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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 arefn 784v1okmhyx/ t5w s units of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states tha*zfkb i2tt(wih0k*6a t 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 what kind of chan/ +igor66e(chx h tx(zge on the indueg6czhh+(( trxo ix6/ ced $emf$, 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 lo7:pd nq/mhjle -;5 iu,j. oxkpgrin/. op of wire produces what kind of changeg mjnrx-,5l ;.j qipu. ko /7:dn/phie on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change on the 2gjq1b; 8 xazzinduce1bxgz; j qa28zd $emf$, 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(2lnd)ad n 3qga yq;-bj0lro7 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 cao a*rp66ni,pe*6f nve- lts )0a ra1lonductor will be that which tends to produce which o1pef)nrinoaaa06*ea 6vrl *plts, - 6f 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 magnetp3u3a14 h1kgue;pspy euw.0c5io, c v is held above its center with its north pole pointing down. The stationaryaeusigkewyc4vocp3u5 u; h .11 p,03 p 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 horizontal6lpkinu sk48 2 table. A bar magnet is held above its center with its norsk 46 lku2i8npth pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where ku- y kq w5g: x-9lpqb.ioq2v4the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, 52 qo-.lu wqg:qb9 k4pxk-y ivwhat 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 region where .txy ocl4/ozhd 4r6d - b/.hchthe magnetic field vector points straighth/ t6h/.4cdco hlboyzdr-4x . 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 inxvr ( pm 2px1*.qku*wo a region where the magnetic field points straight down. The magnet(rvx*1pk xu.*omq2 wpic 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 eve;f;59 c rckfker-increasing curren;fcf59 r;e kckt 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 ax. hdfxy q)00rd *4kbwith the north pole entering first. As the north pole enters the wire, the induced current wi)0x04bhxdrd akf *q .yll 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 rot8s9np8o;58i m actob 0hhb +cuated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, wc bh 58au ; 9+8bp0tmohocs8nihat 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 wsr2mn(v2 * iyhs9*gt ehose direction can be varied. In a region where a uniform magnetic field points straigi( rvshm2y*t es*n2g9 ht down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be a maximum?

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Faraday's law.di wkj09 5oef+d r.d3 1p.lvqv
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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 xf5) drwa1+kz 2ud 5xzfau5t+that 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. The87gw *ev4y6 c y.xrjqg $emf$ 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 movedlcn: bdn :f4d-9uql y* northward at constant velocity through a magnetic field that poinnb9d*lf4:-cd:ql uynts 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*w( k/4fh ht fku7 .k-rce)rju 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 generator transformh+csaz: 6bo;b s

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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 revolr4x:(ydj1z xc utions each second. The frequency of the xd : rzc41yjx($emf$ 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 used8wrxpyrwcl++/zlr 6 h.6g*sop 3e 6wd to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device thaqcfx y7 c1 myox hby2) ,*igm2d;m6elw4f c6x3t

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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 the primc.k e,+qc79 obcwpa ;cary coil t.po7 kcqb ac+wce,9c; hen 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 l 1f-)l c/xdjf + kxg:imjgy0brca 5/1primary coil contains more loops than the secondary coil then1mlf+k-ix5 c//yfaj g0lrcx:b j1g)d 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 .ko2m( fpw;oc input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant sx.kb(u1do/bn.qsuexu37+9bgisf . 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 series to an ideal battesb q n :gqe:7v3juiijyv4(g3; ry of constant termi4eq 3iq gjgv7:yb:jvusin (;3nal voltage. At the 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 to an ideal ba2a(f tjsr:3 n ic:sz6sttery of constant terminal vos 3(sc ia6s::zj2tfnr ltage. At the moment contact is 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 annq1rn t1,l ;wa/z:ev ed resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L an az9 (e,r 3.axbdfny8wd 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 connecy ,z,. +sd*rvvyn( mxw1 pg;yvted in series to a battery. The time constantx,;vzvvwsp.n* ygmy+ y ,(dr1 for the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. Thb/p vz)g a3xa+e battery is suddenly removed fr/ +ava3bz )pgxom 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 uni) (*2 a;hqdiqg va 6famta9e7hts 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 currentts qg/05givf +2,io d+ rvfs+v43a hhq

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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, the cu+v7xe/xs j 9svrrent7ssvx/e 9+v jx

