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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 : ts7bkvp83 u.p)acgmflux 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 induction8gv *+c.r aote 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 w3 nj7x0ny klw e8/vx.cire in a coil produces what kind of change on the inducedle/wn3j7 yn x.xc0kv8 $emf$, 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 i0sxs1)tljf3 of wire produces whatt1sli 3) s0fjx 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 31b6xbrzw6; gyj4m2 lm)pealof wire produces what kind of change on the induce rb;zpjbmml6w 6 a14)gl32exyd $emf$, 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 magnetik4tz*pl jvo ,op /;qsdt4/1xe 8arvo(c field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of au55cb o04yv xdv.07* rodsyt rn induced current in a conductor will be that which tends to produce which of the following eff cyyr5v5u* xod.0rd4vo7bs0t ects?

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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 onm8,om bl)e*d1 470qvtr k qkiz a horizontal table. A bar magnet is held above its center with its north pole pointing qor0ktivq ez 8blm1,47d*k m)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 is he/znhc.gcr sd7-*0 a bbgqc/. ald above its center with its north pole pointing down, and released. As it approaches the coil, the falling ma a /gccdqn0/ag bz*r h7b.sc.-gnet 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 qwp:v-/d +y0za i l s:nlk19/ylsrne;table top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fa/v y:/zni w1dlq k9plsr:y-ean+;sl0des?

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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 t(ca nyn56m-dpm; a+dr able top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field inn5ma m6pyrc+da;nd ( -creases?

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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 magn-mzacwhhw /80 etic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in twh0c z-ahw 8m/his 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-increasink-q,x6kz0)m*0hrw+ svc jbc( vwnks,g current northward. Two coils of wire lie flat on the table, onecsz wk-r0,v ,)+xj kq*nwms0vkc6 b(h on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop ;kguwh -.xo f7of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from .xw -7u;gfhokabove)

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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 roy5kts cw9u k,3xa/v )otated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation s9t3xk/5 vu ywcao ,k)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 35p5us; s68 azhyv3n+q a awtjspeed about an axis whose direction can be varied. In a region where a uniform magnet sj+t3;z8wa yavupq6 s535hanic 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.d8q rsjuo ,71s
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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 aiwi4)f,z/t y0lac)j e n $emf$ 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 px/z8f id42a,6a6 .lqvk0a8qcr nfrd field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction) is moved northwacepf7 *h6nt6 5yh9m mhrd at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across t m6h5n79myp*hfec 6h 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 com;s vcyd84m- lnstant 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 tra4 ukppq2wk 4v9nsforms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotate k3h8fl ns1o7ji7rk s3s through 60 revolutions each second. The frequency of t s8ko3nk77sr3hjilf 1he $emf$ 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 devicehosp wy9j4,hk6*uo 6s 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 devy90si8cov ftxcct: -v 0g m(e)jma):cice 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 thg,+7lyc0 avw 3buf: z;hka 3rae secondary coil contains more loops than the primary coil then it is a7var3w a;a zh3klg0:b f c+uy,

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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 s tp0vgs2 ;cc kr:g2g.5 usfak;econdary coil then it 52k0g;fsrska;gtp2 .g :v cc uis 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 poweg)p 1 53-fc, ziy*msaeqi2lxlms+v m, r 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 circvd*r1w ldm5x-uit,

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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 inp,ehh zu) c.b8on,l,dductor are connected in series to an ideal battery of constan ucho.e,ndz h,,)8lbpt terminal 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 incdv)+ qna, jw;ductor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inductj )q;v+wac, dnor 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 inductahuhjwob4v 0s)/2p ql /* h4zd irgir1.nce 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 inductance L and resistance R i-p ca4,ku4 nrqs connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The time con2-+ukn(ypb3pds8 yxz stxbp3pksy+ z(y u-n82 dant for the circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series v8 vi+dx jw+m)to a battery. The battery is suddenly removed from the xvdi8 j)m++vwcircuit. 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 have the sams/pgp4xs5jycxj 1q6 i5:gnf0 e 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, trb v:4de2b p k2qmt;xm/0:aythe 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 circuivb u4 0rpu1yx8xg1h1 jt, the current 4upx1 b0h81vyrugjx1

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by what factor when the freque*zb9kl+kjf1jkz 1k25hpoz8uljk4+ t ncy is tri2*f5zkktklz1l +ukz9j hko841j bp+ j pled?

