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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(nee k,:x wi)i mm+j6h are 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 thald 7;pk0q()e sb2hytit 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 chanfh5p ra2q +ynd,( 0-st ;8dp;rr8wfrew s;jaege on thfsyw +a p p nqrh are;(0wt;-8j8f;rrs2,5dede induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the mafpup *llt/x5d4-oi6nm 8r q)ggnetic field through a loop of wire produces what kind pi4n mlg utx*8-5d)/fr6po ql 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 cha .xa zhu/j;zwywmb29r l 6,1dynge on the indu61wrm j;zh b2ya zx/.9lwu,ydced $emf$, 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 f6d dpuaxfowhwi k; *8o+8 34pcrom a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law,wqui-, y jt6*to :d2uf the direction of an induced current in a conductor will be that which tends totty6jo*:iw uqu,- f2 d 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 above itz*j,5me rt-2yu x y/pos cenj 5 uz mrye/yt,-2o*xpter with its north 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 fkgci0405kbix3f 0* bwg+ 9 p +qtaanrxlat on a horizontal table. A bar magnet is held above its center with its north pole poib+ipb4a 090g0qrcft wgk kxax +*3ni5 nting 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 the mausal 0 -9p7kslzd a0,lgnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the lal9 ks, 07l zsd0pua-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 the magnetic field vect8 ts.t0twse-t p4tmk7 or points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in -7em t0tst.8tst 4pkwthis 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 where the xbg3 *(nf f5:.wrrchqmagnetic field points s(frgwf:h * 5q.cr n3bxtraight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever-increasinn osqn6z74/utg current northward. Tq t/z7n4u 6onswo coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the no3ur:c, dl ;uodrth pole entering first. As rd3c:,ulud; othe north pole enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rhr3jtn:) vi0mm p53)r, oqmwzotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rom0) htz3prim) w3v, nr5 :jmqotation 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 anguw3ys ms*x.fh vsn mu,/ (i(n9klar speed about an axis whose directioi/mfw x9n 3 nv*((.umhssys k,n 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 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.o6iaoa g - 8*lusid;987ht d-fj kvw:a
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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)exdr .yb8v7 e( -b9v y,ujpuw 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 magnaleakq ij*ex o(*uvz) m.,, vv/c(7kh nc2 ft5etic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved no ayfx66 ;kv)dorthward at constant velocity through a magnetic field that points straight down. Make a statexk yv6da 6)fo;ment 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 baraxd-ly8jfy2np( xja bb3 )y.9up0c7j rotates 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 generator trae:05b0a cqm ggis. y)qnsforms

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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 i+ j(si0gzmlk g1i+x lt,2 7odthrough 60 revolutions each second. The frequency of the kx gs7,ilt0 +migl zjo1+id(2 $emf$ 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 u g;w92ghbsd(n:i og(r sed 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 thatzmu;s taf ll7 y huv8:3qj-.9u

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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 cot+6 h1q b*fkeoil contains more loops than the primary coil then it t*oeqk 6fhb1+ is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains4 qpouep*0s4 s more loops than the secondary coil then *4o 4ep0p susqit 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 4en-59. sjkr9- sxdd8ao ldz lpower 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 resonantqd z:h6,vth5ic+(mx j*f4m0 leplmy . 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 ideaalpa)d i(z,k 7z.uhw1l battery of constant terminal voltage. At the moment1z 7huaa w ,zdi(.p)lk 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 iog*bcx mdc 259deal battery of constant terminal voltage. At the momentgcb 9 o25xmcd* 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 (nk0o73v8ifs7ufd r:m lwx.rR 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 Lkw (;j,uyfpapw ;c4;k 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 arq5r0 xo5ot(o qe connected in series to a battery. The time constant for the circuit represents the timex (r5o0o5oqqt 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 t 3l2 ,(otglmfpo a battery. The battery is suddenly removed from the circuit. The time constant fort plfg 23m(l,o 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 units exceptk + )regk/v*r ,jtsfl5:

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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 powerw(/ jsn n 3s;ou0zuw9 /ygkgr: supply. On this circuit, 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:k vdcllbrguz8y.wvu(+v( 6: supply. In this circuit, the curreny: (.6gwulv8crz (l:dbkuv v+t

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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 ci)jp8 7.lof. zu rju 9ib-gi+nbrcuit changes by what factor when the frequenci8lup+jfg jb. 9izr-)n7 uo .by 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 aczj s*9i(v 48eq+xk weoross an inductor is doubled, the inductive reactance of that induc4kevj 9x e(s8 *i+oqwztor

