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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 unim fzbj-r2x4 urns h(33:ls *pkts of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states that t)bayu 9hwk 88)j xt4ruhe $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what kind ofcwn7+* xpk vt1 change on thptv x7+w*n1 kce induced $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop of wire prooz9ym93 j h9m 6r7+phd(pxc nqp;qvm 6duces what kind of change on them6n9 6m qpmph;q3vy+9dp 9j7ho(zxr c 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 producn lzrgx.- 52y 3p9dorwes what kind of change on the inducz2-9np3yodgxrlw r5 .ed $emf$, 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 rytcmzeww8vuh21 x1+73 k r3kfield 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 ind:9 irs+0e ar 8l-yoj5ehpb 1ibuced current in a conductor will be that which tends to produce which o byberi0a9 jihr-8+ os5:p1lef 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 its,dye1s3k8qmt 9 xv c-+*rde ls center with its north pole poinmsqyd,3+skectld ex-89 *rv1ting 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 held above i*km;xy-q me+t ts center with its keq * ;mxy+mt-north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field vector po 9t2slrbeq*na b;/k:oints straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the f2e9 b* s;oat/n:qrlk bield fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a region where the magnetic field vec6q6 me o-8g.x/pf:ktf2izdue tor points straight up. The magnetic field suq8 -fgu/ edft 2poem66 kxi:z.ddenly 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 tablvo;5*mruac7 h s)mk0 ce top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced curre7;k*5uv)o0smh m ca rcnt in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horikz6zkvl w+xw71bbims+r/tm6lupq( ,9 j b 06mzontal table and carries an ever-increasing current northward. Two coils of wire lie flat on thwl01uwbp+mikbbvms +, 6 m qjk r6 9/ztlx7z6(e table, 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 no2yfni,u( py4qb3.i vjrth pole entering first. As the north pole enters the wire, the induced curr 4pq3 v.yiijnb 2(u,fyent 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 aa+g(zzc t53eit constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field p5izte(cg a +z3oints straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotbwit pf *w7:2rated 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 orientati rf7t:*2 wibpwon 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.w886h7ie9x+ewx ac jm
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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 an u cvu+t f/v7u,vs9;mt$emf$ 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 m*b .z3fyly x4.gzyk9tagnetic 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) ismsm5eqx;, .f9llj:f e moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential qf e9esx,f:;lmj.m 5l 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 cons :ycyw,z)- 1y/hndogdtant 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 transforeby f;o;0u d5o:kg ut/:8m0zdhwtx1bms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The freque0ma o6(j) kk(r kj+vvpncy of the )orjk 06amk(v(pk j +v$emf$ 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 used tg xp/ 2p5yefg+o

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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 t cw7oow 3c;wrq;8wu nm*zn)*q1c 3iothat

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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 c: ka p 9v1fum0uk5yj:than the primary coil tha:9kcm1 f5pu 0vy :juken 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 5ozzqh168 vee more loops than the secondary coil then1ohvqezz 58 6e 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 w8v tysami8( k;5/cz ppower 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 cir4pev r /ibe+ ,sjxxf3 1zbfhn)9hc 6:(8 rpvtxcuit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in serir+jq1t+x5f, r mv3yf( 9o g;jhepetd+es to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistpxj3h,tr5;v ff 1 (+gj yoe+mq9e+rdtor 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 s(el p ytk;k* qm5yzbk986:twseries to an ideal battery of constant terminal voltage. At the moment contact is made with the baty bskwkt l:;zq tm58(epk9y *6tery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is 8t ) ejmqc1):jfhr6rwbkzf5v8i)1js 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 Rkwg;6sjuw i6gg5/u*oc +cip 5 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 connectes*kq daw4fok ;q9n+9t d in series to a battery. The time constant for the circuit represents the time requirfdq*wo4+a9kst nk 9q;ed for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. Ti vkz,5ki*. p+bm;x *mpjc:j dhe battery is suddenly removed from the circuit. The time constant for of the circuit represents the time required for the curre+:ji,.mcz5v km*dbpkp *j x;int 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 same i v0d3 x w,*ekva6m/ oss2(yahunits except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the kx +6*j: k.lto-m.icxewz.qmcurrent

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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. va rvsso:fkq:; e:jgy4o5x(81ha; ls In this circuit, the curren : k:5j xers1oq84f(sav a;g;slovhy :t

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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 rbr,-oo2-p+ b in+*; puvjj hpby what factor when the frequency is triplo*-hvpi+ j2u;o jr-pb r+p,n bed?