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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,q8sj x ap*0 *omm7xk2y the inductive reactance o0pkxo7qmx y8* mja*2s f 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 approaches zero, the inducl;duv-h*2z xqu5ag,k;,v y ohj5/gm ltive reactance m5yu- ;gh,,lxuda jgv*lo hk5/zq2 ;vof 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, the currer9zst(caf 64 xm no0rbd) vja-/s+sr5civ 08l80v05/xbs rims )a9dnv(rzjlr s a4-+oftc 6cnt

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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 w rf qsa qxn0d (w6sy-ciz)r,k 2*/zil8hat factor when the frequency ic/6sf (r s ai2diwkr)yq lxz,08n- zq*s tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a cato/*ue 3 n)3 +9whqy:ii wnmstpacitor approaches zero, the capacitive reactance of t hqsm iwwon */t+eu)n9yi3 t3:hat 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 theh*v* ;i. u5pzv:uoz ri inductor and capacitor in a RLC series circuiti5pz u. z* vh;rov:*iu?

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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 circug,, j-bmd2 5k )kl vx v:r2tqrfb9-wsno9lv1 lit 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. n3ozg,rq7 0 * p0hcnbqThe impedance of the circuit increases if R increases. When is this stg h zc rq37n0o,*0bpnqatement 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 ume 6lyab;b- fmg 2:k hmk:(y(e1idm (ml 52pcthe 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 serie9b6 .q 9m tdnu9h,npies circuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance bo*x(,t5 -fbowf o3m; zz psz.enth double in an LRC series circuit, the resonant frequency of o-nf zfbxmt;pew3.,so*z 5(zthat 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 circui zbhdnfo80wy b08)-pct that 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 f:f;xy s vt62tRLC 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 rotating 543 8xfgd jys3.bxn bdin a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the p3 jx 53s4nf.yxdbbd g8lane 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 t(qfui9*/n h ppdyt6.rrz/p2in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop whez h/6t*qn 2p.(/t drfiupypr9 n 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 tieu3n 7zbpm 4s-b/ /l0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux thr4iusn pbt-3 bm 7z/le/ough 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 is wq4 81lok/xv u 9u(wkgreduced 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 changes frog(a9.wga8qrdptx r0mcoa4 t;gs 2-1 gm $4.0 \times 10^{-5} \; Wb$ 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 squgwhvo:ue- 4+ lsie(*o9;x shoare 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.o +hs il4xh;ue:vo (o*wsg9- e50 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 1 :afht668gr) i gvkms1fokj)-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 and as8 raaey 4a)o.i3 vm7crea $0.20 \; m^{2}$ 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 horizo+4ibqc7 -gujr inm,.sntally at a location where the downward component of the Earth's magnri-gcib q+ 7nm.j4,su etic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rot6 au eoa4(2hlj/fn7 se0oo5 jsates at a constant angular velocity of luh5ae6joes7s 0o24/ oan (fj 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 4*m kvf(ljgul8k v* )wloops 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 of46qg.fnn u-ozm.a 3uchivq(0 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 rectang*ks 3edbv oa7:x9f9 h +jhju2fular loops on its armature. 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 t2fdofheuxak+s3 j9 *b:h 97vjhe loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of area z*i.7 8/zkdn8yh 1x i ,saw8(fobmbdk+2rgfm $0.090 \; m^{2}$ 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 oud 5-oj(xr bpfndl)k2e+. 2ramtput of 12 V maximum when rotated at 60 2-dkmd+ x5ojrb )e(rn2l paf.Hz. A magnetic field of 0.050 T is 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 g992 i5uv;wl; ikq6jqdv/gu g0fqa7uqenerator 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 of 6.00 W. The motor operates oxs v3(s9r5z gtn $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor operates-kyj a2l 5qw.0xsr 5bz on 120 Vb2w5rjqxz .yls5ak-0 AC, and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected tovl8b: n at3s(m*dnh+s a 24-V power supply. The operating current is 1.0 A. Wh*:shm+annb t 3sl(dv 8at 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 co 3o8ceyebd +1innected to a 24-V power supply. The operating +o8yei3db 1ce 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(6 kc-tgk ;mxfo d3td* resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed.cdtt * (xmk-dfog 3;k6 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 1 v 83hpzf4 bx-)wwpedewn:t: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 14 A to flow in the seco3(gbcztie)yctr c* h( 4 ucg)-ndary. Hzcbh3ce-tg 4*(yrt cu)(ic )g ow many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a t)rj2v i rhp05t5yvogp:.u4v110-V primary if the 24-V secondary has 100 turnst g2.45yvhpr)v v0r t:ui5 pjo?

