljncurrent

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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. Ikdj 0/wnm6yg/w d6+ pqn this circuit, the currenw6dqp gky/jd +mw 60/nt

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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 freque3zguos v.7n +ency is tripl+nes. gvz37oued?

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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 acrosulyj4+ 85dgpjs an inductor is doubled, the inductive reactancej5gdl48 j+u yp 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 7hz: *gkbgom nr /aed1dz n4.,tpemn)w:b2x8 AC voltage across an inductor approaches zero, the inductive reactance of t1zn2 d)g p:whxm:/b,me o8 k .a7ztder4 gn*nbhat 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 circuito)g6.l ol uw btkph*g/jw:(z 1, the current)pw og w (z1/.:*lhugtkoj6lb

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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 txf:yp 0u)mz z4he frequency is trip4)xuy: f z0zpmled?

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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 capacitoopez6-gg a2za7jq o-u1q i.:v r approaches zero, the capacitive reactance of that capaciz-e uqz7:q6ja2 p g-a.iovg1otor

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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 tuvd(qr4ruzowc3b7,cr66ol0 5 ip s k a(z o.u:he inductor and capacitor in a p(57qwrbu uor c s( o:oicrz4.za v,ldu k0663RLC 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 7v v1z6v)+p i(ao)fct+dj9qdkh o8 mhcircuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit incr joy4,) 6bx;33u ypklfx zkt4geases if R increases.ouxbzglk4y4)k, jfp3y63 x; t 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 th2ky,g)synw,+jodznl: a7z 05 x: d mgye 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 circuipj)d4wfs r o0;t 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 thmdw,0c7ae/ .1l 6;1snr y bmzavmdcm1e capacitance both double in an LRC series circuit, the resonant frequency ofw r,1mdbsm yl1d;z 6mc1vc/aea70m .n that circuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At resol/u+m,n x+ffxw k5m u3 7cxg xyg).z)tnance,

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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 occurvy,2bdo 1u0bv s 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 magnetic fi60kb2j9 s xjr7hbgkd8eld of 0.20 T. Find the magn2xkkb08g 7r bdjshj6 9etic 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 rotatx1fbb)p ;8g2bcf l qu t7xp:(oing in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are bpltfxbq2u7; 1(p) fo :cg8bxperpendicular.

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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 radiu4ez91 4 4fgtt:fmoapos 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 magnetic field vemofotzgf 4 e41:9pat4ctor 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 area8,8owiz.z h(nhrjetz*b.+ mw of an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coiwjou c6,1j-b0 e x5py*v+d zyjwx9-gkl changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped wit e9- lg,zqju-eh 200 turns of wire 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 0.50 T to 0 in 8.0 s, find the average value of theu9 -gqelz-,ej 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 tuqaza8,fnd)hm8 k .(fmrns 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 andib d1yw5+nmyo 6m+p:s 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 loy fecj/2 m9z; e7.bjlccation where the downw.cl2;j yz/me 97 jefbcard 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 l xwufpg/l;/; m long rotates at a constant angular velocity of 2.0 rad/su; /g lwflp;/x 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 ha*a0jpep l d*gjy5 xf:a7,zc+h *b pes8s 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 10dhfb i714vf(hn6 /x yl0 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 $emf$.

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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 80f1.b 3,jlnjbeil 6 fw4 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 tf.i14j w6 lnbjl,be 3fhe long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of area dj6)bc -:h2*cpyr(gk j(p jfm$0.090 \; m^{2}$ 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 sil5s *aznl 05t htusmj.ujzk 9y(.nb86mple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of th0tu ja(nu9.j6s5z 8 l*zs lkn5 hmbty.e 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 gh f/4,hrqh5 ksenerator with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor lyds6zpl0p+i ij e, )2x*s)qk 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 5a5f(-ck/ipkxn s qg0 W. The motor operates on 120 V AC, and when running at fxip5ck5k(/fs- gn aq 0ull speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power su,8 4im8fg*leo /kbpj8o zmag 86twez,pply. The operating current is 1.0 e8,gkzzb 8wfitaoj*8 l/ epmm4o 8g,6 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 6.0ll5yfs2 i2dc i 4dbu:ek j,-lu8b3mi5 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Whic3 u8-su5l ii kdlbdf5bej y: l242m,at 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 af(*hrxn4 gk:e(qpncpv 55, ay 24-V power supply. The open:ep5cghanp(5*r fy(,kv4xqrating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primf+1k qisp* 4i,j:l nawary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the se5, yz u2lap8.l oxb-qrcondar pau8 lbr2.o5l-z xqy,y. How many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the.ts g)ys- wk1d 24-V secondary has 100 t tw ydssg)-1k.urns?