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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 inducdi,* l3sjgy+l/cd-. sdpx+ gctor is doubled, the inductive reactancpcgl *dlxyd-.dj3s + sc/+i,ge 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 indjso2 rb :c)8ae*8t sqqz d/ot4uctor approaches zero, the inductive reactanceob28d*o)qsqt:/ze8j rs 4 tca of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuiln9tsed586/ fkqh m7cr 15gjiyoe-vhk dz8 :9t, the currenye v58 9cmkd58oil7 etq -k fjn:1/hzg6dh9 srt

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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 fw9dls* j6r73p30m*j 8cl :wf1vc*lf ao er jwwhat factor when the frequency is tripled j 6p:rs*c jvldwmawwfr7 le*j3*f8c913fo0 l ?

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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 approaches zero, oj)6alvo,x)avbo);7 q lg, vbthe capacitive reactance of that capa,bblqv) o7o )xj gv);6oaal,vcitor

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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 volta)fxf /+z l9watges of the inductor and capacitor in a RLtflx) az/wf+ 9C 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 is kdmnf3nk) ;b+ 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 circuirp8f*p0i yja:3k1g t jt. The impedance of the circuit increases if R increases. When is this st:3 ga1kp8 0yjjf *irptatement 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 increrny6y:5dhk u +ases 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 ihvi kf8, kxl*mhg,5hyr1 8u; gmpedance 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 capacit 0y *ke bb8+7ja, tfsx:it1uaeance both double in an LRC series circuit, the resonant frequency of that cxi:k sb tj8u e10eyaab *+,ft7ircuit 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 dr o.dpgma+p0 :(fn-vcdiven 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 occurs whennzfun2vfl m+c *r4.q 0lbo65t

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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 rt j7ka*e9xo6a052wjg0h wz smotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fie5ja6k2etzjx0h9* wsgo 0 awm 7ld 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 fie2a;a2ltdk c uf0db t;i;nv; -mld of 0.20 T. Find the magnetic flux fatb n2 tadvli;m-;0;u c;dk2 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 z;l wnj,aa:fh1yd; n/ rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop an:aadfz1n;;,j h /lwnyd 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 reduced fho q0:y,9r xi8) zmrxx-nq i+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 coijtj) *wk/ hdr8limavv -x+ j4dc-ov9j/va95bl 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 p5,h1t vaak h4square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of k, t5 vhahpa14the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns *y1l n2v(6g vr8uiwhband 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 h:23gceiu:n barea $0.20 \; m^{2}$ 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 w:cg omf ,p0inozw 18d2ing span of 60 m flies horizontally at a location where the downward component o1,c 8 2dpoz0nof gwim:f the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long; w0x,ruh (kut;rq,cv rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant rt ;x0krhquwvcu,( ;,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-sectd:dkgzi3, xoh8 mz-)vional 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 consis)lqrl ;x91qgp ts 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 i2y w3jp,kzqm7ts 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 the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this g7zkq3 w2jym,penerator?

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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 wir-4cy4 yv6uzk ue 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 output of 12p0:,dehv3, kqe fg(vr V maximum when rotatep qkgd rve0,, (:3vehfd at 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 wg:mwu.q r93n jl4c,d8vv3gp h ith 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 resistagbp(ub82qif: es+. xtlpv .z/ nce 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 rb m7j9-(lnof 8 zageb8esistance of 6.00 W. The motor operates on 120 V AC, and ( 9g7emjf8bolz8n- a bwhen 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 isdt5ql l*1nga3: lx1km connected to a 24-V power supply. The operating current is 1.0 A. Whaxlad* 1ltglk:mqn351 t is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to anjhf9piqj (:, 24-V power supply. The operating current is 1.0 A at full speed. What is the baphni f, q:9j(jck $emf$ 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 r ldr ,z+ 8fkm9lb-rdex 31yh+xy;e.ueesistance 6.0 W is connected to a 24-V power supply. The f;re1m z.x-dydy luker x +3lbh+,9e8 operating current is 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 reduc8b awn(dae 97ge a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer causes 14 A to flow in the seconppct( 07yu y2kou*n; adary. an0ocp t7u* ;2ypku y(How 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 iogn5rf9 x a,pwwtm-1 2n a 110-V primary if the 24-V secondarytm9 rnwa2 px,-1gf5ow has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and :trmy,u2i rar-t,0t a a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what isu: t t0r-,rr,am2tiay 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 ;o r6y7p,7ot btkcn ty0eqjf (3vx1c+transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the s,r+tjv tqofnpkc3 y(eby7 ox7 tc160;econdary?