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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 inductoyd9n 3kyvps352hj gf 2r approaches zero, the inducyfs phkg v33yn25 92djtive reactance 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 aid5yv1 lf;w/h n AC power supply. In this circuit, the currenthf vi5yw;l 1d/

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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 the freque7/su5ri .x) clv(hxe incy is triplshe /r( )cuvi7x li.x5ed?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the cats j+ lt7s0ll17y qf7apacil7f7sll a7t+ty1 0q jstive 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 bet8k em7cz7ff ieh5 s9v7ween the voltages of the inductor and capacitor in a RLC sef77 fmecie9sh58v kz7ries 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 6 xk tx 6j6hli0westk)t35ab-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 impedan rpz8ul (q+/+r.xdwzpvo2 ay .ce of the circuit increases if R increases. When2+ p (zzudy.o/l8 rqw raxp+v. is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuitkcf67e)+brsx jkw 6zq7f 8/y o 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 circuk+mal9kmd 81 nit 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 n xk:ud6pz* r/LRC series circuit, the resonant frequency of that circuit will 6:rx*zud/ pnk

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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 resonance,tcw39d4alx poztji *dfs .k0l7 /0,vx

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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 o+2ju 9/h3j *ml: ifusyzh(f jeccurs 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. )/.qn*psb/e-b) hwtdqp dnx-10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plaw -sb)pb/n*)pdteqq xn/ -dh.ne 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 fields8gjc)f.7a7q3 bep kc vl7g3 46a 6kefuvh5wd of 0.20 T. Find the magnetic flux gcvda bp)4f7kes67e 7 lgc 335j.8vfuh6 kaqwthrough the loop when the plane of the loop 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 rgfcbz a .xyt-76n*i,6u g5px - h ct(9czq*giiotating in a uniform magnetic field of 0.20 T. Find the magnetic flux throuxg- *czq,bizuinc-.ht6 i9xg yp5t6 g *fa(c 7gh the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable jreb( vtqsg6 c2c1s,)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 coil fu m 92-2ixhvbchanges 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 with 200 tsu(.cs0iljho.mm 6:z, x7r 1 ygo9zpz urns of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil7sjlur1s.m9z:zgcp . i6z(o0hyox m, . If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an td3nne;.dif/tmn ex,hz)hrk (c36h 9 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 area d (-,v fcxx snhdr(y4u2;;nhh 5.uez s$0.20 \; m^{2}$ 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 qrqf.f*p0h6 4)td knk horizontally at a location where the downward component o).tn dqfq rf 46kkph*0f the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a constant 4 g08tnq,mo4trbr rr; d*2sf t(t1cyjangular velocity of 2.0 rad/s nj 2*b,qdg4;rmtt1rs 4rto fc 0y8(t rabout 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 has 50 loops and a c x (;bnzra,g7aross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of areahwsu)o 3*p +0yq z*akbftsl4. $0.090 \; m^{2}$ 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.ieu;e 8n (qmi3 Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output volee 8 u;m(3iinqtage 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 w54mp 9(npnud8gm+ 7lvgnvkj /ire 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 constrayd44-+v3hvp 3hbu / sx:bkgvuct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the uhapd3:xhv 4v4/-+y v bg s3bkarea of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator wiq87d.rwyu9k wnl( ;we-to yo;th 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 motorl:38a+mswcr s p qu4m 9(nqv.m 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 vr sz0boq yb*y5*+xz +motor operates on 10ryo*zbvq+x* b +yzs 520 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-Vqj5xg* 9gny 48lw)elu power supply. The operating current is 1.0 A. What wg9yxj)5 4u nleqg l8*is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connecdckqe5w 2k*a 5ted to a 24-V power supply. The operating current is 1.0 A at full speed. What is cak5kqwd2 5*e 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 k :cyi/ty0bm82 rj, qjconnected to a 24-V power supply. The operating current is 1.0 A at full speed. What is 0y/icj :yk ,8t2jqm rbthe 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 voltagenqni 2q34q)bfs v49h r 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 inb,xan4v3)jo x m2q(+z ,aa sgx the secondary.gva,bj, a qan mxxs32o)+z 4(x 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 i 6zw18y wvgbfn* /it6xf the 24-V secondary has yfb ww6 nt* i81/g6xvz100 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 primaryskl6nuz zm/ eofsvy50px i:3 d)j9/4d coil and a 2000-turn secondary coil. If the5ujk s 6s3lf d/:y pz 0dzomiv)/94xne current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows6 oat5uk/:xum csm+w/.0p c qb in the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V c.+a/:u0 koscq/6tw x5cbmump an 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 transf:ci+o)t) 9tfz0 z(h0mo 5beuv kz(bxeormer provides 7500 V at 10.0 mA. The primary cx:bzfbt()(uhe+ cv0to)e zmkiz50 9o oil 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 habq2-s ltq(app h+n -4rs 60 turns on its primary coil and 300 turns on its secondary coil(ptrb-hl24snqa+ p q- . If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns 8memi -w. ao:/;mkxot on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondaaeiokx- :o.8m m;t/wm ry?

