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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: 游客未登录  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 uni95e6kwm;(;uvt) wg9aahh ohj;e i 1 ppts 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 aq1rx ++7v x8ofw/iaswo -x*k states 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 produces what kind of change uvcja1pot0z/ipgo2r w 7 6+i +on the indo/aw+ic 2vu6t zgj0 p71por+iuced $emf$, 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 loop of wire ppr4)s74wafy. kc 6:8f auzvf jroduces what kind of 786fyu4)ja f vw.kprz f:s4acchange 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 lol. 4/xrhomj*x op of wire produces what kind of change on the inducerm oj/x*xhl 4.d $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field an 59 (dsb 1wcxk1dtia6 q$emf$ 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 direct- /kdxv lgwf8)ion of an induced current in a conductor will be that which tends to prodd8wk/f)vgl x-uce 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 b yxhkuvx65a 95 vs5i7xar magnet is held above its center with its north pole pointing down. The stationary magnet induces ivx56yhxk7 ux s 5v95a(when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held00ymdflg r6 xza8)fg1 above itsa6 1xl0 rd)ffg80ymzg center with its north 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 f1ru ijent m6- :xrbf1m :m6zg;ield vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what itm-z61r mgxb6 :u jm frin1e:;s the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level tabw7x. 3aoe.;nu cd 7u o.kil6jole top in a region where the magnetic field vector points aue73o 7 i.6jxuo.odnklw .c; 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 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 where5f 0ozb1 o/e2a16q kuxcq8tln the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current i8eoc zu /lxq651 2 fkt0o1anbqn 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-ingtj:aa*auo (.x 0 gs rfe,xf13creasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the inducerj ,0g1 fau:3.xe(ot*sfgx a ad 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 o )g8q+koa( klq-z4 lsp wg..ac9 u3elrf wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewedl43l k gqaa 9ec)s8z uo.(qkwrg.p- +l 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 angu-0my4,c, vnboqj xau*lar speed about an axis whose direction can be varied. In a region where a unifo,,0bvno *u y cx4mqaj-rm magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed6p s1in id:ysa b.8a3y jaeycy+aa(/. about an axis whose direction can be varied. In a region where a uniform magnetic field point:cy 3 +(y. syapns6a ja8/d1ba .ieyias 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.zmzlq69v ud -1
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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 anr2ykyglm gih, wt /q)ri(1 *k-i8zsn4 $emf$ 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 xp8 (jb11(3gdu 7oihz+n f laamagnetic 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 tv/8z/d0 cr ;gxjn htg+he east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the pote8n; v+ gj0xc gz/trhd/ntial 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 angre h.shnx(:2r ular 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 transforme9d7zm l z6dl*s

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The )vadwx+bl r1 bgmj:)-;tkw6p frequency of the:)pg6rv- blmjd1bw; x+aw k)t $emf$ 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 devi 9+ey n1r7lsegce used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device th+q mukx;x75r l/ bxsff.,5 cznat

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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 secopg h 5uomu-):hndary coil contains more loops than the primary coil thenh pu)mou5h-g: it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contaih q0 aesbmgs/q;/s5u* ns more loops than the secondary coil then it5muegq q ; /ass/0b*sh 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 pr)trn y 93/vma*bcx(dz 5quh ;ower input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant circuit, uf1yp 92urgh54 w(i)lloch( f

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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 t4 i81fmitmt;-/6k:e oki/nd uub.xjconstant terminal voltage. At the moment contact is made with the battery, the voltage across the resist61i8m4ku :ifk.jmo/tui; tnxe db/- tor 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 a +9gd gwh: ;g9agwbr.en ideal battery of constant terminal voltage. At the moment contact is made wi ggr+ gh;9ww:g.ae9dbth 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 connected2tig9o- mi j2 oa4s/sf4lje,(gndm * q 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 i uk r/li7e5dl -s)e7lqnductance 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 connwnrqs5x) i*om.-ph ,iected in series to a battery. The time constant for the circuit represents the time required for n- ris* .h,pqo5wmi)xthe 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 i7;n u -7nk lg rl(m/fffre+(ito a battery. The battery is suddenly removed from / 7k nu-fgf(ifnr;me+7illr ( the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following havei 4r)y87xrqg ufci,c1 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 circuit, the current,ub zbtq;h9 bk hxn-2(

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, thozhua1t0/x 6 q wd4e f7nr2w+osqi-i2e currenr-q 2w+w6 iq io14d exz h0atsufno/27t

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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 circui xse2 )codi;t7t changes by what factor when the frequency is triple ti2;edco7 )sxd?

