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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic aw b;pw:z*qkt5kt61 nflux 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 3hr:e(q 2yx jpthat 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 x haz xqo963mr3imi+81 uy;t cin a coil produces what kind of change on the ihco r3q z xx319;ayit+68 muimnduced $emf$, 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 fiel)reeb9b lcetf.y()z) d through a loop of wire produces whatcye ebtz9bf()elr) ). kind 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 chang ( v2ag+*mxdcke on the inducedmx(v*ak g2d+c $emf$, 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 an5+ vczeytcrgu7klwkxfdd 3c;6v3.,. $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a condu-,ctm1( kccqheqb;. v ctor will be that which tends to produce which of the followingvt. q1k-eqmbc;, cc( h 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 liesec2j62lxp2r (dlt : rs flat on a horizontal table. A bar magnet is held above its center with its nortrd(:x 2s ljr2le6ct 2ph 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 flat on a horizontal table. A bar magnet ishda /3m1 y-iep held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed mi1 peh/-d3yafrom 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 wheeelru. w2ui9 :re the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the ieu :lewr9 .i2unduced 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 wm;+;ez*jc d yhcr73km here the magnetic field vector po;mzcjkrch;*y3 ed 7 m+ints 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 where the magnetic fiem-wmf 5w6 ksh rh d82mf82udruxk)u04ld points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in)kwkf5 f2-smd4 6m 2uuwr 0d8um8rxhh 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 evju o5-t2( .+ i8fdfv vilpw8rmer-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced cutodv ii2 5u-w8 frpfljv8. m(+rrent 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 north pole entering first. ( 1ulukd )ad(wAs the north pole ent ((aw1)kuul dders 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 rotated at constant anguhfft 3o ,;g8mxlar speed about an axis whose directionm38x;, ot gffh 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 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 wireni/gy ubu19wpg q2br2cw -b47 is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetguq / cugb12y2i9w7w-r pn4bbic 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.hh,01ytw4 qej oz o+4gs ,cw,z
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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 tl7x6 pjx oq+1+a9vbdox(ql 8ciea- 4y hat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field. Tfr0fl1fttf,; b7c85cbi ol sb20 3 narhe $emf$ 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 northward m 13zlwf8i p4u*2ifpdk;cx ; sat constant velocpds1lf;ifk*cx3i8m;zp 42 w uity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar8mjbmzt1p + :or)rtn+ 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 transforms; zd0e9v+ytra

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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 thrc s8( ob,kvgu ,l3r8lfv,mbt,ough 60 revolutions each second. The frequency of the (vv tcflbl8br,,og ,3 k8ms,u $emf$ 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 o4nt0owq5n e v8b)ec7ce 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 devicec6sm: + -c.dfi 0v9dix 5tg5cmw+bnlb 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 tha v*uxv.qc0d jg;hve ;.9 sj vo0tes54sn the primary coil tqvh d0u;gv*9et;0jsos vx.s4cjv. e 5hen 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 pria ps1 :roni,z)z ,b+fimary coil contains more loops than the secondary coil tiz)1a: pbos,zrfin , +hen 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 power2fcs78tuhbitxo v17 - q/q 4oc 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 circuiap8 o14tst lm o1bl*1fmpxf.h+2 zvw7t,

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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 arex5ff67nu; v 13a nlkke connected in series to an ideal battery of constant terminal voltage. At the moment contact i7an ;k61 evu3k5xfnfls 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 serieswan-r rrdl ;60 to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, twr-lr06a ndr;he 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 indrw/36ecm2owhxx; a 6d5c3h kmuctance 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 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 in vhwwe:j,8nxld o 3t o7/o24idljxtt - fl),u.ductance 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 ind2;:id6u )ceat nfcpe7uctor are connected in series to a battery. The time constant for the circuit represents the time required for the current to reacfep6i edc:2n t u;ca)7h

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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 c3y u,;t/snm7ct1vwae 9b 1abu onnected in series to a battery. The battery is suddenly removed from the c1, ua t/tabs1b7 cn9wuv;yem3ircuit. 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 ha /se+u/xxwc fu.l3a:1vq ie) h(jb .rrve 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 nj+ +zxbgznie; :o*-e power 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 supply. In this circuit, the curren( k+ya5jt b,j70zmww 1ipdux,5p z.d n5j ty50nwx 7bk, jpimzp dd,u(w.az+1t

