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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 :dwrfo1 erd7tt -4ic :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 2d9ge+qa4y g vstates that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil producem1/z1 urtu n5ts what kind of change on the inducez15 tm1nr/tuu d $emf$, 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 ma3y8 r p c2d +t8t+4.)juorkfy 7tuqbvtgnetic field through a loop of wire produces what ki 82qk)pfuv.+u8b trtdory +4c7t ytj3 nd 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 brgdxh0p. u/s7i vk91produces what kind of change on the induced1k.7 bupdis v/9rx0h g $emf$, 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 m+e :/qvbdvb- 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, qrs8wmxqjl ) (ug:7*bo4y c y8the direction of an induced current in a conductor wills8o*xug4 lbj7 q(r:)qy8ymcw be that which tends 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 m;65 zbvsaf4k/bkq)oy.l jq0 flat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stat y)sk5. b0m klbazj/vq;oq6f4ionary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal tabwp7ajn3 ts7n/le. A bar magnet is held above its center with its n 73sn7nap t/jworth 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 the magnetic field vectorp 2vj-z y6uu.j8znyc: sic(/e points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current i u2:p z/( niyeuc.z cvs-6jj8yn 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 magneti xe+)tj o2( iv/mohy*frcgc(-c 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 as the field increasho+j(tg*vf i(oe/c-cx) ym 2res?

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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 whvpvvnx w1zo q3rpju4 07s .w4p;2g4acere the magnetic field points straight down. The mas3gw .oz ;crvxaq 2pjp7n 1u4pv0v 44wgnetic 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-increasing c x als 9 )lao8tedh20:fv+ c)xzxnd68hurrent northward. Two coils of wire lie flat on the table, one on either side of the t)+dx80v llda6:2)hhs zoxf9 a8ne xc 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 thjr dm+ .f( pm)q:6yicrrough a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from abomp+jcf6 ir:m y.(qdr)ve)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis who7 ,tc fb5z1+etjejd jx,9/ol rse direction can be varied. In a region where a uniform magnetic field points straight down, what mustrl5 z+ ,b ct/ejjd xj91fe,to7 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 an- e jjze3+ mg2f9nr;mxis 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 anengj9+m r3- efz2j ;mxis 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. q qr3upk67*rj
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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 thattlusc*:3qisx4 ntewn. 2y(h : 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 fieldv8syfzlytf;kh852n u20e4 el. 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 (orie w0 snwzi /w/(c:eeh9bnted in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a stahwci/n:bez/e 90 w ws(tement 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 constanwqay+) n6 8+yhsf0k7ma(prt vt 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 transf:,e*hiy38 vxr r;qrez orms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each secotjh 8:i 5hmvv1nd. The frequency of the :5v8i1 thhmvj$emf$ 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 * lvq*i wgie slbz3j f4qb 51-yrm,(a:qbpq+5sed 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 devicexexnfj9qx .)9k(x :j g4ihsg) that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the ,jdyphd1rss 7f+1em( primary coil then it is ajsp11y d ,+rsef( mh7d

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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 contains more loops than the secondary caudvu0 2jt heixj3 eh.wk92b 9dp8;8ooiox;a e ujt92ibvdu hde 9w0p2j 3k8.8hl then it is a

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, the power inputc1af)*y( e x y)un;pml lm8j9b

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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 resona07osq0+rfc1l em.rwl7nfg 0rnt 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 vv (xmwrn5vbc*w;7 txf/ mj2n *g.oz2ideal battery of constant ;g 7 ojrw/zxnt 2vc bm2*v. 5wmvnx*(fterminal 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 ahl-i(s r l3c.gn ideal battery of constant terminal voltage. At the moment contact is made with the battery, the v 3rg-l.is( lhcoltage 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 andmhyts q)3z; n/ 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 and resistance R is connected to an;cb: )u 2 e3u5ofgt nh/uiy3qzxq(h.i $emf$. 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 conne:qie+/q gb0cx cted in series to a battery. The time constant for the circuit represents the timeiex/ c+qq:g 0b 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. The b 9j8+;sqczhg+ z gg:umattery is suddenly removed from the circuit. The time constant for of the circuit represenm +uj8zq+ s :ggczgh;9ts 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 haveh(njzwi. 0d5 qr/ w7m)+gd hme the 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 cir- wq87h gq9;of3yhnz(vms( 4df4 srylcuit, 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 tozmi8b dfc:1o h0g uh;mfs+x 6; an AC power supply. In this circuit, the currentf zcg hmf+u s;01idx b8m6;h:o

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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 c5:j;z b-5rkko dcza.what factor when the frequency is triplc5:zb.5kc ;-dz rk oajed?

