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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 units of mag rm8hy;9 i1+ e (de3slc3kg+pw kdbt*rnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that *17dcqdb34 sfnyzhe( 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 wi6n fjb afc+0r2re in a coil produces what kind of change on the indu0jb2 + narcf6fced $emf$, 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 fieldg.e* vnto0i z+ through a loop of wire produces what kind of change*e t+izno. g0v 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 change oylwp585 y*lnk n the induced8*lpy n w5kly5 $emf$, 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 *qh 0vaoprrm6g-0;qa*ph d, a from a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current e.s+d2 b/ xv*thjq5c pin a conductor will be that which tends to produce whichx/vbhj *2+5.sdeqt cp of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above itsfwod1;fj8 qd + center with its north pole pointing down. The stationary mag8ddfwo ;f+1q jnet 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 bar0s4cuxk 1g x clgr;/2xwd t73h magnet is held above its center with its north pole pointing down, and release;txg2rgk03 4lsxwu7xc/dh 1 cd. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector poin. c3qog gyjm )qg-se0ti7n x.pxh3x8* ts straight up. The magnetic field van)xsei jxm- g.3qyxp0q hocg7 g83. *tnishes suddenly. When viewed from above, what is 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 d6;-jnzfc kb 3u*aus /level table top in a region where the magnetic field vector points straight up. The63 /; *cubuzdfsa-jk n 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 mm(nx8u;0t+ca6ku- g uk 9aaqt5 :cgfbagnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disap60+ g kucq mbtnug x5ac 9:tf;a-kua(8pears?

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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. d5clr f9ha07t32pznp nep u*g- i+yq and carries an ever-increasing current northward. Two coils of wire lie flat on the dnu 07.z+ p2 -a 9f5lcnphg3ypr tqi*etable, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls through a loop of wire with the north pole enwko 1agtt6.t3 1nk.iytering first. As the north pole enters the wire, the induced current will be (as viewed from abokgw3tttan6oi .1yk 1 .ve)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis who2ja* k3aa ,wbq1dx rsg7 6x2bbse direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the ind,2 xkq s7agawx21* 6dbabr3bj uced $emf$ 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 angule nfdhln/-n) kj*q. 72ixoky3ar speed about an axis whose direction can be varied. In a region where a uniform magnetic field points s7xhi3oj. knl/q fd n )*knye-2traight 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.kjo :3 pw; 5stncesg2sg(/2ze
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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 anukk, um- pij)2 $emf$ 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 ,0mm0oc) 8q-7pqtqtro. kfq m a magnetic 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)i*glbvxihan 2;1q )- l is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potentialq g2ilxan);i lbh*v- 1 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 consns lq ,-/lvkp9iqp/ +ztant 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 generatoc y;ne+uj-h19y ntv6zr transforms

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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 secg;x,gt1d hb; o;,o kl.tvxb3uond. The frequency of th,v g ,k hg;bxlto; bdxo1u.t;3e $emf$ is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device u.aph0q 4s+bvpxbki-0sed 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 thati4nkv4b ) ng2iqve687cizm g+

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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 loophpggisg-pj;pf* ,* *ss than the primary coil then ;g ,gphpfj*is* gsp-*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 contains more loops than the secondwb1 tbi,0f l4gary coil tbw f1bg0it4 ,lhen 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 p6(4chty fqrr38s1 j:sa d*rfgower 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 crn4b68 3uaag aircuit,

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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 connectedxm npgd 7;g-n, in series to an ideal battery of constant terminal voltage. At the moment contact isx,7-m;pngd ng made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series tosxjw7a l/ t8lim g6 sbq*)h40j3rf1qf an ideal battery of constant terminal voltage. 8 mtl) 4 qif/ jjlwq630s b*g7rafs1xhAt the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with in6qz(. jhyh9ei dwi3 sib1ab. (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 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 induct(xr m7rw:h2qu5uvrfo j2m0 t.ance 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 ezw0kbe t+q7-q ,e2c hconnected in series to a battery. The time constant for the circuehtek -bqe,+7 q c0zw2it 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 inductow: a gv8o6k v1(z1be prne4/hrr are connected in series to a battery. The battery is suddenly removed from the circuit. The time cownv4 /e1ohazg8vp 1r( :rbk e6nstant 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+yw9oa/mtu o zcz i:,+ve 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 )wmzfo 30j)twan AC 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 po *dgp+ 1khslv(1ihpk ,wer supply. In this circuit, the currenth1 i h kd1vgl+k(p*s,p