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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 secy rxhk.lmz0c+. l* hx *rqlh2*ondary coil. If x*h2zr*kqrhcm.+l* 0 l. hxly the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transffwn78oh9w -ilormer. Assuming 100% efficiency, h7inw89- hlfowow many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. rt6qu211 1n jktzw+a0-r ngck8 h xyit,li 56dThe primary coig 6n1+-2, i clr5ri1tyukjh80 qnx6wta 1tkzdl operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its c4wh: 5k(j7pt6wh*yq wy g7ozsecondary coil. If 120 V at z7g7hq:wy p(65k*4hw ocjytw2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer h5a +z9ximj j y9x;-eucozt5e0as 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primatxcajeozx9-zy 9u;05 e ij5m+ry, 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 turns. If uiwc ksm8m89(t/a: ezthe input current at the primary i eazu8wc9ms/i (k :m8ts 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 transform 7aswlq rut()+er has 100 turns and its secondary has 200 turns. If the input voltage to the priq+ru7 a)(tw lsmary 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 transformer has 100 turns and its secondary has c 4v6w4z,vo9cm0 hkby 200 turns. If the power input to the primar6,4 yomz9 4chbv0c wkvy 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 ibv(ext0 myv 769u,-pvgp(avas 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 primary has 20vpm67a,v ( vx0ey(-tbpavu9 g0 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 vg0 b0w2tnco o1zw z2:noltage 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 poowo zn z0ncbgt022:1 wwer 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 vucn3 iqb qu,211.fxcl 7lh 5gcurrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance ,uc5x vuclh7in12q lbg1.f 3q 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 y npvo+ c70h2. ypgzb*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. Why0.bo2vppchz7* yn g +at percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A gww.q3 w8pb j3senerator produces 100 V at 70 A. In order to reduce energy loss due to heating of theq8s.3bwwp3wj transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power would bt-bl q jb9jy8bc.o ytx28,d r:e lost if the power were transmitted at 3000 V insxt,ld t ybj2b89bq8jr.y:oc- tead 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 20 A. It 1wmcz93+tmgk b.9 vosvw1n,sis 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 if the power loss in transmission is n ws9 11nb3tomkmg9+cv,s vz. wot to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is store2 bqxq;nxegtn4,mj4e8:bym( o:pz c:d in the coil's magm zx4nm4 cenq:bp: t2q(y8x ;goj:,ebnetic 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*k+lhl 38ymnxzh75z r 6.0-W resistor and an 18-H inductor. What is thil37 mlhnxzh*zk 5y8 r+s circuit'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 cib a nclax-.l:+ ,ra4ldrcuit 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 120-V AC outlet. What is the p dm2fdx;,,k m8w feke7eak 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. Whatw .p8tswo2-yn hu23 n p;iel7y is the resistance of the la eo3p piuy-w; 2hnw7lt28.nsymp?

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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 ;dq7bx j+l54 xnypxa9 a 120-V ac power supply. What is the peak current through the resistor?a np95; y4x+xj7ldxb q

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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 )83 svjz854 s8z vfijodcdjz3120-V ac power supply. What is the power dissipated in 88 sjzo3v8sz5j)cvdjzi4 3 fd the 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 50-W resistor is2mqy* ux j +feksp/i9) $I = 0.80 \sin (240 t)$. 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 resist gkn4,r l8znkr +v,op)or 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 5f rc j9g1g( ak)/ua/tb0-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 inmemf6y, ux:o;w,y* of a 1.0-mH inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance lo a ibj bd b(ng)h1dy067ji-0of 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 in06 xa**oh* 3 hg/2xqxwv b+1vl kznpxhductive 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-* aa9jspzx;d3m;g na 157 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 120 V AC aghtp ola43:;ibn)o 1mt a frequency of 20 kHz is a1at obhl4p og:;n)mi3pplied 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,b wh4pjvk o+xge,ek5avb: g;w7+0op 8 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 capacitivpi*c)qv 8 nh-da*bat2h u m-+ke 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 needed to have 50 W of capacitive rea:jmau9 a ;2ytactance 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 hav,u1ukyjw(oqf9 dm; q+ e 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 . n8m4p19nkuzx/wwt8 isaieycni4* 0 of a 0.010-mF capacitor be 100 W?t .e*win4w 94ys0 pin am8x nck/zi18u