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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 circuisujf pf96 zl4ya9r.:z:msz 3vt changes by what factor when the frequenszvs 3:p:mfy 6uljfr9z9a z. 4cy is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the i+qwk )er/w,v unductive reactance k w,+/uqre)vw of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zera0cc*kdj xl c9 i6*pl9o, the inductive reac**lc cd0il 6k9j 9acpxtance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supb: yqz80 i6pla(s 9udcply. In this circuit, the curren a08s9z(qd cu6l:ipby t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactancexokefla0n ) 47.i1bf y;s:icg6a pr 1/v 6gfdl in an ac circuit changes by what factor when the frequency is tripled?v:gffn l.d1/6csr)xi6i 4lkog 71p fay ab0;e

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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 a-j:s1hh +4 i)falvzyccross a capacitor approaches zero, the capacitive reactance of that capacjv4i- ya+1s f: )hhzclitor

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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 betw-uz cxqwe1:/ l lavd5rjp:l /,een the voltages of the inductor and capacitor in a RLC seriqdlllpw5 e:/v:/,a-jr zc 1 xues circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined agfn1x k92z,k ws $\cos M = R/Z$, 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 i:ruhvfbwy*k4 (j 1j9 xmpedance of the circuit increases if R increases. When is thhuf j1ybvj rw9:4* kx(is 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 lwd,;hixbl1o1 +(v ob 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 incrwxbn)m7p.y tmhdim52 l-npj3z sd3 03eases 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 circuity4(a+ jo14kxyw+j z yr, the resonant frequency of that circuityjr k +yx1 +jazwo44y( 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 is2*zpv pbt):1cbjh c1o* lgm /s 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 cizl14 kd v+tb7//;w c dhiqlfc - zw19;la(cofjrcuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating ckz.3 0a04z wpglfh-j)fxm5) b8f dv qin a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the fdj 50 3g)ah-mcz)xk4lp08wfqzvf. bloop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uni 5;lktpibher03)il m2 form magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the li brht; ep32lk05li) moop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform mf5sr1m7ex; hz agnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mag5 m1z; hsef7rxnetic 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 reduce (nbjftlfcaan3)x45, 4qgp (aph:4c k d 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 fromgf.-h r)omlo4 $4.0 \times 10^{-5} \; Wb$ 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 kmdf qih+zfjw97rye1w 436 9y square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If t1hrke + q699yfymwzj d7 3w4fihe 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 dcc:au4ej -4yk /5e i7hzsaxge;4:vyturns 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 and t;sy2cub ,mk tt9p,:aw e0fn6area $0.20 \; m^{2}$ 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 o o)rqrk ,4g;qev1h*j flies horizontally at a location where the downward component of the Earth's magnetic;r,h k)e vg q*qj4oor1 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 49z:pypn) l g0tqht-g; rr/6p(plqvpm long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while lqphz-pgq/pr :p6v 4n)9tr0;pgy(t l in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area n1o(3f;bk92icq ocw dasrz.7n jd j3;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 a//ucl3 pb,ee orea $0.090 \; m^{2}$ 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 armature. Each loop i*j+qbtk,5bui d)hu9m s 12 cm long and 8 cm wide. Thkui 59b jbh,ut+ q*)dme armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this 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 are1r1 w:k *dk5-0vg3cvzm qm.d6c je,u ynbc ov4a $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an outputx.i,oj ln34l z of 12 V maximum when rotated at 60 Hz. nllo,x.ij4z 3 A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generas5 :zk3nz ufevmwf- 4a.;;mvptor 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 resistoc+vpv0y m( 0cn2i6zeance 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 W. The motor operates4jwes29 * xeme on 120 V AC, and when running at full speed it generateejms2 x49w*ees 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 connecteiv yr0f.tk zj;,x 4pn.d to a 24-V power supply. The operating current is 1.0 A. What is the start-up fjn4 .0zyv ,tp.ik;rx 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 resista)ew ej1wx -0wxa(p9oznce 6.0 W is connected to a 24-V power supply. The operating cur( ewaw x9-p jzexw10o)rent is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 2iits fso2 53qhcn-w).4-V power supply. The operating current is 1.0 A at full speed. Whf s3.wh )so5qtii2c-nat 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 rebg:*. csct2dj c eyy39duce 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/y f3z*02f cdn(zuurt /55g*rz yhbor a transformer causes 14 A to flow in the secondary. How many rb5zgrz*uz 3fy/ tuc oy52*0hr dfn/ (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 qrgl69;x /7iss*u8;/ 1mtqbfbro itb 110-V primary if the 24-V secftb;xmb9* q6r /iuq;bi81/grsotls7 ondary 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 se**n vn sqy cxim/m 2s-ce0h46(e6wbqocondary coil. If the current in the secondary is 3.0 A, wv*4nc2*ee/ (nb is6qmm sw-6y 0qhcoxhat is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assum 9,dkns*ong g1ing 100% efficiency, how many ams1,gog9nd k n*ps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7edwq75b,z5q+fgho i8 500 V at 10.0 mA. The primary q 8,d w75zbe goq5h+ifcoil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primarpa7 jrno(q8 y3y coil and 300 turns on its secondary coil. If 120 V at 2.0 A isyrn73 q(j8p oa applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its sb+ib, la a vuy)dl6a)0econdary coil. If 120 V at 2.0 A lu a)vy,)bbai0l+da6is 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 wxju6m 8*+q. rusu7af 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondary t+ j*fq7 us86. uwrmuaxo 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 hesj z t(,4c(3cjbkst4 /qpa z7y z75ngas 200 turns. If the input voltage to the primary is 100 V, we can expect the output volta(nqz t,5j kzcsps y gcz7/34t7be 4j(age 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 secon -t6hsax6us2 e;mi8 zzdary has 200 turns. If the power input to 6i;8 amz-xzueh6s2t s 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 A of cur0o8 i f8bwfwesut i923rent 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 number of turns in the secos0oiw itu8e32f bf98wndary 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 steppedb ck6nno5vd3,jog42vb 131g8l,oef rl eqjs+ 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 line.e1b+g1 rlg lovf4dc2o ,jn3 6v5 ksqj,3noeb8