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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 indulz wd/kv2, zdlhu)qrb(i9o 7;ctive reactance of that ioz7bl( u,lwzdq;29) krh /ivdnductor

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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 approe8srnh24o5ftt / z d;waches zero, the inductive reactance ;fnszw2 o5/e84 rhdtt 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 supply. In t2 9gmmm/eg 3fo9e4twhhis circuit, the current 3/gghem49 t fw9emm2o

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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 fp zqi 3si5yae ,klb+;8requency is z5kib y 3;,le+spaiq8 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 voltagdus y*b 5dp(/ge across a capacitor approaches zero, the capacitive reactance of thy db/*ud5(pgsat 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 t.qf*o-wmqhsx )i l)l)d hu(; inductor and capacitor in a RLC series circu(*hhwm;il tu sqfod.l)) )qx -it?

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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 cir 2m0aojcogc3+cuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance ob70x v/timqlj+;r2l s f the circuit increases if R increases. When is this statement true?stl2q7b+mjx;/ 0r lvi

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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 impeda8+ .wlk*5vl nzcxfojf(c mk1/j2 jy1 pnce 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 thp-;pehsd9 )q:c8 9 ompesdxy9k .9cq ze 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*b/915mymk ye.xxex y4;swt aes circuit, the resonant ftx.y/xwy 51k y* ase;4 m9mbxerequency 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 thaoiurr3v)j*xnc q xcpw/ l31-po.1+ qmt is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC cirj0p00v9kp: p)b dzscugvy5 ,x cuit 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 rotata/ 6buda 61w no*yayk:ing in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and ta aky 6n1daw:u*6/oy bhe 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- 0wxq00gp;yj*s:2hw xc wa bv a uniform magnetic field of 0.20 T. Find the magnetic flux throbhw:scyg;p x0qx2 00*w vjwa- ugh 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 rotating in a uniform mbj8.e 9otuc(qxfg9 l,agnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the lo8o tl,qfxgj9ue b.c (9op 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 sinrb0l wuio)/9p1tnp1 zgle 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 changesr -ybpd f+/d(dvp2 ni :7* ksi*2szeld 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 turns of wire on a.p ykra j3)9mf square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the fieldj9k.fp3may) r 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 )pu p+l 13pek bh-8 :rw1zdwqc1a(ehaand 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 area k/rzo :5wlsod9 ;2eaa $0.20 \; m^{2}$ 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 locationr jg5w pa1(7ox where the downward component ofa(op7wgx5 1 rj 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 that49bacl+/ah i+u -up8wamdd z( is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fielazum +ua8d h capw 4-(/i+9ldbd 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 generatwyizmok9q;4 ,q0n;fh012)ih t me4wt dako t/or has 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire o6dhv/fpeudg1 ;5sk )y f 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 armat0qx hzn,*68 97 qqihujhmdxe9ure. 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 axishih h6d 7qx* mju99qnqez08,x 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:/nyu. fq8 rjm 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 t,wp70 kb qf7 ;siyj:zro construct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T i;: yp 7w0sr7 fiqkb,jzs 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 generator h+vxcbps+7 /4uft vo* with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of1ar-f ly3d) jp +xhp3q 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 x vpmz1zd j,)v1t cc(9resistance of 6.00 W. The motor operates on 120 V AC, and when ,9(zzxtv 11vccp)d j mrunning 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 rtai 2k2ka/+czesistance 6.0 W is connected to a 24-V power supply. The operatin2a2z kcat/i k+g current is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power sup)):nhap6 qr*py ; 0sxn :ubpcpply. The operating current is 1.0 A at full speed. ;pha6cub )rp: py*nn)qp0:s xWhat 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-V power supply. -uo9 bceq..stThe operating current is 1 -qt9c. ube.so.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to 4spm h (aybo2)qgiw7 2reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14k.wq/sezq6hp47f, yw A to flow in the secondary. How many turns are in th y,w/6wfqep4z .sq7khe secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary if the 24-V se1hztx97 b+ u2kb. pxi5i oi*lpcondapix 9 h*t1ik .5bzpi+ bxolu27ry 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-tur 8tm- )yxtdrbu-u6kfpl6( 6qn , mhd4qn primary coil and a 2000-turn secondary coil. If the current in tqu,r q(6n)hdpy-4 dmtmbkl6 8 u-xf6t he 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 5few p-llq1f+ in the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow +-w1eql 5fplf 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 7500 V at 10.0 mAh +mnv +kuv3e6(vzdi)+ atjoa2 f/ tl:. The primary coil operates on 1 tknov a+v(:l+3 tz2+ vd)6i/jfheua m20 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 turn;/fv(jvlm6 d es 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 secondaryv(/6vl e;fdmj ?

