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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 exuw oo + avoll;/o; z-7h.owlf.cept

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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 +yyzm hpc hnx/9ot8* 8that 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 kind6pq.c)g rw*nnep m7ymjw9 /:f of change on the i7g.q ) cy9w fmwnpnj*6mrep:/nduced $emf$, 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 loogp26bpzzh (ze:,jf 9tp of wire produces what kinz,z 62pge:(t h pbzjf9d of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of changg -/;wq;eg bzp:z+q e9xanf .ie on the inducwig/ e.g+f:pqa z9b ;-;xzneq ed $emf$, 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 magneye()4zc w.a.jphz z e6rhx55j tic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an indu pml/2 (dye :x gvptxb+(f)g9gced current in a conductor will be that which tenp btxv/ yg:9(+)pg2lgmdfex (ds to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held abo-mtdu 9f, zw/ove its center with its north pole pointing down. The stationary magnet induces (wheudzof/- w t9m,n 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 magnet i+:;c:drb,ks ybf ew (ro:0v wcs held above its center with its north pole pointing down, and released. As it approaches the creoy+: :wcdb0fc rw;b(vk,:s oil, 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( wrc 5*9qwvnk vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this cq*wv (9k r5ncwoil 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 e ug1;i dspdx5gkmw1813vr0yin a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil asy gw8mur3s 1ixkdp05v 11ed;g 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 where the magnetic fie4ojjrnf1*2 rc ld points straight down. The magnetic field disappears suddenly. When viewed from above, what is thj onc42j* rrf1e 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 l ,o:h00lip/2 wu nyni w0i/;t/rx*xiaiov;f and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either sivx/oi;twx 2/a ipn oh,: 0rf/l;in*lwu0i0yide 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 thea.g66e d nl7wu north pole entering first. As the north pole enters the wire, the induced dg76an uwl.6ecurrent 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 cl :4;7c / whnmz6v vwcx)ys5sspeed 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 rotation if5 h64 s/:msc; zcwvyc7lv )xwn 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 abrg a -1f9r d6zmx-;klzout an axis whose direction can be varied. In a region where a uniform magnetic field pointsz;f9 azg6 r1-rlm dxk- straight 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.z.sqgsk e. vqom:v,, *
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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 thatx / ,d:c,ptcws*g/*mz yphye8 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. um8 w r oq(d1;oq-mj+v 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 move ae-(tvd4 1i x-vy1nqnd northward at constant velocity through a magnetic field that pointsxne ( -d qiy411tvnav- straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a constant angular velocity dblfal. f;(.3 nham5f$\omega$ 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 transformf+f(w wjip)4j6gy +;yq/eb gv2 xr,kxs

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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 t vh0hv- 9,m;8om cvlxyhrough 60 revolutions each second. The frequency of tl vmc,x yvv8ohmh9 -;0he $emf$ 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 i1o.z j:grpki:d/b t,o

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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 th 9-tlz n/hgdc8at

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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 thanej,wktky;yu vmf- j(44u6, me the primary coil then it ise4vkmm-;(yf ju4e6,jw t ,kyu a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil c 3j-g*(so4yvelgt nc4ontains more loops than the secondary coil then ivectj g4y3g(-l n s4o*t 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 inpuo e0vgrlod(fhe; +v .k1l g47st

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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 ci:n ) 69apahw(urtp12 8ogl ekcdd:k-v rcuit,

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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 c3 hu qh3iblf -e9yih,*onstant teri*euq h9hhyb3f i -,3lminal 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 ba*ggv2/lnh mfgcp v *.dfgb36* ttery of constant terminal voltage. b*236vpg.l /vc*h m*gngffdg 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 and resistance R is connecteb)e3 v btzu)sad(4 jz0yh z:)ud 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 ind 01t3xp2gki joxls p7mv(h-r-/ p hri9uctance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series um;xhk(7/9xzuk ) symto a battery. The time constant for the 7(xm xm ukhy /;skz)u9circuit 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 se13 b.oyjnfz. ac 12bzvries to a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decreasjc2nb3z .yvfoz b1a .1e 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 th:y t2xbujg i-(qw or.1e same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circg nw+ay 9k 6gt0x.a3fauit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In q cgm;1a ei8k,this circuit, the currente i1ca8,gq;m k

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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 bzb 0oxmp,z 96as8p1uxw p(p17v+ fbxii 2w6 dfrequency is tripledd xma i 2pv b1i6s1w xup(78bpxofz09+ pwz6b,?