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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 0ctta6 k w;iqlbj8b2+aru-3oand its secondary has 200 turns. If the input current at the primary is 100 A, we can expect b6j+r; ck b2a-0 t8i3wuat oqlthe 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 aw7la s;3q.myxb4:jrf nd its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output volrq xfj3 aym:s4 l;.b7wtage 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 tra (a zlddk0+*mansformer has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictionaa +*d0zml( kdal 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 stex472s41(+8 zhrmv* n5n*u hjforxqk jwt ,ulapped 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 secondary if the primary haxwha js+8v4o 7n( *ul jqh kuz,xrf nm*t4r125s 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 1208;c6 z5 tbilbcj),*gz+ob(d i/5 c) zl hpyubh V. The voltage is usually stepped up to 4500 V by a transfob li+6 j )cbiu ;c5o*58phz( d) bczhyg,bzlt/rmer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 12) 9n k8kwkndim bja7:*0 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 transmi8d iam7bn:*jk)9nkwk ssion 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++ x3vgxyy9s a,ahmqj;k a 3tqb 5p0 d5:gy-ja has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns h0qp a9jkb+ds-:vgay q g 3a,5+yxat53mx j;y 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 lm+wxr2oe)ov s- b)3 l: t9izheong has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce en3 vo )x:oe9imle wr+2- )hzstbergy 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 l 0n qs6ev3:vxfine at 1000 V. How much less power would be lost if the power were tranq nsef036xv: vsmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20cg+ jcl4v )9bv A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the vl4+ cb j9cg)vgenerator 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 u+x2et dkpa1z9jt(o)i/gl2h current of 5.0 A. How much energy is stored in the coil's magnetich9io u1+dj)/ te2apxtlz2gk( 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 1/rl a9e d.x9qe8-H inductor. What is this cirdq9el ./arxe 9cuit'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 c p do y:3w2i+rkmbi(g7ircuit 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 intaghkrf9+la z9-:ut s3 o a 120-V AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistancei- 95mcjd 1)gcm;fq mk2s6lbu of the lamp?9mc5 )m;s261bk-gcdumfl q ji

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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 (;6nww/g qvvs120-V ac power supply. What is the peak current through the resistorws/gw(v ;nv q6?

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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 powekee ukco3t7b(m rf43 ,r dissipated in the resiste74eu ( b3,kf motkrc3or?

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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/ ;sqhy g1xwc0-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-:ktcs.l z-p;+nbdn j 7W 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 resik;kfv((z a5 wrstor 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.+1 2nj*i)f k8y typzwa 1bk;tde:yuu.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 hfwe3*fa- 1l m49qdb 5kdxxq10gs9qpa 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 o w+led d5(d j4bj )d-a.yt5. uzbgzsp:f 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 jm)jwx a (9pyx:es-dcxdk:+ vp3d ;tkh sm*3 .inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20y0r8)ngeptuowb(o*/y4 u 2 b a kHz is applied4gprauyo uweby) b (2/80ot*n 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 i7i4dx 8xwf)l 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 capacit /gjrti: vhp-(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 capaqtz4k+(vq/r q)u5 iracitive 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 reactance of:h e.k e p5sr/bu-reeq+2u cx1 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 capacit9cc+w 8t vvq6sa/8 ua *w1aybnor be 100 W /8n aa 9u awcyq1t*8bscvv+w6?