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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 kd+*wi tfsau5f*me81 300 turns on its secondarfw5dk8 mae+if ts* *1uy coil. If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turnez y;4my6 z:z744yr0i4 -5sufw4 wxwsezqqom s. If the input current at the zrqzwe4:u4mx4-mi 47fqssz04 zy;5yw y6oewprimary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. I v+k8g:9,xlihn(fp k mf the input voltage to the prima(k lvhip8k n: ,9mfx+gry is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a tra v*4e0qha2 kuunsformer has 100 turns and its secondary has 200 turns. If the power inpvh4e u2*u 0qakut 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 12j ;r/y7dxecs 20 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 secondary if the primy ;7jdxsr2ce/ary 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 y2ci-3wrrqfhh4 5vn/ 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through ahrcrn4v5h 2 f3 wyq/-i 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 120 t-7f/.9 p0dejm; i *wzvihpuwV. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power ltzieu; 0d -9 7pi/wmv hf*.pjwine 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 line 5s3.qd0ikn/zhe o oz 0y4gnx0p,mb , +y0 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In ordery 0ki3h0o.p+4g xeqo dyszmn0z,b,n / 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 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 lo8t cpm2a5lps3 z63zie c (/ss2obc f3rng has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heatinlb2ccs3 s s5 pa8t c( 3zr/6epi32mfozg 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 64qyqwj4 /nsn 9-W line at 1000 V. How much less power would be lost if the power wynw4 qjs49 nq/ere transmitted 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 20t(cb b)(mw rmf8onc j/iy:-cmj c/49j A. It is to be transmitted on a line with resistance of 0.60 W. To what volty()/8oc:m /jb(f i-rmbm c4j9cnj wc tage 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 curren p -l k09+kydy9t0lsggt of 5.0 A. How much energy is stored in the coil's matlly g00p d sk99k+-yggnetic 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 kyj. 0cbr,-xl47mz yy7*nic p++lozf-H inductor. What is this circuit's t-pxir7l y z. y j+cm4k,f+*07o znclbyime 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 volt *r m(9+zmoz1pwge -. wcargg2age 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 1296fc psc744z/ /anhfszw q6yp0-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 outletwnrh zl :unz.-xa j86.. What is the resistance of the lamw6azn 8. xzn .:-ruhjlp?

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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 12) sia ep;o +mw-v4.gnn+eh qb/0-V ac power supply. What is the peak current through the resistev-qn;m)gwo+.i n sbhap+ e4/ or?

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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 sup,f e +-m xr;7xgcb*hgpply. What is the power dissipated in themp f+ re*x,7g-b;ghx c resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 5h sehlylq1- te2-k8l :3p4 ldq0-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 50-3gkc2xzw,tf d8 w 34buW 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 resist3b7 kk0 yvk0)gl,i pucor 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 indi;ad3 ,6e,od5a,lphq txff5 fuctor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at 10saqhg2z*z 1 yur:6woyv1f j vmz7 uf5.:.zp 5r00 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 l(s xr1nt(7diinductive 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 1apulhjw *(e )jqr ,t.9 bi*xf*57 W of 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 17vkpa7hor/j;87 v a *nb) tbmg20 V AC at a frequency of 20 kHz is applied to i v b*;)atbp gaj8hkm /v7n7r7ot?