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in2 m27ya,ft43(vd8r1 0i c ubqrlpoabv an ac circuit changes by what factor when the frequency is triple7 283lm(u0oaprbt2vad vc 1r fy qib4,d?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the i+s.t0kim/xeqo vv -m(nductive re0ve(sti o.km-xv+ m/qactance of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage acd*l8)p4g9 q03hh4a1c ifet a l 2eczcsross an inductor approaches zero, the inductive reactance ocfd30ae*s c l8 l9p )44zegi2aqt h1hcf 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 this circuit, t(e) v:vd lbyg li9j/8the current()eigjtbdl:v8 l/9v y

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactanceze bju-3owjo/w45;jy in an ac circuit changes by what factor when the frequency is tripled?ojj y z;ow5u4/jwb-e 3

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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 approehb,gl.fghh 9yjokl) 54 fgfl6f.s2: aches zero, the capacitive reactance of that capfoyfbh6h e l ,j g:g.kg)hf95l. f4sl2acitor

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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 vor6 m2x shw+*xy-u, lzn0lu o(xltages of the inductor and capacitor in a RLC seriesxm*s uy 2 +l6x,xw-oz(nu 0hrl 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-x-fj+b 9zfal;jltj9 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 dhhm)oe.ivd2 5g8+ t 0dic ok+impedance of the circuit increases if R increases. Whe +i)k2 +mo dcov0ght.5idd8ehn 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 circuit increases 2tu mg )gwj8b/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. Tiu,)r,;otqthn,b3 ivax we,dw 7;,ct h(btr;he impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series*p6xxzmsyo9 okt5a p*m8 g5yc/dw4e4; g3kw v circuit, the resonant frequency of that circcd9pwpx ykkm g58v5x wg;6z*som3 y4* aeot /4uit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At resonancbzw; l ce0 mp-gtz9v;e).)ttl e,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a serie,mfr ,1v n gl,rnupc+.s RLC 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 rotae ir*ti*-m4 0b4sdvjm ting in a uniform magnetic field of 0.20 T. Find th*4j0eii4rm*s md v -bte magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of)3 w2a vkskwvy490qe f 0.20 T. Find the magnetic flux through the loop when the plane of the 4keq20svww )f ka3v y9loop 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 .tcrs6i n7 8r.f q)ic a69cbdq v4v+ehrotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magds+b7 r.qiv 6 evfnic8 act 9r4qh).6cnetic 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 is3 ; vgnff yzw fenr3*xx516g4q 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 chanh * wxs 1- 7rbfdhw+1xk()kvy88 le yaju*in;ages 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 square frame with sides 18 cm. mjw; r 1x(; v9qt)exzgA 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, find the avv; z9)xqt gmjwe1 x;(rerage 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 1w 9 2rzvzy2(e,ff6nngr.pb+ m 5 turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns aj+(tytfry*h7ej:xe,)5 h ewond area $0.20 \; m^{2}$ 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 9uc pmw7so7d* j xpgg33ylk 3/at a location where the downward component of the Earth's magne *mj3lgcp7gyo9kdu3 sx/37wptic 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 bar2d8) nlmsz.*fuf1yo2 xdh zt+ that 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 co2ydnmt luz2)8d fs* .z+hxf1o nstant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross+hlwouj rbr2q7.2 o(fh jq).)gq ;rqs-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 ofntdi dt,jz02d h) e70a 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armcr15ur)3i/jvxgf2udbjbde. c s+ , + fature. 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 wilvb,b5 .e 2ccif)u1/judf3d gs+xjr + rl 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 consistf o6wlq :awlvg.;u846j1hopls of 100 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 construct a simple AC generator with an bge.)p *pmfvo.afd+0v q.x 8houtput of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area . 8v) g+ppfmbh0v .d xqeo*a.fof 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 wit eccsk acyeoqn8m5 n)9 (7(at2h 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 resistrpi;7 sqmfl h;oifb4j k7)3q/ance of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor8vh, m9o 1bh 2jlgv3je operates on 120 V AC, and w1ej,2v3 jbv hmgl98 hohen running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power ha9s j4t4 b2siyfg6u/ supply. The operating current is 1.0 A. What is the star4sb4t2h uyf asj6i /9gt-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 ltp:*67 vgy7.; zs- xmcqapp j 7for.dpower supply. The operati6qrstv jp ;mgdf7c7 o*ply-p :x..a7zng 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 b1n, czvquyu1k .- fd8W is connected to a 24-V power supply. The operating current is 1.0 A at f k81-y.fbcnq zdv1,uu ull 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 primadl 546xh/,d)gjwzqjdry 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 ovn .:n,z4pd811ks j, tgeukjtransformer causes 14 A to flow in the secondary. How many turns are in the s 4ko,n.e,j p1gdskut 81vjzn:econdary?

