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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 flux exce lbuou5rik69/u/s 52 n8-dog exfj( rspt

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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 c )yr89y hh,o4kt)mwqthe $emf$ 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 wir(rtuq2; hak:u(h+tv- q ycqa6e in a coil produces what kind of change on theua v y- 6thtqu r+qcqk:a(;(2h 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 fie1*-alg-7ac pax n 1bqz4r/gg,hj h6 bjld through a loop of wire produces what kind of change on the induced , q1bjhhc azgl/png 7a1gx6a-4* rb j-$emf$, 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 king.0utpdzq)w v6ay 2a9m1qf8ydc/ a:o;/b zmt d of change on the inducedfm1q9y amztd) c d yqt6ug/ wa8:z; oa/b2.p0v $emf$, 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 :r6fc(ymr sq,m( 48k8 *bkb0x m 5zayvn5pvuxfield 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 in a condub29fl3gky /qp ctor will be thkb3 pqyl/9f g2at which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnegva;6oog 3 hb8t is held above its center with its north pole pointing down. The stationary magnet induces (when viewed 3bho;og8v6ag 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 ldk y5sjes(*(c if*dn1ut)a+ bar magnet is held above its center with its north pole point*n(fi) esk*51jualt c(y+ sdding 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 pe*3 vla,b6oghoints straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this lv,a eo 6h*3bgcoil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level tablemyk0qxw, n8 qx59yh :rk ;c.ql top in a region where the magnetic field vector points straight8qclq rxq.y05;kxkwyh n,:9m up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region where the magnet) -5(+thib eq+otuntpic field points straight down. + +ttbo ehi)utp(q-5n The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current 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 horizontal table and u:)n/1v7/pk z jscetncarries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from abov /)tz/ 7kcn1en up:sjve, 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 o nl-kqs db4*u9mw/;; hbe7drnorth pole entering first. As the north pole enters the wire, the induced current will be (as viewed from abb;; kl*dqd o-r/sm 79e4u bnwhove)

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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 a 2 ov3psbvv o3*nl5wj*bout an axis whose 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 vvpnls*oj w b o*53v32the 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 speed abu of2d2e lm:l09kvk7xout an axis whose direction can be varied. In foulel70md2:9k kx2v a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be 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.;-d v 4prkym 5srqks/(
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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 thrgkx0 l( (nxg1* 1calnat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnebo592e f; wmgjtic 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 direction4:o;ot0 v9mc+l)azkacs /d.nocxr * d ) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod o/s t40olmda. a)cxc9rnvz +do c;k*:.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bq(z:8qsqz* k8gr7glngxs s9rz f 9 x26ar rotates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generatorn6n 8x3mfl*xi2ntj*2c 6 sga r 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 re+ a8kp5w -ei( awwh2rrvolutions each second. The frequency of the 2-k(i+ewapww85 rhra$emf$ 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 to *+s3l mvlfz9o

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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 b9g ,u.mdud /y+i 5ktpjn( co4that

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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 mut1a/ua z9afj/dljm 8 6v .r(lore loops than the primary coil then it r1vf(d l 8 tz/uu/m9ajaa.l6 jis 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 contag1 w o *kul-eyc3:gn;fins more loops than the secondary coil ;-c olyk3fnu w :ge1*gthen 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 power inye.e.w,e. hjeput

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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 circucg3b6n w7c w+rit,

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an lc10y*z8yi izvnf7 b5, , zjalideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acro8z ni7z1cyjlb5fl 0, zay,*viss 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 to an ideal110 r/znys:zw 7hy 8 tjteq9dg battery of constant terminal voltage. At the moment contact is made with the battertzg17/8r9z jse:q y1td n0ywhy, 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 conjx.hcchb -n .4nected 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 z fy/tk:y/*0 aw:3:g qbrceui 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 connected in series to a battery. Tlgn)+rk/muk) v (e9ve he time constant for the circuit represents the time required for the current to r(ek+9) lgmu/ ve )rnvkeach

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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. Th*ho4,w uyvs3:m2 ) oxb 3i7 i2yrpdhiie battery is suddenly removed from the circuit. The time constant for o2bhm7v4w i si2y*po: 33 xh)yior,di uf 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 samelo2 ;o 7kesq8s8 fdh1o 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 connec6jjf. qml7z3x 3lm vw,ted to an 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 power supply. u+adad(z7qtgzis9(tbe x69+ In this circuit, the currentazq+du+ t7 (i9eag9ds( x6 bzt

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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 byi 5utuf tq;v4 .:a)zrb what factor when the frequency is tripledbf5vti4:ua .uzr ;tq)?