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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, th +ckkchvgj(; uqxvpl4m/6n62 e inductive reactance ofm 2+kvpcj 4hlvkcn ugq/66; (x that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approact7 b+/duicqe0 hes zero, the inductive reactance of tht+0 i d/b7eqcuat 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 su rnhm; xem9+a0(ocghoxjzj 86p4t:3l pply. In this circuit, the current9x 8c p3;o tho(0ehlx:nmz 4+6gj rmja

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactancew, x( 9r,gcwvv in an ac circuit changes by what factor when the frequency is tripledxg,vc,rw 9v w(?

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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 mgj)ii 58z )yim6fsm7capacitor approaches zero, the capacitive reactance of that capamfy ijzm5)s igm)68i7citor

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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 bel-so2i6 s4 dull o;bl9tween the voltages of the inductor and capacitor in a RLC seoidoll64l;bu2s9- slries 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 au3r:uk u5g(v wn RLC circuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increas vl f95enta:;res if R increases. When is thi9e :ln;f5t vars 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 o77ej-c2:mt kp* sthu i )bv*yxf the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit l/(fgs :u,oli 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 series circui rpz +ps); /hrfn2x.5a oi7mezt, the resonant frequency of that cirrs rahmi2n )e.fz+p z7 /x5p;ocuit 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 tha(d ccj *uk.h 1tajzg*/uxgsd 1hu5c8sj.-9 nst 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 RLChvrnml5n7jy6blh 71:rzrt t b78mq( ) circuit 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 rotatinehew.b n- p(33smanxbn 4g*y*g in a uniform magnetic field of 0.20 T. Find the magnetic flux thr s*m3eang .*bxhn ew (43yp-nbough 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 0.1s -th1 q5quhb*)ile(0 q)mpjs0,sgz l 0 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux throhtqes)z*mbg)5 l s0qp(sih0,q 1lu-j 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 rotal+xzd- lib5;u i yq47wting in a uniform magnetic field of 0.20 5ulbqzyl+ii xw7; 4-dT. Find the magnetic flux through 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 single loop isvg 0 a3p29fln+k5 mp:a9o oknb 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 coiix0 ki. 3sfomqv71e1oyn-x b(l changes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a x 9h i3o-i9s89gbsk ojsquare frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s,gs xi-98 j9 o9boksih3 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 jgyw;m*vhps15v0 i y*-,bf7sg fhy g4area 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 arww mt +o/* u1qzm06n - nmbkhah4jtg(3ea $0.20 \; m^{2}$ 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 lorbqh5t7s., .w 4dtu zbcation where the downward component of the Earth's magnqt..h7d 4rtz,bbuw s 5etic 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 2c./cg pguojp mhku) y35h0q3m*(8h fn:.jipk .0 m long rotates at a constant angular velocity of 2.0 rad/s about a uogh. (cp/qh3pmmhy8u0pci )j :*fkk .5n j3 gvertical 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 as1cd x38a2m77b zj3 zsg rk9mg 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.32jy ouhtk9v 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 rectan3q8 2qn-xg)jy .sea gn -zdp5ugular loops on its armature. Each loop is 12 cm long andg)qs edqp-au5n-nxj3z8y2.g 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 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 iae 4y0 rc)ax6j;,i bl100 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 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 co+ hd:qbqva g.khu49yr -/j;tynstruct 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 area of the rotatin vh4k:gyd j+aub-;qrht/.q9yg 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 with * q zhk/e8grk6l3 lj3xihgz4(q zcm62 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 resisvw /jxixee m52 ,ki v/ed8jxikaq20 ,4tance 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 resist 4 nl pimv /kp/v0wyc9w)a-7myance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generatkw4 my/ymw/ci9p0pv) lv na7 -es 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 conn4t g1psg1 g5rpected to a 24-V power supply. The operating current is 1.0 A. What is the stag1g5 tp1prg4srt-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 supply. - (qs-q ilkab( The opqi--ab s(klq(erating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected t c .vk-sptmp l7h,c+2to a 24-V power supply. The operating current is 1.0 A at ful2kl ,ppmvc .-st7hc+tl 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 voa7fqjmxwc o*uh9:)etazf 1yk(m ,n1)rp 1e .rltage 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 qm-:yb l ;ld-r1 2xmshin the secondary. How many turns :l hb 2xdsr ym1l-;m-qare 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 tum4w wrzv2,wonrukg8 h6*r s 9;rns are necessary in a 110-V primary if the 24-V seconwr, wgmr*629zw4ho 8un sv rk;dary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and juv/la3 *usoiq 7 rx3,a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is7ousv3l, u x 3i/ajq*r 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 cq -g0zw0gh 6fin the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondargq w hczf0-g06y?