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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 55 lnb;m+x*pk zjxma2 an ac circuit changes by what factor when the frequency is trij2z +5bxpx5na*kmml;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 */i:ec 2fv teifl; -vgl-0pvndoubled, the inductive rel0i 2ple:cv/*v-fitf;eng v -actance 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 across an inductor approaches zeseht j:x.owfn3 p ).k*hr-xx7ro, the inductivexhjfn hs :7.x k wr-)t.pe3*ox reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to agyn d2 i41/m(mrjmhmcj-tt 9e3ez4 7kn AC power supply. In this circuit, the currem(34rj-47t /mmzhkd2t 1 mj 9ienyce gnt

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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 circdyhiwzvgf:)ko ; aus4q0q))1 uit changes by what factor when the frequency 4qa)ys)woh;v) ifdz: 0q 1gu kis 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 ac;kievkv -a-k8,v2dk j ross a capacitor approaches zero, the capacitive reactance vk,2-; kiva8kd -kvje of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of thgd1 *e:ju.asm e inductor and capacitor in a RLjge1 .*udas: mC series 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 tr1 8)gnfq,xg0fs6n ois 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. jw n(xn-eu5*dz7sk o6The impedance of the circuit increases if R increases. When is this staten jke65sdownu*-( 7zx ment 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 impeas) nl955 swl xmoofzb3)it1/dance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the ce y8hhz n7jn7zo d60zkh.vz3 :ircuit 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 ug t9i8(: exkean LRC series circuit, the resonant frequency of thate: i9tg(eux8k 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 circue5: ;4hl zjdi7uid.nc it 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 RLC circuit occu1to7)xirlcmzvl(0v ) 1+s9lz ;nnfb wrs 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.zlr,9.r5tdw g2 ;d glt10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and th9d2 rz,l; rl5dw.gttg e 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 ov -: a0xdrs(pl a:/gipemc ) 7swhg7f0f 0.20 T. Find the magnetic fluel a i0wp(-d r:h:m)c7 gv7fsx0gs ap/x through 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 rotatink/zz;bu2o)m el3 )br sti-tp(g in a uniform magnetic field of 0.20 T. Find the magu; b)/ko l(sz)emp b2t-3tzi rnetic 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 9:.gpl -gjiqgsingle loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a co 8cql.xemf +.n(s9eeoil 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 square frame with sides 18 cm. A :2f1 hozq3m dbuniform magnetic field is applied perpendicular to the plafbz2 h3dqm:o1ne of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turf**jdh:ebpl u*5 0sdf ns 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 anoiqky)j3 in,)zs idiq j8(95 xd 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 sp5 d z afo1qdot8tuwo+5*7b;zc an of 60 m flies horizontally at a location where the downward component of the Earth's magnetic +c5qoofo 7*tt du1 z5azdw8b; field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a c3nj 1fj;k 6/isy-yzogao tn,6onstant angular velocity of 2.0 rad/s about a verticaj3 o-ysan g6o/i, 1j6f;y kzntl axis through one of its ends while in a constant magnetic field of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cr*(/9-qr tnc yr4r vhaooss-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 consibchm,kn 3i0;lsts 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 $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each a9pi ybx s0;z8loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage ;z 90x is8ypbaof 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 b q7hg-d,im cy:,nb y7 jig1z: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 4gt85q3rnulzrk b:,wwith an output of 12 V maximum when rotated 8t :,5w4ubzglk nqrr3at 60 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 generator with a6t ajo+mrc, c 0i/at+h 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 resista+(sjeore6rn l,9z h 2pnce 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 resistanwxkl4g a:u;l ,ce of 6.00 W. The motor operates on 120 V AC, and when running a:;ga4ku wlx ,lt 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 connecteux*2v9pqy5ec- z h a-ed to a 24-V power supply. The operating curren5z huy2-e ex9pc-aq v*t is 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is c u7ju qhmx a /1wy:i4p*, 2gw58uzi8enqx5vltonnected to a 24-V power supply. The operating current is 1.0 A at fulli/ j5 yu2:gwqt7luhn uwm54a1q *8xz8pvi x,e 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)z2b0 duuqj j4)ou-x f is connected to a 24-V power supply. The operating current is4uj ujqob2 0u -)fzx)d 1.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce a primary voltyhd6 .d+uv96uq rf1hkage 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 9sip1he-5d-:t xoa xl flow in the secondary. How many turns are in the secondara-p9 -is:tode x h5l1xy?