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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 z qbyj. cf,o1(a 0.0010-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 W73t*eq0 mao)(8wl 3vuhh umkz2 o *wbu resistance, 15.0 W inductive reactance, and 10.ok 3o *wu3)ma8 z b207u qlme(vtuwhh*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-kg;/af* 5xn/4k4d mm /hdb6d q;dglbu W resistor, 20-mH coil, and 1.0-mF capacitor are connected in series?gu45d; dm/kmk dfl/hb/*b ;aqnd6 x g4

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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-rifo ,zp .3nv2i7 lq vdr98h0omH coil, and 1.0-mF capacitor arenplrqv 8o2 hi97 fr,i30vo.zd 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 connected in series with a 20-mH indun7 d;l5r;ajzc ctor, what is the impedance at 100n;;cr dzaj 57l0 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-mHv tw43 ln4z6nz inductor, what is the phas4z46vlnw3zt ne angle at 1000 Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF capacp5ir-ujmwj 1 -itor for a total impedance of 100 W at 1500 Hz?1jr umj5wp--i

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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 capa4 +l0p-fxkjb snm4vq3citances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2000 Hz?fs+4pqmv nj4lb 3xk -0

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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-:s z :j;g: npvc1ks ,qhc gc5;0xlq8ydmH inductor at 5000 Hz for a total impedance of dgq5g, c::lnz;0; cs1 v hkysjxp8:qc40000 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 resistorjvs-l4dyccp63 9x 3oh at 1.0-MHz for a total im3-lcxsj cp3yd9 o6v4h pedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series wpv ah44v jnx70sc 7qxoxz*5 7nith a 20-mF capacitor. What is the impedance at 10000 7vn 7x5 4*s74xxhvoqpcn jza 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 ovh+tchkuzs8+*g smtt 8 -1*n+;vb yd capacitor at 1.0 kHz for a totab-+h v;o8duzv*stmtg+tsky hcn1*8 + l 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 capacitor at 2yfl4 q2m:edy1.0 kHz for a phase 4:e2fml 2dyqy angle 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 withc;pqx,4mpp f0 hfx,c xu8ux, / a 30-W resistor at 1.0 kHz for a totalx xp,f/ 8xhu4xp0c qfpu;m, ,c impedance of 45 W?

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128#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is in series with a 100-mF capacaql7g1r x- + 1oxm91cxahe. yu/bw o;vitor at 120 Hz. What is the pha ay-qo19m.ux ex h71orb + g/a;wvcxl1se 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 Hzybtw . a8 1uo5,e8pczqm1bch 0 if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serieby1 t czpue0 w15,ac8o mhb8q.s?

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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 capa)h4g:fwzf9rm wfr /o 7citor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supmgf wf4)rw /of9zrh 7:ply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reav 3:y vcpkdcv; +g)nu*ctance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current3 unvvc+) k:cy *dpvg; 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 containing a 50-W resistor, a d84bp6sqqhif adx73w +tq69q, qsl 9t10-mF capacitor, and a 0d t9 48d9qahqxt b6 q w6sf,q3pis7lq+.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 1wg )cebx1t)u series with a 500-W resistor for a phase angle o1tuwb )egxc 1)f $40^{\circ}$ 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 krpmri:aqj59o7 rr 9y7k 1fg :frequency should the circuit be driven in order to have maximum power trair arf7kg :p9: qmk1oy75j9rr nsferred 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 a,;tp40 7/iqf rwh bbdwith 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connect ,f/tqi ;07w4bhrd abped 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 circf5 d c:t9w1 kmo4zeo.bqz kv2*6pjk2 duit 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 hasokp8d pr4 xy3t,:ajl3s4a *mqnj :dq 3 an impedance of 60 W and a resistance of 30 W. What is the power4:yqj m 3s,pl3axkn:a jp*qddo4t3 8r 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 seriel(lm 2e b5; rhf*3yzbss RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz pz2my(h*lb5 es rb3 ;flower 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 :mt0 yb/;gxxc;oe (.ulk/ty yand a 15-mH coil in series?xbe y kmucg;/ xot:ytly.0/; (

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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 capacitj9 *vo-:k,r40 kmu crj0xyg.goecjl) or for a resonant freque)mxr9ol y,c:gj4egv 0j.ukjo- 0r*ckncy 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 for a resonsanysq an6(/ xd v1hy +:ml2 x7nmt9w.ant frequen .ymamn lydt2xhxnn9: +1(sqs67va w /cy of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series 1w9u51:p eupvgg uenikm 4+. iwith a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is tw nkv. iuuu+g51e91i pp:e 4mgo be 1000 Hz?

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