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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 provil/xmmw ;r*iz /wyn3*sdes 7500 V at 10.0 mA. The primary coil operates on 120 V. What does the primary draw?w;iym/s*nml wz* r3/x

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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 6-df qge6k- ni70 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applk -ei-f 7qgd6nied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turnon .;jrxmtg *1s on its secondary coil. If 120 V at 2.0 A is applied to the primary, n;gmo 1j* x.rtwhat 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. Ifangp0 f3kd:srwr -0 e* the input current at the primary is 100 A, we can expe*krdn :-swfa0e 03pg rct 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 transfogzm,wwfb 07mb(6g ;x mrmer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the seco7m;(mg, w0bb f6mxzw gndary 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 aqakw3z1 +c-u;i h gni4f;rte;nd its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be q;gifa n e- z3ci1+4u; k;thrw(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 1o5 f)svd 2vk5ihq- 7tl20 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance sf5)iho2 -qdvkvl57t 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces vqer )*;;a-1dwk+ nxs.bgl vy 60 A of current at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power li- vvsakb;l*) ngy.xd1q +r;we ne 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. The voltage is usually steppedy* /mlq8 ff8/9nol8g laf2nyv up to 458lf/qmn8v lfa /* 2f nyoyl89g00 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 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 lxh j( 7xz:he+8,tbwc/.;wkf q/ykc ncine 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 du ,kxt bjweq//c.+h c :;ywh(7k8cxnfze to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 /,)x u: wsbdlnm(,neeW. A generator produces 100 V at 70 A. In order to reduce e,lm nbnu )e:(swx/ed ,nergy 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 V. How much less power wouldf:2ud )3at 3k7c dhnbt be lost if the power were3b :uta7f 3cdhk dt)n2 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 transmitted on a lini r gg;/qv60lqz9*vgqu5x vp1e 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 not to exceed 0.0/ uvl gi09gz vqg 5qx;1vq*r6p10% 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 mufaz2x88rs 36 fxb j ti5nb,y8uch energy is stored in the coil's magneticb ra 3i8nfz8bu2f xt8 6,ysx5j 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 age 4 hja,4h5i18-H inductor. What is this circuit's time constant4e h j4,agi5ha?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage izd)5 l51fjo8x*sq xim s 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 peak curre6 clxqu3.+hhw nt?

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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 res7,a/v; abzbkl istance of the lamp?vb/kl7z a;,ba

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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. p +vow.x8 nxs4pnz*a w106o uc What is the peak current through t41o wv 08zw ux6ncx ona*+.spphe 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. What is the power di9;xkpc q e:-q/y vkze0ssipaq py vzk9-0k /qxce;:eted in 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 resist9d k3 0kqhx :qu4sr9cwor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor iw/n7ipv50 .6+lncum2aj . pxsg xo za+s $I = 0.80 \sin (240 t)$. 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 resistwp ps:nzxi.r2c f85l+ or 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 ;u3 xm,dyl ip712j /yg9desmc-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 o*lqlu.hs (1 yof 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 14.0vsl( yjei(g, 61brg5 y W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inducthpv h.yjr:* 8fuu)da6 ive 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 twln8q55 hbe4 .b syz6ql;ib9inductor when 120 V AC at a frequency of 20 kHz is ap n;qbztq5y95e.8 h6w4 lsibblplied 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 118r1 m 3fnhs 8fzh7,) vs9dnzns0-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 cmks tn k p*jbg;gne40zi/g, 61apacitor 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 reacta, (m7vb f,rx1xrugn 3 62q:vr 9gcmusbnce 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 doegrii( wp -3c1zs a 10-mF capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 100 aqru +7og2t*g1r pp+rWqp+r g1p2gorta* r7 +u?