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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 necvt(z2i7 ;osiy 0ga7f messary in a 110-V primary if the 24-V secondary has is7( tv aig027fmoy; z100 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 a 2000- )1oe jfpys49 bbwsqvgs+kx:e4k66g 7turn secondary coil. If the current in the secondary is 3.0 A, what is theps)yb ss4 b6x: e oeqkw+4vjfk79gg16 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. A w cx-1um;psl:ssuming 100% efficiency, how many amps at 24 V can flow w p- 1ux:cs;mlin 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 75.3*x exsjd7ar:qjl, kgp ma;:00 V at 10.0 mA. The primary coil operates on 120 Vpd*ak7rx3 a,xjmj s:eq;l g:.. 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 30a bmjk a qk81:2rgs1s20 turns on its secondary coil. If 120 V at 2.0 A is applied to r2m821skqg:ba js k a1the 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 tog ytfpam1 ;;m5jwm v7d9sx:9 urns on its primary coil and 300 turns on its secondary coil. If 120 V9g 9;w fjvtmmp71 x so;amdy:5 at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 t:pv :*je l,nsqurns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondaryq:e:*nj,lp vs 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 secgbov. hzm 407 r+uw5jrondary has 200 turns. If the inpuo 5rjr b4hwvg .7zm0u+t voltage to the primary 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 c+ s,zlt7xlabun vxgnx0 754)has 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power outpu,n75+b7x xvalt40sx nlug)z ct 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 lid3z4jl iam 2m )v((kis usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the( 3mz 2dj4aimvk (li)l 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 -yk 6cl0t63bheq6 .p1sggl jx3x /)(gaiwjbg 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 percentage power lost it0l/hx6b)ea .gb qjck ply6j3-gg6(xiw s3 1 gn 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. The t3am7cxb(1yx 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 transmission line if the vobyxm 1(cax73 tltage 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 lonh/b8v ptxat8+ b-rg *eg 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 transpxt/ hta*rgbeb -v8+8mission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50p n5dq,8hjyr0vm1 n)i km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In orde ridh , jyvpnn5q0)1m8r 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 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 tem6 a*01bllol-4w yd V. How much less power would be lost if the power werw1lma*4e0l yol6 -dbte transmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be tra6(af py6(aiy fp kuo3.nsmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up w pi.of(63kpua (ay6fyith 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 much energy is stored )jtzc/: go52s.x, bwuw q rhu*in the coil's magnetirzc 5t, wh. )2:jgqxuw*ou/sbc 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 induo mu19w vx f8 6q-gwya1 hg/dlz)0er3a+t2keuctor. What is this circuit's time constanty823 gqmdao 9ak0 ee-wg)/u wut6v11fzhx+ lr ?

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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 thez5vl2+ly4 w2o,ft3d*ugb,n/gtl o pv 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 120-03ctp4g+ kxe0rs j;b/8rhm tnV AC outlet. What is the peak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the resistance of the laoyy 1cf37fv -dmp?v-yyff c73o 1d

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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- 9fkot5kmnu7 3w p)6wzbp4hx9 V ac power supply. What is the peak current through the resistor?kpf3 47) xo wkwt9bzu9h 6n5mp

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the powe1aiiqws -(z(br dissipated in the resistor zb ((iswai1-q?

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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-Wv(q.xg3 ,kcj798hxtzm 8rb ad 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-Wtknc(y7 06b0oex qk5+zo s13b)pvve o resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resis4.zztr 4j7 al +pey:cmtor 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 ernez70 az: 3ismfq/ r*4b);lmp .yrb 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 of a 2.50-mH czmrker06n*azchc//6 . g pc0 toil 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 inductive reactd)qh d-lg7a: fance?

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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 indtxd.p c w(wymmb9) /u5uctive 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 uptdq 9e0x 5j1uu:q17 wqv rc0when 120 V AC at a frequency of 20 kHz is ap9q:r tuu5p11deuqqwcv 07x j0plied 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 c0c3h *d0vn,aj x bi(a8wy*jr3je yzo9 oil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF -: (j kopukdk5capacitor 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 Ww9rc 74kpnm0 -4yx 0 spnk2j.isjpb1b 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-mF capacitor9v d3l*f.yx y. ngwg5r have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a . +1ot dznc(kz0.010-mF capacitor be 100 W z+ckzd(1ot n.?