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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 Avj3odmrn li81z t8.ksk+;,g * bm(dxl C voltage across an inductor is doubled, the inductive r.oxd+8m( k*lnz t1s3ilg;j md8v,k breactance 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 tbwlm8 ,cygocez4*6 ; lhe AC voltage across an inductor approaches zero, the inductive reactance ow l ;4g*czym ,c68oblef 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 connep 41c*8we9if 3 vlvygq-nj2r3:zshtn cted to an AC power supply. In this circuit, the currejvgy zpqv328: 9s ncti e-wn*rh1f 4l3nt

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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 circmt.2-/: pnap ea sbw7huit changes by what factor when the frequency ph/7.t bm2w-a:as npeis 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 approach u1wjng4n6j-m q as4ckzg 8ls45 b.hn7es zero, the capacijj 744hmcw 5u kn. s-gzs1g86lqbnan4tive reactance 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 voltages of the inductor and ca6 m4 )tafz4ylwpacitor in a RLC series ciw44 zam6 )lytfrcuit?

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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 circui*bx ga :ha ia c*8+r*rubmi7sxz3f;+ct 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. T69)1e srhd tbohe impedance of the circuit increases if R increases. When is this stateme 6dh9)et1bors nt 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 e5) penwo-ww6. The impedance 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. zdc9)u o-v vj*zir.3z a(k,ex The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC seri/ji; rxp)nkl*wrnb-. u9pp 5mes circuit, the resonant r*- nwnu9jkpx; pplr5bm i./)frequency 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 circuit that is*xhoej8d1wpsa , *7ca 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 circuitfy;;ux fe0.k igr82hs occurs when

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

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniffj/ea8 /inid 3orm magnetic field of 0.20 T. Find the magnetica/ /i8fj 3iend flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fiezsq6ne-cx*l hz+ 8(t vld of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vv xehz ztn6lq- c+s8*(ector 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 unifogzw7iqoo 97owq 8d :f4*.dbzvrm 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 .w zo7*fdz87w9 vdqoi4b:ogq 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 s1v -7eskyxwryi;8sd ,.l:b ( c ndhlf:ingle 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 chag6px*c /p ftruja+n, q5k*q)onges 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 wit6 8g ms)arw;iee-w (rvh 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 fie(i erw);egms 68-w ravld 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 awq 8n;5p,uop und 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 aaajzi ri5n0,5 qh9g. erea $0.20 \; m^{2}$ 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 z1myo /tp)h0har 3izzyi4+. klcl1c6 location where the downward component of the l / izk)z4hmcahz1+i.prc6oy t3y10l 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 constan0. m,ty2t-soi fsl lr((t gp)rt angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magtltyr ) g,((fsslm2r.0oit-pnetic 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 looph :*q;pnys 7vws 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 1( .j(vy *rfuzg00 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 80 rectangular loops on its armatu1iy+.ublne z: re. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long siely 1.z un+b:ide. 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 ture * /d01 f4abqng -4rxabq ::1sdmutkxns 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 com,on2iev.hex+8 *w,axqk9es3i 4 jsjnstruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is availa3n.j*i,e s 2k+4w vjexa9iom8qse, xhble. 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 6 e4g 5lbulujj*r9kjw7js.q .generator 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 havevj9iarof 9u/sgouz4hs,7 3f3 a resistance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor w,n vfz9st2x a-pak/ 78cpt0v operates on 1t0,2/ w7aapvctps n98z v k-fx20 V AC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. zxb14cxz *- ekz7.ttwy87oui;e dpp0The operating current is 1.0 A. What is the start-up b4z -tz1ppx0e et8.cxuizw k;* 7 7odycurrent?