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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 ay.p/sg*gvy t,+it i - z;lr9bp 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 s4nbd + *sf*lzeeries circuit with 12.0 W resistance, 15.0 W indueb*dl+fs4 z *nctive reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, andtmm)dnl99ub)w0:8h9yo kg li 1.0-mgl 9lwod 8im9b m0: hu)n9tyk)F capacitor are connected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 150zxsu rv3o .3s.0 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connect.vsxs.uro3z 3ed 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 connecteda(nyjlv:qa9y,2b:8 y . edc+hoqbaa 0 in series with a 20-mH inductor, what is the impedance at 10,abn0l+ 8 vqaay b:a9 2ch:yjdqeo(.y00 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, what is iqd*-(afc mwot0do sn,), g9dthe phase angwq,) osn (ida-9*f tdmgd, co0le 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 20-8j ojd*tk/;he5dz hbm)70 cwo3pbqu4mH coil and 1.0-mF capacitor for a total impedance of 100 W azdoto b c8p;)5j dh*b 4/khju3qm7ew0 t 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in seriesiy8opb ,3y;3,6 o (diwvh kyza with a 100-W resistor and 15-mH coil to get a total,ap3vby y(koh;,o8dz6 y 3w ii 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-mH2wae9vw32zh1otavh /cnxp6 + inductor at 5000 Hz for a total impedance of 40twh xw2zn+a12 v3he9 v o6pc/a000 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-k(ytels.onv l2g t8j( :W resistor at 1.0-MHz for a total imgvjy2l (:(sn lo8tte. 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 with a 20-mF capag5 36fxa4a jovunr58 hcitor. What is the impedance at 1000 Hz?j6fovrg543a un5x ah8

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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 seri vb+/y*it8mi6vtf7 ztes with a 10-mF capacitor at 1.0 kHz for a total impedance of 4/ ttm6*vy+bi78 tfivz 5 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-;wuj ;(t+:4pk bwwt hv4u en5hgqge6 series with a 10-mF capacitor at 1.0 kHz for a phase angle ot gb5uj(-g v;ee qnw;p6+ whk4th:uw4f $40^{\circ}$?

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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 resistor at 1.0 kfk1mhu n-59wvc evj:a4s r ,u(Hz for a total impedance of 4h4: rwv(e1- nmfc9v ua us5,kj5 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.znjxr o v: kk+e39/m6v What is the phase 3ze9r v/6mnoj+v:xkk 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 ums*u5a cq3/w pba.n7and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected .7/35aucp mnsw u*qbain 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 resistck3 -3 0apsooxy jc(g(or, a 10.0-mF capacitor, and a 0.350-H induc3o gx0ck -yja3 sc(op(tor. The circuit is connected to a 120-V, 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 capacitivd4-b xf3b8 xjee reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circf bej8x3- b4dxuit?

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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 c/ s 53)r( ,bkldlm-gdfj4 vx+me( wrruontaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60m(drj 3fdmg,bxl-ur +wke45l sr /(v )-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 serijpu+5g rgc*4t es with a 500-W resistor for a phase angle ofc*g 4rjt5up+ g $40^{\circ}$ 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 frequenmm hhub :w)5/;n*ielebej:3y cy should the circuit be driven in order to 5w e b/:u nilem: h;hj3ye*)bmhave 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 sq3y ;;gs1aqzh eries circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuaqh;q1s yzg;3 it 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 cira rcqbf24wba w(v( a97cuit 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 ma:gngsm+d, t,8.nwb of 60 W and a resistance of 30 W. What is the power facgnbsw:, m dm8,a+g n.ttor?

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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 fao * 4(eyqen298drnrkr/3rxca ctor for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to yerrrdn* (8 o9n/ 3crak24qxea 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 1xl7cpb*vszyzx 0u,4 ;.0-mF capacitor and a 15-mH coil in series?y v0sxul,4x7z*zcp ; b

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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 capacitor for a rx;to ,0 wdaes w7p5n.eesonant frequency of 10 kHzd5s 0nteeww a .o7;,px?

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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 ajfg*d/u aw.(t;qp/dz58g zy+j j0imqt9 (m d t 3.7-mH inductor for a resonant frequency of 1000 Hz?mjmdz/tq(tu9dazq *w +;d(i/j 5gp .tfy8j0g

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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 hswu/e 74fe) e2xh1oboib 1ex7f4sehuh weo)/ 2l if the resonant frequency of the circuit is to be 1000 Hz?

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