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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 v8xsh* 9/rxapinductor is doubled, the inductive reactance o8s9h a x*v/rxpf 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 voltagez 3bt-m1 xad ,n(whl(v fk:cn; across an inductor approaches zero, the inductive khlx,faz v1(w: - t;3bdn(nmcreactance 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 a:u6 n(tuf7islzfc. (r*spnz9n AC power supply. In this circuit, the currenc((puu.snf:inz r7 6sz 9fl*tt

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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 bye7r p603n4 uwxje*ms3-c 6cdbvv3i8 1wbijei what factor when the frequency is triple6 3eeicb1e8wvp*63 jnjxv4w37iib r ds- cm0ud?

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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 dpie ge5(yv5c s0:y nknk kr( o.h9*:hAC voltage across a capacitor approaches zero, the capacitive rea(k59 ecpy:hghon :yvr k ds(*ni 0ek5.ctance 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 th+ngrx jx- xr,oeua hrb -x /;:kw6u,+oe voltages of the inductor and capacitor in a RLC series circu++obok-uxnxgr hjrwa;e, ,-x:6 u r/xit?

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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 circuut;jjvwko/yedu .z if3 2c*2(it is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The kf+:rz/b/gsue mgv*765tt ld g//mrp impedance of the circuit increases if R increases. Wk+tvfu *mrb/p67e md/ s/ zgr5g/lgt :hen is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The idl khuz6n5-o).3 udl jmpedance 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 circui4q8y6k0( k scexq xj8rt. 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 andf zqzsq; vl.-/dn7i 4t the capacitance both double in an LRC series circuit, the resonant frequency of that cir/ 4 t-sfi;vl .zqn7dqzcuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied volt:(sx k.r8gvx+qfpya. ,zr7- b xm3yxk age. 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 circuift-jwhgdnwih.0l 5 bk x8t4 l8n67m;et 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 r7bcoz4 zqr-.v *.hjidotating in a uniform magnetic field of 0.20 4.bz - zv.o h7jc*iqrdT. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uowrt t rf5btq( y4-v(tw2 6-bhniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fiy tofhwbb-5t2vr4t6 wt(- q(reld 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 rotating in a uniform magnetic field of aw(zs7gm w t0,0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an an0awzm(ts, wg7 gle 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 adjust*gves5j9,ct2 j( a tstable single 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 coil changes fvl4 r8jtv bvkxub: : to.08b:jrom $4.0 \times 10^{-5} \; Wb$ 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 ru/p tl5 hc8d2nnoeb x-x/ mw9n;u,1bframe with sides 18 cm. A uniform magnetic field is applied perpendicular to the p/nb 1p-2x td,rln h9wcm8bu xeo;u5n/lane 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 wi)/hpozy8cs 7:p*:ypi 1u vvq fth 15 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 and1-jphx(v6)xkv :keg bld5,49 af vhhp area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontal wisbeq 7b(0)*fu:zyn4yeg p+bk5 (h tly at a location where the downward component of the Earth's magnee wbn z(ysiy:kh5 0ubf g7btep(q)+4 *tic 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 bo nmsufd1 n n.nt)q:19ar that is 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about f :)91n ndot .n1qnsuma 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 loops and a cross-sectional area o b7vh5 5ff-jb6xc 9xvlkpz(z )f $0.25 \; m^{2}$. 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 g9:x0,g-wwqw c8 vx arof 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 8k.f+(fvza jpar 26np(0 rectangular 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 the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what wizfp(rp( naj+vakf.26 ll 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*e 47q g95o*b5sqhiwya eb h5o wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output ofg apfv6n* 1/yf 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. I gfva6 /pnfy1*f 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 generatorzyvu)j;1i b8u 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. 4neb edoa6n-cro8 p ou6ppq9 i v87f-9The 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 h3qf wsb9-h)0 21wy yld;wt wuhave a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a bsbqfh wl 92)1 -0yyw;u h3wtdwack $emf$ 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 resi2v ju(x ut(h7ke *+smmstance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the j *mh x7(vutmu( ek+2sstart-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power szyqmfexo6os7o71 /)f c7; abpg ph.5pupply. The operating current is 1.0 A at fu o cqhs;1m7 o pabf)75pfz6g x/y7poe.ll speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. txuo3-p *xbu g.