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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 tc)p n ia9a+aj*o,3yxdransformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. Whada+ *ji9n)aop, 3ycxa t does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil rlg 2ot-;gysy3on. z)and 300 turns on its secondary coil. If 120 V at 2.0z)o; ylo .grg -yns23t 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 on its mj hoyo*wbu c q88n:vxs:d:j78ixo +1secondary coil. If 120 V at 2.0 A is applied v 7 y8::o*insjomu:8x+jxhc1w8 boq dto 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 tub0 *h;*m ,bmc vk:cuxqrns. If the input current at the primary is 100 A, we can expect the output c vuhk;xb0c: *,c *bmqmurrent 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 20 rtv5cvu:,8g )edgb-x0 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary td8ub,rvgc :)5ev gx- to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 2-/4vias7 k 2 dlhpiaeda ,qqe.k,0fj -00 turns. If the power input to the primarys0q dl-fva,ak .i7q-ia jh deep 2,k4/ 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 am eyd-+;u .px lbtt,j;t 120 V. The voltage is usually stepped up to 4500 V byjm,ty-e;xu. l;+d bpt 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 has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually step 6vlp,:g nfc zb6o7h/wped up to 4500 V by a transformer and transmitted through p 66fn v7/,g:hwbczol 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 ttr,;d9n/(j2f2pyxx rbi/ n jcurrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentbfr,;r2xjxyi p(tnj/ d2t 9/ nage 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 50 km long has a total resisezbo-qj i57po x76ha6 tance of 0.60 W. A generator produces 100 V at 70 job 66xh 5ezp7ia -7qoA. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy 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 transmission5 5/n+tv9yolod d. unu line 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 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 loston5/lvuydn uo +5td9. 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 up-8wuj6b cf* at 1000 V. How much less power would be lost if the power were transmitted at 3000 V inupwufc6*j-8 b stead 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 ( i:npma:gmfyt 1djv.l9k.5l1 qhnefp zk+ (4 is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if5m.ftp1hndy1:lnf(i9.m4 veka : zpgjk q +( l 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 ene tmb:0hr:sfus h)n:6 ergy is stored in the coil's magnet)e :uhs6 :thrm0: fnbsic 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 r:w ks6irzl0g-dw8tv- esistor and an 18-H inductor. What is this c-wt wi8g: rsz -6dl0kvircuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltagelny7o, qhz;4 i is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peakitcjk6e4i*j gv ) *iitp6i(,m 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 5jg-7k okpciq5tpk 2. into a 120-V AC outlet. What is the resistance of the lamp?t 2k-ki 5j57kpqc pog.

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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 power supply. What is tx fo7ecg d ftgrp((86v4 nwb,3he peak current through thw3bpn c6e8,xg o(vd4f(tg7rfe resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V a ;prfz 9vo u0etf9s++zc power supply. What is the power dissipated in sr+u0vzzp9f t+o ;9f ethe 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 ktrs eg. y-aso8u77p8 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 50-W resistor is e)01y; l d6roqz,i5pkjme0 me $I = 0.80 \sin (240 t)$. 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 rejw -lht .4y)8ox7 bjtdsistor 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 inductor at ,;9 6fuv5*zb-p: t0(ikgursr pigbne.hzt8 e 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 reac9xwu4 y/6)0w zzkfj yctance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency wi(q .yvqkkfw 0v0-) wjmll a 14.0-mH coil have 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 ois.b- 7(-bs0 upjp. hdccs/waf 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 20 kH6+qg4b :sw +vuuf/fhf z is applied to f:uv+s g6bf +hwuq4f/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 througo mw);up rxmkp ),/q ej;ht*4kh 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*ss;-a.ig h 8q6b) qbvvlz ot1.7-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 capacitive read 8 bi3qyta(6lctance 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 reactanou g-8d b,jm0ace 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 capacib2nlbl2cs i2; -bszq* tive reactance of a 0.010-mF capacitor be 100 W? -lq;b2s22b csb*nzl i

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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 0.0, :nb-,cxt pk) vxxfx1010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0e4/ct 1obpdujz 7c4djbrw+ 1a mc),y * W inductive reactance, a+j/ y)*1bc mu 4bj7 4pe1,rwaod ctcdznd 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 coiv8o mqr)n.sqkx/5do c )f1ri*l, and 1.0-mF capacito*qcnoxq is)o)rfk./ d 1mr5v8r 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 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-/dsv avh6l lw lq1d6i2:d61 ttkg5yb:mF capacitor are connected in serivvlwtd:b5ydgtlkh2/6s 1a1:6 ql i6des?