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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 resistanc7sdcin8o s1. wdyx3k8e 6.0 W is connected to a 24-V power supply. The operating current is 1. s1ynd7oi8sw xc8d3k.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-6hmgwnn(g+/ pop l z14V power supply. The operating current is 1.0 A at o pmgplh6 1g( /4+nnzwfull 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 primary voltage ohbl 6d:wc1uey5) rs i5f $120 \; V$ 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 flf(ezl ir4 16f6pt 83rsinb*5kqj2jn wow in the secondary. How manynfi j1rl 6(k w2 ji5pfn rt6ebzq48*3s 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 h 9l+o8op ua7b110-V primary if the 24-V secondary has 1 u l+87hpoa9ob00 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 f0 iv-xxi -)zb500-turn primary coil and a 2000-turn secondary coil. If the current infbiv -z-0i) xx 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;zsn,1s w.rm25al ocn in the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondary?1 z5nln ,o ss2acrm.;w

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 2ofci**wjcjsyb07 )d 10.0 mA. The primary coil operate* b7ijjfsc2w*)y0 docs 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 tuvd z00u)ymc 3vrns on its primary coil 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 seco3uzmc)vdy0 0 vndary?

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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 atuwyjo v 9m-q,dv5nx9+8m+d 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present xq +ova+y mtv-j8,5dw n9md9uin 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 transforme a .qzr4fis(pnsx110zr has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, wenf0 ps1a(xrzs1 i4z .q 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 turnsy,e5cv+; chxf and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to bey+fe;v5hxc , c

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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 has-)xak 1oex 93tss,btb 200 turns. If the pow ,sk)3e1x 9s xotbabt-er input 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 A of current at 120 V. The voltage is usually stepped 7ksf3b2/oi5qi 4w q phjcuq.-up to 4500 V by a transformer and transmitted through /bc 3wsoj4ih5pu. qqqfk72i- a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage in j*wf8ew1 hn*3b t/nys usually stepped up to 4500 V by a transformer and transmitted through a power line of total res/8 nnwe*thwny fb *31jistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The volta8b, (kkfb p+dage is usually stepped up to 4500 V by a transformer and transmitt8bapb ,k d+(kfed through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission linhmnn:e8wp8 89 jylr. gu, zr,-nqavt /e 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to he8nuymren:l , v/jnhwrz. g 8q-98,ptaating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A genetf a2t :6a6qw,viiz) wrator 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 percentaga 6z)2i t6ft waviwq:,e 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. Ho4/.qqfv mm/ yow much less power would be lost if the power were transmitted at 4qf/.mmvq/ yo3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20pf z 73kmh5ij, A. It is to be transmitted on a line wip ki3f z5j,m7hth resistance 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 iwj8eeb5tb1i8+ *b jrps stored in the coil'e5ji+ bb8j ep1*rw8 tbs magnetic 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 r1 //wtndj8j0 u1gqf aiesistor and an 18-H inductor. What is this circuit's i wu1/nfj a10qjg8 t/dtime 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 voltage isy) sx7dx4zrx3v ka6+s 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. Wu2 7p+ptnjsy ,l 4gbos;.xl 9. q*oz.f youkt)hat 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 placb 7 k4evcse;q2ed into a 120-V AC outlet. What is the resistance of the lameqckv2b 7;4esp?

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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 9 +av/eino)topower supply. What is the peak current through onit) /9 ove+athe 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 calefa3t 749+wftqj q (onnected to a 120-V ac power supply. What is the power dissipated in thef9weq a +34qaj(l t7tf 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 am5(h r aw9 ew vkw-sap:0ssw;+ 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 50gjvi-ieot6a wb*p (v( 7;-rox-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-Wei213yf8m z,mfl0mhahc w-(c 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 130o2umstu z m,x0 4bp ged(jzof a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a (h b.kofcy0+m 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 havegu yu8 8+q+jvz 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at 1000 H7gqh: .2:vd.8ewnpwqcj;br j z?

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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 kHz i(fi8zgka w, -f 3)mvkky8fl4)rza 3ab s kf8 r33gzb (zw4a)ak,f8miy lv af)-k 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 throutjc)tj02d*dl ca*5c bgh a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitn)d02 xjs,kvx 0n 4qtupxy:e+ or 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 capacitive reactance at 10 kH(hs,mdrxhir i rav i92))m7y( z?

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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 capaci+gp :vmsu(uk/-nfjutu w /d .;tor 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 0.010-mF capacitor be 100 W7 fnudinfk ax 8hbyf/ ;om6 rw8.v.:x8r.7yhx.:8w bfn8 vmxf/ ;8ofni aku d6?

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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 capacitor6-,* hal:yd 7rupugz t 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, wqqfyz ) /);ce15.0 W inductive reactance, and 10.0 W capacitive reactancwfq/; )eyc )zqe?