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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 nzf )flm 3 w;2nzci9y;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 the3mfw2finyc) zz;n;9l transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance odhn /b7) mmn6mo3qt (vf 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percenmnd (hm7b nmv3/o6qt) tage 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 93vqw y(t +hw;snre 6bkm long has a total resistance of 0.60 W. A generato 9wvqr3t6enw(hb+ ys ;r 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 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 V. How much less power would s/dg7 09v7o cdoqk3lf *vxm4rbe lost if the power were transmitted at 3v0* ol rdmk73fdoxsv/qg 97 4c000 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 generat(;c xadnf k2h)l:,g 1yf7s wlpnj5 :odor is 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 transm sl)xjy72ad dk5wc(; nfp,hn lf: g1:oission 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 enerq8sx 2oapbc5e kacl5 /q(e 2*xgy is stored in the coil's magp ec acox8( e5l522qx abs/*qknetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductwkfxhr 0 )0.hyor. What is this circur0hk.)yhxw f 0it'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 yeoxhqx0f 4 6r;n/,ks 9)tt8 zbl9dulthe 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 o3p+u cb.s n;aqutlet. 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 jx4;)d2p wkeutt-s j0resistance of the laet)-t2jw 0 uj xpds;k4mp?

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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** p4bq niza ziei:lfs8,tt+9d2p7h r 120-V ac power supply. What is the peak current through the resistor?2 hpat8iz9* tq+frdlp s n ,i4ez:*7bi

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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 is the )uc(96 vcgzg ppower dissipated in the resist gv)p9 u(z6cgcor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is t fh/3 7byp+f+ fkx8imj7 sn0t$I = 0.80 \sin (240 t)$. 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 ave 4od+ ep,q9*sj1rusw3 0qis 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 50p0 r43.yw*hjbv4pm xg-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH ind 91ra-vmu h++thrke5kys mn/-uctor 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 ;v hyay, a8w6- vbd2ehqa8ek 9reactance of a 2.50-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 reactanceg t0fo,e r-1pf?

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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 inducti2iumz sc +5m9jq(i pn-8sp)adve 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 1ad m22 4dt4vo i/ns/pb20 V AC at a frequency of 20 kHz is a/ib no22sdmt/vdp 44 applied 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 throug)o ;vmshfim 1-h 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 reactancekkuc5vjv rb7e42h8o8q:vw g , 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 d- p/mm fayfak)hdc.(b 8nno4s3 u3u) to have 50 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 does a 10-mF capacitor have a r(tx d07i*tgaw t0ce ,keactance 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-mF capacitor be 10 h i-wjl/q22 vc)y k3zrgg(ix:0 Wg2iwz/ - vrq2)xgy (hc3 ij:lk?