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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 i r;lvuu:o:x(gyd4cq rlk 31c- s connected in series with a 20-mH inductor, what is the impedance at uckqrd g(:ll 3oyv;r :xu 14c-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 20z)r3/g yv5 lc+mva u1oqfsd0,-mH inductor, what is the phase ang3r o/vayqucvz)+ s5l0 1d,f mgle 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 i;2rku7tf g63hzbg em 0n a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impeda 7mhr3kb geg2;z06u tfnce 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 wital).;bnb i8py7ef yt n x8-tpslhf8:7h a 100-W resistor and 1e. 7tlt 8yn8ab 8pypl)x:7fbsf-;ihn5-mH 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 l/gh(7pse2 mqj;1oj kin series with a 450-mH inductor at 5000 Hz for a total impedance of 40000 W?(g2 ejq1hm/koj;spl7

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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,b)a q4 3v6 n) k,pngtdzmg*ng series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kbdg4n) ,q36gm t,v kn)* pnzagW?

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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 is 4k o(79joz u/fz f4sux:e7a mgthe impedance at (ju 7o4oufm:es 97z4xafgk/z1000 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 with a 10-mF capacitor at 1.0 kHz for r.-)tgzj-m hla total impe.l- j)g tmhzr-dance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a phascno(-8b8( xeujirg3 wbi:f p 60dg-zoe angw-gu zp6r-bd:nxcf(ge i j o0o8b 8(3ile 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)zjxe *(wh:fy6 jl6kz series with a 30-W resistor at 1.0 kHz for a total impedanckzj:j* 6f6z ) (hylewxe 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 sericx,b w, im w:t)wyz8 v5-wcnc7es with a 100-mF capacitor at 120 Hz. What is the phase abv:,w, nz58 ymc t-cw) xci7wwngle?

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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 ani qs (8y73hd2yczp +/7hsy wjmd 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capaciyh cs8(/7s+dymw2z j 3qhp7yi tor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capaciku.qoftp9 49n tor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is.kt9p onf94 qu 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 rey7 lv+n- lsr5fbxe4yww1 /p (hactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in th/pwwle1 7 4r-xhvy(5ln fs+y bis 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 eyac)3m xm nm3kfq*qjbw9: w9po: 0 p5a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, cbw *e x5: 9mnqok3m9p)0j mp:a qywf3and 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 necessary in series wiofpk)ia.0( x*/ an6m* y seuxwth a 500-W resistor for a phase angle o 6 *.xoxi0)a*n uykf(smeaw /pf $40^{\circ}$ 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 frequenzz d/ddgr tdmr8c0q5/ oq+5u ;cy should the circuit be driven in order to have maximum pow5c0+/qztmg5 r rdd oz;/uqd 8der transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistancey 3; hj n2ndz7l*y:rp1mrst8x, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when th7sj z*pr 1myldtx;y82n :rh3ne circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an 6 /y+b 3qp7ya +xdwmgbAC 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 rem gr)z4w(te p*ov b4b79zuwto1 7j5qpsistance of 30 W. What is the p)4otqbojp r(t*z771bgmu9w4ezwp 5v ower 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 58vmy4neko (o+ yz (ql*0-W resistor, a 10-mF canoy 8zk*oy4q((m vle+pacitor, and a 0.45-H inductor, 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 coil in series?j65ul h8tapsy3; mss 8y8 6psuja 83 s;5lstmh

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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 wr .fjw ws3(u2mith a 4.7-mF capacitor for a resonant frequency of 10 k(.wwrm s3u2fjHz?

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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 ined 9yy 7bdy6df*p,f8e series with a 3.7-mH inductor for a resonant frequency of 1000 pfydf6 98ee,bdy*7y dHz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor zssts:;k* e* jmust be placed in series with a 30-W resistor and a 40-mH coil if the resonant fr*szj*s;s :tek equency of the circuit is to be 1000 Hz?

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