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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 primar4r u +punzxman7/yn s7o1o (y9y if the 24-V secondary has 100 a7(1y/ro nu7n ypmux4s oz+9nturns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secon hjfwkqmomf.) t :0csjwfm * -ha7 (,-b3f9gegdary coil. If the current in the secondary is 3.0) g7e:j fbs-,wthff0.- kw hogcmj3*fm (m9qa 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 in the primary of a transformer. A5nev8 m t/qn8assuming 100% efficiency, how many amps at 24 V can flo 88 m5aeqnv/ntw 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 transfi8m5+z0( nv r8g mf(ntybg:iw ormer provides 7500 V at 10.0 mA. The primary coil opertnm+irg5v zyfmw8 in (8 b(:g0ates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil ajjimi i i/ 5:kl(ic(++*ltaawnd 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltagejc m+kl/a5i(ii w:j*(i+ail t 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 mf mg;6/1oh*lctye j 1turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what h*jmo g1y 1c e/;tfl6mcurrent 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 turns. I4f+xnpgz0xlcdd /p4u a mw 3yr9xd7qif688n )f the input current at the primary is 100 A, we can expect the output current at the sxd8n9inlf+ gpf/wmu 8cq4d rda7 y)z064 3xxpecondary 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 g 5b u dygq7x,mvy f*w/;+c0brqmw)e(100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we c 5+x/wqq)0u;*w y, c7f mvb(rd ggmebyan 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 transformer has 100 turns and its secondary has 200 turns. If .*6aplwk0 :hayithr+ rz/-v;rz g0l ithe power input rk.;wialgh y+ zrilh - 0va6zp *0t:r/to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stwyrdrjm(w 6+o i7 /s2xepped 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 has 2 ys /7i2wx(w r6j+rmdo00 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 step4hl ye 654ne /ohazn9 (q,bzpg-l9 zvn x)/dmcped up to 4500 V by a transformer and transmit c -zn d4,y9e (4)n//om gx abzvl965hpelnhzqted 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 120 V.b);j-a/vbp:;mdw(x mz w yxg * 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 tr(w)m b;gzydbxm; j*a x:v/w-p ansmission 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 lineca fp3 hq ofl2cnz;wq48k8; u8 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 qah24fp;o8zc8f c8lkq; 3 nuwheating 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 transmissiondo 6:;ajbzwq/ 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:6bwz; j/a oqd 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 dow+6 x1byao a/, ggb;f+ytn ej0nn a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 100x,e 6bnaa1;ot0 +fg+ /njgby y0 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 44109 ays*o mipf0 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 wiy paof9si0 *m1th a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How mu6 sqla;x;88z amuf4k -d+d vooch energy is stored in the coil's magneticoqx audam ;+oks 8d-f 4lz;86v field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor. What is thih2y69ra* f *x-g;rcqovo 8yjy03mwhos circuit'9y;ojq hhy2r6owga0-y rxm * *cf3o8 vs 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 an3b)0: k*6oxlh it jkud AC circuit 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 into a 19,c ps/0qxs5bau 1b yt20-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 kmil;kh dlqs+*j8j9 ls*7pc* is the resistance of the lak9ll+*scqj 8lh7j * d*k;sim pmp?

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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 gw 4(50fzeu+hllup t 2is the peak current through 4z+le gl2u tw0h( uf5pthe 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 ac power supply.b m+uj(z+n8 pc What is the power dissipated in the r( zm+8+pcnjbuesistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resisb8v 6 ;d118zkge hc(au:pltmbtor 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 resiskv ks:j;my f52tor 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 0x/i)k znfd6ga 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mcevepu; 1zi 7 y2r1mla , ktt7/l*osb-H 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 inductivla renwre (h25 a)(u(u x.qro:e reactance of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of incgh0f o1qsi:o ih.lv8 a 3;l8qductive 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 inductivs6*-wcy 7fsf4 9rqhh0a g ;guve 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 2*fqn *uru4 oko*w1m f85tfl6 p0 kHz is apw8uotf*nou 65 *kl*f pfrq14mplied 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 coil due to a 110-V, a/58yus-wxe6b: dy4c g bdn3i60.0 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 f.rj*4it re0p reactance 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)/ 33lypf edlf needed to have 50 W of capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10- ;h) ljj;hen6qmF 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 ofn:5a dk:6w i; afbgof: a 0.010-mF capacitor be 100 Wf:kgi6;bw f na:d:o 5a?