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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 co 01 yr(ysxo4d tlj4f8myrr++q il and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, whatd44r 8t+ys jq1+omx(y0f r yrl 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 inxadu 127dposvahn 9sk92l 9s*he9me , the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can fku2*9ss 9de7se h2pa9mod 1a,vlx9 nh low 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 trans30ia0 z:ygsr g e r:pzl+att2-hzzw7, (v*r ubformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary dr2yvwr t0t, (le3is:*zggrapzzh:0 7az +r- u baw?

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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 3d*- e+f/b *gluz 8kmmc00 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, wha b+d *um8fm*c-/ ezglkt voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 tud84+ p vl.9cy d(xssafrns on its secondary coil. If 1sp fad 4(dcy xlv8s+9.20 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns an/mrpngb6gl fk6v9lr js2opm -f/br19o15 l+bd its secondary has 200 turns. If the input current at tb+r6bnf r 65b9pgm/1l9sp/r -okl v o21mjlgfhe 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 secondary has 200 turns. b a0.y, x ( hwu*ozb0zgzfm:x)t+cwa;If the input voltage to the primary is u , zzha g)bf0wx*ct0:; +wxbay.m (zo100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondas+7fo nm6aa1q-5pkc + g;aydwry has 200 turns. If the power input to the primary is 100 W, ockm;-7y aa6 +gwap5ns +f1dqwe can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steppe ysc 49:qnal5b hy;9n6 i;j.ujdthd v;4wz vt5d up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. lbt6a;c9:5t hdjh;9v.vq zdjs in54y4nwy;u 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 is usually stepp n7z4pgal/ 6xged up to 4500 V by a transformer and transmitted through a power line of total reaz/x7 nggl 64psistance 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 curt -0ldhb f)aj3rent 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 the percentage power lost in the transmission lineta d-3lb) f0hj 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 tol ddvqn.;w *v*tal resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. vl*dwvqd*. ;n 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 o u0s+ju:/brvcp8fc5nll1 t sn 0d,qw.f 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transfbw,v pl srn0cl08q u:uc/n jt 51sd+f.ormer 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 nzykw,nh+ln-3v 3 : xe6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 1000 Vv,k+ wz33nxy h:n-l ne?

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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 w pj8/nh xq- b1pzcoyze( j+,u.hd5e.at 20 A. It is to be transmitted on a line with resistae-d 1hp/wzq5xnpj.ouj.c e ( +8y bh,znce of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is storkb uvr a;k aqb*f48u 6x0l5is5ed in the coil's magnetic fiexuvkkuq lfs6 a0irb 4b855a *;ld?

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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 8mvy vc30vw c2xgnx -j5mgk5 9an 18-H inductor. What is this circuit's time co9g58 w 5kmnjm -v0ycvgcxv2 3xnstant?

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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 voltag ku (kg0d+oo5tw n+; r n5sokakyz17s*e in an AC 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 120-V AC outlet. What is thtt8 g i7; uo4gtcc dy8cu*b:7xe 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 resistance of the ,fw c0vu6r; n trp,ju,lamp06, uwtr, fc ,jprn;vu?

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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 a+hxmr hbyy/ l.qn ;quqj 7p6dgr+m/.9c power supply. What is the peak current through tr/6qyq7 .jhup /9b+n;ld qyxh+m .g rmhe 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. kkk.-8 k;b9 wp3+tt ay8wkrqu What is the power dissipated in89kk; -qk r.k tb8y ka+wwpt3u 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 a 50-W resistdwz(un )/va l9or 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 g/(azq z+c 2dxgn v9g5er:gc4 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resisu rio9*n z;kx)3w9uebtor 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 ;x,n7a 9ca 7gvs od4;h5udxvt1.0-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, yo lt4li* vk:db,bs:ds2jq7.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive reactance?vz9qk.zme - ,iair 9n1

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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 1000 H .oywwbe-; s(myh2tq2z?