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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, z(*k6p.dg g)uza,(mq 1kkdp a20-mH coil, and 1.0-mF capacito(k zapdgakm. ) k1*,(zqgpd6ur are 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 150snpt;j gvj z9 e:)yszc)v3(b:0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected t)p )gyjc n:v sb;jz:39sv (zein 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 resistori;div:4a gfa1k y-g-i is connected in series with a 20-mH inductor, what is the impevg g;dfi4ii -k:aa- 1ydance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in seriesfxak) f5w053vhj,tm h with a 20-mH inductor, what is the phvat5 0h wjxffk )3,m5hase angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mFw6e-an/skxh7 *ab u )x capacitor for a totxxkhs7a -n /e)b*wu a6al 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 resist5 /cujc3h u p()06kxbgfp/oosor and 15-mH coil to get a tota/hpxcf c6 oou5sgk 3bu0()pj/ l 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 w+use 2hga-8 xyx8-kd kkzz3 h;ith a 450-mH inductor at 5000 Hz for a total imphyxz ka8h2sd 3z+--8k kex ;ugedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz fqy2myus..6dj0j4me9 w3l- jglv tq5l or a total impedan9. m4yu5 vwjqlsl23yldj.mej tq g-06ce 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 connecjwmb2ste d0p*f *u04q3epu m,o6;v vcted in series with a 20-mF capacitor. What is the impedancuwm*qd3*p0t m ejcbev04;ov us,f62p e at 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series * 2hpb)b vqg/dlm9 qh)with a 10-mF capacitor at 1.0 kHz for a total impedance b2 pbqlv * gqh)hdm/)9of 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 net bz*4e7kul 44zjszn9eded in series with a 10-mF capacitor at 1.0 kHz for a phase u74e 4 zs b*4lkt9zjnzangle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resi uyavc .8dpl8 zc3iyh c 5ln/.0)xc3scstor at 1.0 kHz for a total impedan0.8xi cs3zp 5/)l ylcvc. ccd3y8ahunce 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 adi8k 6e8xb6fnja av+.lo8i+fjw 6e,v 100-mF capacitor at 120 Hz. What is the phavefa+w iaid 86jn o6jb8fl 8x k.ve,+6se 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 1 psnxg 2(0b9iq3b.eo.5 o fquhokab03500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?25q9ix3a 0 3kg(p sqbo.0eb bnhuf.oo

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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 capacitw1+og4s g4v t*0g dyknor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-H4w v t*og+kgs1dg 4ny0z 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 anb3:et7l;je h0 4 cwvuo4fljr6 inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. Whl jfe j;40 lhc467ov3tu ew:brat 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 fmr(yloo8 v: n1or a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suppl:8o (lm1ny rvoy?

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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 resis.itm;1 vjruw7 v)uh)c q-s*q ,bt tq6jtor for a phase angle ofu . 6- qhcq;tv*7 uj, ttbw1jq)m)rsiv $40^{\circ}$ 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 = 20a7w 1xcds 4rzogc bz1-l4jq57x xm97o0-mH, C = 10.0 mF. At what frequency should the circuiw -r49bq xdx77o41l g7oacz x5sm1cjzt 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 fuhm0k*ben 0+ circuit with 12.0 W resistance, 15.0 W induct 0fuebmk *0n+hive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of a erw-iuz j mv8ehc9swnj+jifq* ) 894.n 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 and a resistance of 30 yl 3s5zy2xs;t tl-qirb8ak7, )+mctm W. What is the power factor?r l ;kl t,8ztm) 2ms7s3yytcq-5+x iba

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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 50-W/rar7.h 5ap v3yu ta2d resistor, a 10-mF capacitor, and a 0.45-H inductor, when connecte r 3dt5paaauyv.7 r/2hd 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 jm*jxdm v 3a;3a 15-mH coil in series?a*jm3d v ;3xjm

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor fo;+o4i)pg rw0a q+(wdw,ks milr a resonant frequ0g qw +a+ m)wkird4,lswo;p (iency of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor 3kg8rre f-7 eoa/* pwu*jujx7vpf3.-:cuvbx for a resonant frequency of 1000 Hzc3p-vx*rb*v3 rue w.g/ 8 jxk:fu7uf7je poa- ?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor wg-/kgbs to5w74 6ht7t mei1 omust be placed in series with a 30-W resistor and a 40-mH coil if the resonant frequency of theegg/bws5k- o7m16tw t4oit h7 circuit is to be 1000 Hz?

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