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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 ca wtntf d:45zz72 b2-3ovkifp. bnev9apacitor 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 witv;3p/ pqxj1ix4zhi /rh 12.0 W resistance, 15.0 W inductive reactance, an h z/xxvp1r;43ji/qip d 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 resistoi(5a 3bva 5rzvtbk8y3q5z ps8r, 20-mH coil, and 1.0-mF capacitor are connected in se 5r 5ak3szqbb3y vtz(v85pa i8ries?

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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, fb*d6d7 tt )d44fbmvc 20-mH coil, and 1.0-mF capacitor are connected indvmbt d47*d f6fcb 4t) 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 induct8tq0:9iasqfix .o+ idor, what is the impedance ati09s+ xd8fq.q i:io at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mu+ yshu4wiq1khlv q((h 7)y 5cH inductor, what is the phase 417qkwuiyh+uhh vcsy (q)( 5 langle 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 tw fxyfyrjg5 :y- o9h;y b+)5q; tmkx;in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total oy 5q+ ;tyw jy;xgt) ;h9fx-f mky5rb:impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following 9jrfh-cx9k r;.nj j* *d9 zfplcapacitances is needed in series with a 100-W resistor and 15-mH co;9rp9- n j9h.rjkf *zcjxfld* il 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 inductor abu7 wkbnzja 9r29di*.t 5000 Hz for a total impn9 bzdi.ub7 kw*arj92 edance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHp/gc*oh 90hi-gugh( o z for a total impedance of 150 kg(h*gh9 ogc op- ih/0uW?

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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 capacd;:3k lu28l)eev7n +b oltbpuitor. What is the impedance at 1000 H3e +8 uoln:e2 )7vdbkbputl;lz?

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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 capacpg.4mckjm)+j 7p wsvd na:b.+itor at 1.0 kHz for a total imc 4mjgw:ks.7 +p. da)vp+jbn mpedance 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 1.0hp;qves h; +-n kHz for a phase a; shne-vh+p;q ngle 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-Wt8 7;+fo;p5tvrhp o7amu,r bddi y5b + resistor at 1.0 kHz for a total impedance of 5p5d yiuro7btboda ;8+rf,pvhm ;+t745 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 10s)bh10p99n ztyge b ,s0-mF capacitor at 120 Hz. What is the phasss)gn9p 1bt ,be0 zh9ye 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 a 100-W resistor, 20-mH coil, auqzr-qsrb :m5bpo. s a99t54pnd 1.0-mF capacitorqp.sa mq59sb:59r zptub4ro- 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 resis/1(nwqk--.ysh r g imptor, 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 rms current in the circui/q.p- h1 wmr (k-sygint?

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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 react gp+dh;iqwv2 /ance 30 W, and an inductor of inductive reactance 30 Wh/gp2; qw i+vd 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 circuit containin09;kwv5gt irm3yo t1 lbw--kd fh 8tb/g a 50-W resistor, a 10-mF capacitor, and a -thg5d; 8rm b3by9lv/ 0 tokw1-w fikt0.45-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 ser1kcpg,m-lg(qaj7 u 3c ies with a 500-W resistor for a phase angle of3 ( g1laqjc,gkcmup7- $40^{\circ}$ 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 sc3t ghsbg2,;cd( pm,, C = 10.0 mF. At what frequency should the circuid;s p ,g3cb2, gh(csmtt be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W .4zjkfh9ip1 f klq )odc64oh3resistance, 15.0 W inductive reactance, and 10.0 k9iof.6dh h1z4kop43 )fq cjl W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit isu:bmk 3*1nkrkcd +e5* /p fvxy $63^{\circ}$. 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 (mbvb xvth3p4;7 +hg 9 bpr:p,xlo,wsa resistance of 30 W. What is the pow(4pb s;o7hbvm93bg, xw,xv prh tl+:per 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 50ai4 /mt(k+jdwt, 9o*o 9gjqht-W resistor, a 10-mF capacitor, and a 0.4+m(*gk jdj9,at 4w/9ttoo qhi5-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 o t :*vlk.qh: -etui-gseries?qugt ev-:i oh- l*.t:k

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF ltue 03vx7 0flz42oadcapacitor for a resonant frequen ae0zto374lu v xd0f2lcy of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor ford7b) c-)f/akn z tdtp+ a resonant frequency of 1000pc fd)-tt)n zb /akd7+ 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 resistg:0r9 )hdz gcej+ d0bvz;5z4mxg yv) oor and a 40-mH coil if the resonant frzby;9gghg )) mv0ded0: o 5zxcrj+4vzequency of the circuit is to be 1000 Hz?

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