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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 0.00 l+6xzltf oz.310-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 seripkji 9a:y+oz xtf2*w- es circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 xz2i*y9+tfp awo:j k-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 impesw87o b/godu8e 6ihopv w;09 cdance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor aw9 pwoe 887;hocbsi g 06vuo/dre 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 2zyp1-vrg ex5 lc0v8sf rft)-1.0-mF capacitor are connected in series?-51 tf xg elcvv)rsy-20p8fzr

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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-w-y6et-)uo ivmH inductor, what is the impedance at 10)uw- ot-iey6 v00 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH in/- kslx) avq/v n t, )ismti664j7qgdmductor, what is the p7stk,iv)/sqt6av)nj-g/l ixq d 6m4mhase 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-mFz , zf .wf0v4cka)jy;x capacitor for a total impedance of 100 W at 0v;f4xy. ),z kfazjwc1500 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 n7u1n qrj .4neqfs+ev*eeded in series with a 100-W resistor and 15-mH coil to get a total impedance of 110 W at 2jnv er+f.1sqe u4qn* 7000 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 at 5000 Hz for a tozu wrq4m l n39,c*b4tu6od-tmtal impedance bmotunlrc d4,w 3qz9 m *tu64-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 bxphr)*s3lls* ol 9z *rhc+; ebk7tfp7 e put in series with a 100-kW resistor at 1.0-MHz for a totlpf*ss7t +zhrcpolh37bx; )e9k r ** lal impedance 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 with a 20-mF capacitor. Whxf+msn df1zyi;)n.yhkne/ 5ig/ 5m :sulq.n ) at is the impedance at 1000 ie.)mislknx5sf:nmu dnz.y/+)1 ;gq/5 nf hy 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 capacitors( 87cgx :p( (n0ucdi m9mjlex at 1.0 kHz for a total impedance :xg(n7 cjs0(mixdc 8u9(lmp eof 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 kHzodnu, /xw*i4 b for a phas w*bn/d,uo ix4e 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 with a 30-W i:tq/0njo, ms 6qd uv 3upnm),resistor at 1.0 kHz for a total impedanjti,3d) nuq6pvn sm :0m/ q,uoce 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 capacitor at 120 Hz. Wha*d qq ag,5.t3/bc vhoit is the phase a5iq3g/c vho* bdqa, .tngle?

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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- .9qvfd am0nqe2 rsu+5o,d)84vbvepfmjrm:3mH coil, and 1.0-mF capacitor are connected in series?5pv4dna q2m8j:3u bm s+eofrr.)q,mv0v e9d f

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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 1o(cvi.dl5/ 0hjc / ob8pz4xfb 00-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-8/dlb fbv(icz jxc/4 0p hoo.5V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and an iug0e;riw,/n6 g min 9gnductor of inductive reactance 30 W are connected in series to mng /u9i,0rewi6; ngga 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 contrlqp1avx 2 -m::efek:( hyc 2aaining a 50-W resistor, a 10-mF capacitoha2 px( lv:-rme:eky21aqf: cr, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase angl4c wp-c0i; s /sjwjrv.e ofccjpwswv . r4s0i/-; j $40^{\circ}$ 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 = 20eh86d qc t0 gvu3-k7sc.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the drgsetvucc 0h 3867-qd kiving 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 resi;y msw1iccu )d1g, ku5stance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V power s1iucg m w;u,k5y ds1)cupply?

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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 c z nv3m03wlu6fircuit 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 resistanfn o 1kpkzd q40qiyt +6h+sg8(ce of 30 W. What is the o0qz8i1kkh4gq y df+sntp +6 (power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit contai *xfq28ve: ndv oytq.2ning a 50-W resistor, a 10-mF capacinfv.v8d2e yx* qot2q:tor, 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 *te0ex a yr/m+coil in series?tyr*0 mxae /+e

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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 + xpl.yzde6a 5gnm1x 3with a 4.7-mF capacitor for a resonant frequency 3x1 6zmpge +5nxad.ly 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:as0p h-j9gd p for a resonant frequency of j9g:p0h- adp s1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40-mH c*wxu* (lj((8s iol cn3okmgj+ oil if the resonant frequency of the circuit is to j(l+xikuo l(8s njmo*3gc*(w be 1000 Hz?

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