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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 capx)lexj(x176am3hd1gq:yz * 8jxdm g racitor 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 a4.z+ ax:f 5gyx vx pfir70c2isc series circuit with 12.0 W resistance, 15.0 W inductive re7x5xf0 4g v+2rsczaxy.ipi f:actance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH 506gsaoyg8v4(4xq ihz d+ g,zk4 ctlucoil, and 1.0-mF capacitor are connected in serisz4q c(t+,l5y6khagou4i 4xgz dg80v es?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF y opz3r pfcpm;(d a/fe)c :/k3capacitor are cepf:d33/m/ rzpk);cpoa y(fconnected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is thezmylnv ,oakb42d 3,bb3 u9bp 1 impedance a3amu,bny 1p 9bd3 k,z bv24blot 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 series with a 20-mH inductor, what is thb kcu0w* kj7 t9m-sim:e phase angle at 1mu0 9jtc: *ms7-kiw kb000 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 3:k/a 7e8idtgx v+k7e3tew: zkq8s hm20-mH coil and 1.0-mF capacitor for a total impedance of 100 W 8e3hg7e 3kw/+etqks7 ztxd8::iamv kat 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 ; 8vp7tawv6j;hzl n3z:afy.v*ps 9ko i5h sq* resistor and 15-mH coil to get a total impedance ofn5at8pvv;fpsl . zzh **wv:a9ys ;q7 jkhi o36 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductorud +g 79qco-ap at 5000 Hz for a total im-do upg9+7 caqpedance 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 7e9) ptwn3y5 gn)m)ropprvv i- sl69h100-kW resistor at 1.0-MHz for a total impedance of 1)r ip7rpvp)swl6 -gynvnhoe3 5 m t99)50 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitor. What ieuk8 kvyd f7 )u*xjsww 5x,4p1s the impedank8vpy)s jew*k w41 x,7 xd5ufuce 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 l4*)u pn+v7 xhfh;dzpc 4z9pqseries with a 10-mF capacitor at 1.0 kHz for a total impedance fpq u7 ch 4v9;l+znp*p)hdxz4of 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 ajy/ rbk)ycfo62++kyler7gs 2 t 1.0 kHz for a phase angle 67 yeys2oy2rc/j)r k k+g+fblof $40^{\circ}$?

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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 resisto 763setf92/ 3 cgsb)izm pkwtrr at 1.0 kHz for a total impedaibce33s/7 rws2k mfg9z tt )6pnce 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 nsv)cvho4-j9-p -wwh100-mF capacitor at 120 Hz. What is the phase hc)vowp-sh9 -nj 4w-vangle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil,bgpcb)2e+g b zcc; /r( and 1.0-mF capacitor are connected in seri/g;rb b(+pc)e2czbc ges?

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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 consis- -j 2/0k)icls srstygts of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The /r02tsk -sy) glsijc-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 reb 1k ,4+i,ynlq:c rwxit y8u+j9nh- slactance 30 W, and an inductor of inductive reactance 30 W arenth ,:+j,ynl9ws4 1xqri cykl-bi8 +u 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 foy(l1yeah th7v0 c0to ,r a series RLC circuit containing a 50-W resistor, a 10-mFythc te0v (1lyaoh70 , capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessar m1k*duq(3riyz8x zv*y in series with a 500-W resistor for a phase angle of qvy8rziudz*m3x*k1( $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequemif wn/ f :e)fv*x/ko+ncy should the ci ev:)fi/ kxn*wmf /of+rcuit 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 inu--ike n24a h;z tkua, an ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V powe2kh-a -nu iu t,;akze4r 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 l3o-y*qlxnycujde2) sr8 8/w 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 mbtjw98 o+*y4 nab8 6jii it7rof 30 W. What iswnbiij7 jiotm8y6t8 9b r*+a4 the 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 50-W resispia4 lol:n d;p9+j2 tltor, a 10-mF capacitor, and a 0.45-H inducp d :i4+o atnl2;9jlpltor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coilg8rstki2 n+d7w o8xq, in series?sxn,i + tk8qd w2rg87o

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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 sid2/n xan3b qf81m3p leries with a 4.7-mF capacitor for a resonant frequen f 33b2mq /1anxdilp8ncy 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 navt 7lvk6;yl,7gqcum u8n 7+ieeded in series with a 3.7-mH inductor for a resonant frequency ;mtvykq7 l cn l 7ua7,igvu68+of 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 5p i5507xr(ter txbp6 ux v *.um/piliand a 40-mH coil if tmvtp5 b xl (i*0tr.6i/uu75xp5i x eprhe resonant frequency of the circuit is to be 1000 Hz?

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