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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 0.0010cm (e7c;mqx a *,k.txm-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 resistanczz4*j16vlz kslo40 xqe, 15.0 W inductive reactance, and 10.0 W capa q4ojl xsvkzz6l4 0*1zcitive 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 at4t/hv6rbmy - o( 3h*czu* brkt 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor aretm*tkyc *-bhurz(6r ho3v b 4/ connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hzg.:aq7u .ksmgcx +oh+ if a 100-W resistor, 20-mH coil, and 1.0-mF capacitom.. c+o guq7ahx +gk:sr 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 connected in series with a 20-mH inducv6bjn0p 7wg0dx)sun /tor, what is the impedance at 1ujx6b 7p0nwd)n/ s0g v000 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 w7gfmyhq9s jp+rp5+17faq igb42q8 c hith a 20-mH inductor, what is the phase angle at 10005fhgq2+4rj 7q icp+ y7f1a 9q8 psmhbg 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 6/ r8a9ejqh/ 1qw tfovseries circuit with a 20-mH coil and 1.0-mF capacit f/8hweo 9q61rvjq/a tor for a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W .3umq58a lid zresistor and 15-mH coil to get a total impedance of 110 W at 20 q5mudi z3la8.00 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,.pt)pcnq,c z a total impedanp),zc cqt .p,nce of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must bxzij szi6e,3ck85s9qe put in series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 5 zczix sskq869i,3jekW?

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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. Whau6e9agk ss2) o2pyqn +1m c3xnt is the impedance at 1000 H+qumks x2 s2 n6pc3gony1a9)ez?

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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 catn3qg93rp:.ve c fjg -pacitor at 1.0 kHz for a total imegvg j :qnpfr.t-339c pedance 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 i*.b* qc.:e4 jdfnhdvq n series with a 10-mF capacitor at 1.0 kHz for a phase angle of d*hed4*vcq .:bn.jqf $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for a 6dq vtr2:n0twtotal impeda r6tt:vdw2qn 0nce 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 n64;a tmrsjvh;i +k7c 100-mF capacitor at 120 Hz. What is the phase anglkc nih;;4tsr+ 6maj 7ve?

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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 j*6lj)n1biw(zvbd4 a b )i9h vif a 100-W resistor, 20-mH coil, and 1.0-)(iahni9jvbbzd4) 6 1*jwlvb mF capacitor 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 10.0-mF capaci*x/vb ls20xr- s qseeq/wsb .1tor, and a 0.350-H i-/eqb 12xsl vb 0srx.qw /sse*nductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an inlsyw:cr4q 2b8 ductor of inductive reacrbw:q48cs y l2tance 30 W 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 series RLC circuix hqb.(,t ,tihaehv/qsh;u*6 p n,tx8 t containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor,xet,,.a nq(i 8h p thh 6uhq*;sxv/tb, 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 500yx 18ummkr3 o.1shml *vu+gm2-W resistor for a phase angle ofolkum2ug yv x*m.13h +rm8m1s $40^{\circ}$ 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 hqx +x-vf(3el u+ hl3gfb;va( = 10.0 mF. At what frequency should the ciula(q;3f +hve-hbl g xf( vx+3rcuit 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 circwn2etf(u.vo ,v 0vg* cuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the vn*v fug oecv.tw(,02 circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit is k;;0kqyvkco/ $63^{\circ}$. 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 impedanh+.m:t;eal4 p fg,ig m-z;hski 78pksce of 60 W and a resistance of 30 W. What is the ;mse+ im .7-l fi:4g,ktz gph8akphs;power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 504 hqvch(5tuv+;- piu9)ff kua-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 6if4vf (utuu-cahq;kh+5v9) p 0-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 capvs 1ktcu kl- 8mk0cs6bjtd /-,a98 xpsacitor and a 15-mH coil in series?ucjk 8t t,cks6-18kv 0/9l-spmbxdas

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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 capacqx (vqx7f/ 7zuitor for a resonant frequency of 10 u/ zq77xqx(vfkHz?

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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 . du 49gg/xk+pdd: ndqin series with a 3.7-mH inductor for a resonant frequency n :+/ku.9 q pdg4dxddgof 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 resistor and a 40-mH co1 v8 6,vn)gvdxtvb7 sqil if theqv6vt v,sg81vn7x)db resonant frequency of the circuit is to be 1000 Hz?

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