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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.zmn8d24prk6 g 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 react 0f.mv*uhgj8:j vh4mnance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitivegxlr30(mks6i y +zhj jd*t4 x; 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 10-2.f yi 40cdxnqmF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor5q iu/3iz6zy 3 hf4xhd be 100 W?3f6z hi x3q/u z5di4yh

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz9 v:d pvul tla7a3)wf j37ol*xm th5f- 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 ci r*eqcsvq o50.rcuit with 12.0 W resistance, 15.0 W inductive reactance, and qr5esoc*vq0. 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 1500sa c8aq n ;pw8(ym8e5o Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are (;o5yqn8s c a8m8e awpconnected 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 Hz if a 100-W resistor, 20-mH co:f,j:-k l ryn.o 9jrdxuc(j*wil, and 1.0-mF capcfu( n ,j*rk:-rlj9wojx dy .:acitor 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 cos2 ./h yexd3v af+e)brocn mn 4(j-y*vnnected in series with a 20-mH inductor, what is the impedance ayondj+ vcs3y n xe bfe.am(v4)* 2r-h/t 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, whatoeo+ h+cf2h ob .enqa7o.l+i6dm 2r*x is the phase angle a*lea . h.hdmo7+b6q2coxonerof +2+ it 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 (w ta2dz-d- z1 l 1mcmvk -n*-0swinsfwith a 20-mH coil and 1.0-mF capacitor for a total imped1mzz*t ss 2- nlv w0d-cnw--i1k( adfmance 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 serie0h 81nee wke(c) pi/tcs with a 100-W resistor and 15-mHk1cwec (0eeih8 /p)tn coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH ia3)os .wv4izbk4j; v cnductor at 5000 Hz for a to;cbia zo. vk34 wsv4)jtal impedance 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,kdcx 954rl sth+k7nkgi .fj;zpr ,5v 1.0-MHz for a total impedance of 15rvl+ x ;z ksf ,jcki.pt4ng95 r,dk5h70 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 s q19(yz uoyhm aw73ib4eries with a 20-mF capacitor. What is the impedanceba9mh oy 4wzy1 7qi3u( 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 w ano*.mrb2zl6 ith a 10-mF capacitor at 1.0 kHz for a total n bo*a62l.mzr impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacmm1,u2kxzm- ;e noek +itor at 1.0 kHz for a phase ang -k12zm;x kue mon+me,le 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 resk (b,3a3n3trb3vordf: /kgisistor at 1.0 kHz for a total impedance of 45 W3g,to3a :n3rk/dsrvbbkif (3 ?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacitor / u az h:80zkb,suanf7at 120 Hz. What is the phasez8n b0 ,fa s7hzuuka:/ angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if avjb0 .6g u6bo+:lkv eo 100-W resistor, 20-mH coil, and 1.0-mgb6lj6v u+evo ko. 0:bF 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 re3t(ulp9 iprf; sistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rmrpit; lu39p(f s 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 j2w3w;d ciz tbni(45pcapacitor of capacitive reactance 30 W, and an inductor of inductive reactance i5nw (i; jbpwd2cz43t 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 cvl ae(2q7p99hgq-us y ircuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H iq9qy7g9l s aveu -(h2pnductor, 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 scx-aejvwc o z9 3m cuuij0nqh0 26v+07eries with a 500-W resistor for a phase angle of 20c0 e0zo-9wvc73 + qmuvx j6 jauhcin$40^{\circ}$ 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 m/;g8(xzw 2u tv7;ndg6 0c7tujzmuptbF. At what frequency should the circuit be dri mvu7p2t;/b wjuzg tx0;u7(nz6 8c dtgven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with yrpxkb n) z;/otqgq6d7l u+* oov8*9 a12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 12 lq*kndbt ;g+7uozv 8po x*/9qor)y6a0-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 circuirfac,b ;tu md,:*v3skt 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 W. 9; ci6-ezutd . wbkl*c What is the power factor?zcc;dbie-9*6 k ut.lw

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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+4 0 km.wc t7veele5wz a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when conne lzet5kcwm wvee.0+ 74cted 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 15lz4/peqk;;- ot aqir*0qly y,-mH coil in series?0q;e;l*a4zklpritqy y ,-oq /

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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 nkqkc4g- 1*v7h w /vuain series with a 4.7-mF capacitor for a resonant frequency of 10 kg a 7n4u1qvkh- wvk*/cHz?

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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 index +3cj8gchv- kdd -7yt,v3-pbjo( rt uctor for a resonant frequency of 1000 Hd kvd, - tgevb7-jo3 j8r(-3 xctpchy+z?

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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-mHmyuqowm/uy)y5q 4pedn9- *1vgm 2 *ku coil if the resonant frequye-45uyw/uk 2m)y 1q* qovmp*d gn9muency of the circuit is to be 1000 Hz?

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