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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 icx kd3 8c;kp6j .dd-d+ueg3 fmnductor when 120 V AC at a frequency of 20 kHz is appli86pd-m;+duc .kdjck3 g 3fe dxed 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 duegy,7dfl bh .3o 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 r:ethc b 5am.i7eactance of a 4.7-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 W of ca25am)huht5fb (f j / qjz n5+/7qlzymapacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a i 1 u;dx,4ug+vf uc4qlrl*rf+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 0.010-. r8zao pc4+djmF capacitor be 100 W?84+joz.cdra p

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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 t4ozoam kpso n*kxw3(hs:* /o-hrough a 0.0010-mF capacitor 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 of an ac series circuit with 12.0 W resistance, 15.0 W i6yp;/iff0ppa5onro j:k am6 /f+l 4t znductive reactan04+ifo/ffa;p tp 6a:pzlm6j/r k y5once, 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 wko8w9njy7 sne 48nu5Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor ar one7n8 snyj85ukww 49e connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle atn/.aj0xyep 8g 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF cj /y.ape0xng8apacitor are connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is conne jl42u u v9w*b8zklty+cted in series with a 20-mH inductor, what is the impedance at 100u*+4yjbkuv2w l z8t l90 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 connez523z (mdfux3s 7fxb8rbm x+kcted in series with a 20-mH inductor, what is the phase angle as3f2xrx (m3mb5 kz+ zbuxfd78t 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 1.06 ch*sgt+ z8 gcwyy)s+-mF capacitor for a total impedance of 100 W at6 w8)z+y+gs yh*tcsgc 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 resistor 18 lk qvmhop/w57)uuband 15-mH coil to get a total impedance of 110 W at 20v51 u8lb )uowkh7mq/p00 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 -yi 9-czn5cu rx 08jobput in series with a 450-mH inductor at 5000 Hz for a total impedance of9yi0jbzn 8xr-uo c-5 c 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-kW9c izko6elq ay 1d ,:ue)b*pw2 resistor at 1.0-MHz for a total impa1pild 69y *z )qbecwe k:2uo,edance 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 caprnij0d(ry:ahd y:( :dacitor. What is the impedance at 1000 a iyrnd:jr0hydd:(( :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 seriirihb - 16id7tt;:r l;ka dr4pes with a 10-mF capacitor at 1.0 kHz for a totarbti4-it irh d:6k1; da7pl;r l impedance 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 for a phaskmmo9mh b(. 7he ab(7hho mm9. mkngle 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 seriec b md a61y.3rjrbxwnm(g0/r6s with a 30-W resistor at 1.0 kHz for a total impedanyn6mbwarm3bcgr 1 jd6r(/.0x ce 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 Hz. What av qf-(/xuew( vvo+w7 is the phasvq- w/7ex(wf+aou v( ve 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 5fn63h q)dbm: a0z8zysa0l c9jpjqi6 6.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are conne0lp jcdy :iaf390mj) s qnzzb6aq 686hcted in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacid02d( eebeg4 htor, and a 0.350-H inductor. The circuit is connected to a 120-V, 6bd he(g4e0de2 0-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,vwbr (5ht2;e oz9c bm3 and an inductor of inductive reactance 30 W b e cm2trw5h 93ov(bz;are connected in series 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 .d8xcw gwrp:7 series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected tcdx7gw8 w p.r:o 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 wiwp ceo4 yx 2h-rkbaqgn .)3,+i )kdwe.th a 500-W resistor for a phase angle of y-e4 nk.cg wr)xp+h 3q.),d2eikba ow$40^{\circ}$ 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 = )g3n3c ux yp5vp*ovf,20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuy5*p)x3vcg unvpfo 3,it 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 ac series circuit with 12.0 W resistance, 15.0 se* c-8h)lc)iajau+ o m3hr;g W inductive reactance, and 10.0 W capacitive reactance, whenh;r+) a8iou cmgljce3 *ha s)- 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 anw(xem1w +gurt;m v9 4oh60 kfh AC circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W andecawmz++xvd gg4pu:qmsg19 (2f + lz 2 a resistance of 30 W. What is the power:+1 sgefd+ mlua(cgxgz qm294+vzw2 p 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 ;rc*6dddr6q ucontaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connecdr6 qcu*6; drdted 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 capacitor and a 15-mH coil in series? ,i /pksl0b1ozp,sz/0i bol1k

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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 capa0uc pqzr/k:z( citor for a resonant frequency of 10 k rzp0q (cuzk:/Hz?

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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 inductor for ;ezdoh5 .jufge.f5z-a resonant frequency of 100ghze.-jo.5 ;d 5ueffz 0 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 wit)k -apwlbg/5zw 96/) kwfeduph a 30-W resistor and a 40-mH coil if the resonant fre)9wwzpp -e /)kb d /6k5aufwlgquency of the circuit is to be 1000 Hz?

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