-ho; c The operating current is 1.0 A at full speed. W. -g;ooh ut-cp*x3uxbhat 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 needf sx*x(m1h mxpl+2 :xfru*o;qed to reduce 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 causkv,-o8ebk/:ev f4vt oes 14 A to flow in the secondary. How many turns are in the seckt, 8vk4/ efo -ebvv:oondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, ho33-blpxbg z*kw many turns are necessary in a 110-V primary if the 24-V seconda*3x-bg kpl3 zbry 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 ax6 n7ljl k gkkc 3kb-4,:aiq4w 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the cukkl g ,4 xkj-k7nlc:a6i3qwb4 rrent 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 t9d7 02 4x lpcmk5;fpa9vpgwjdransformer. Assuming 100% efficiency, how many amps at 24 V can flow pxp54;wd9g0 a ck2dl97f vjpmin 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 t9wnh) c5 n j3te7xy/qmA. The primary coil oper3xe59)njhqt n ty7/wcates 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 pris.(ji x huic 4q00xpr2mary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present inh jui4q .02xsr0(xipc 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 hasdzzl/0l,fvw(k ,s dp1 60 turns on its primary coil and 300 turns on its second fk,dl,lpz zs0v1(w/ dary coil. If 120 V 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 tran (zhq+c0nmq*yy scz*+sformer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current yq+ z*qm(*c0+ h cysznat the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary hug(9p8/g2u c beyc c;has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltp;h/cy 8ecbu(ugc2 9 gage 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 secoy2qh,znd, z8:(q)hhw 4+ gflqsprvd. ndary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting friw pq(2f,.qs:hz,ddn hg r)z4 vql+h8yctional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steppejvo, l 4x7q vn4(w. gtvv:yzw-d up to 4500 V by a transfv-olv ,ywq jwgvz.x4n(7v t:4ormer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at o f.f1 pv;jv1 yutqaq; ;r4*qb120 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 in o;jfpv4;tq .q*ubyf1qar1 ;vthe 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 hdw eirn 3w-8eji 0hjmi6+ 7q(is usually stepped up to 4500 V by a transformer and transmitted through a power li-w6j iw8 m7e 0q(n iiej3hrd+hne 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 line 50 km long has a total resistance of 0.60 W. A gens/i /l/*q gal oo8ea2g,w6nqverator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the osw q2v/igq,o ga*a le8ln6//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 lon5:(: 9grr ppyl**tqbqqob.u jg has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy* qrqp bg ulot9:*rp.5b:j(q y 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 q84cnz4eh o2u be lost if the power were transmitted at 3000 V insteadcoe 2nq8 h4uz4 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 440jt,4 yxqgg-27hhy:r2q/ ig t4ql/:mn ffoqp0 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped uxy:h ph ,q ffg /igqq2-4tr4qgn jmo270t/ ly:p with 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 in the coior6lhnm1yhjo /+) 92axm nxl3l's maoro2x/lnm 9+m )l3hynx6hj 1 agnetic 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 1zpv(hl3pashfi 9(cd i3/b-t 68-H inductor. What is this circuit'hdfp(p z 6s iv/3ch9it(-b la3s time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms volo wk)*ir e1:7f6laelx ug/ 3hatage 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 peak curr z(5yqmt)m59r y/8y impw tl/gent?

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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 x9r nlkk21ls:uy ,ws7AC outlet. What is the resistance of the lamp?s rw7:k1 n,kl lx2suy9

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is(u a)2a4plwx m the peak current thx l um2aw4)p(arough the 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 powab3c8,my o v wrh8),moer supply. What is the power dissipate c3am8v,bym8hwoo, r)d 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 resistor pibc 89jcy8-xis $I = 0.80 \sin (240 t)$. 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 ior.+ bup2ri3 qs $I = 0.80 \sin (240 t)$. 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 roix96f4 a78 utork*z6 ;tr) dy ,gidhmesistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor ahui(yz*k/f; emqn7k) t 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 coil at 1000 hf.fwep6f 91 eHz?

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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 hav*j63eiqwfbueh / z5*ke 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W o)l;i*zn4 mo /zt2x-uvf) oyuef 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 inaod5c+ecna 25 a 60-mH inductor when 120 V AC at a frequency of 20 kHz is apple2o a55c na+cdied 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, 60.0 Hz sou:de ae5vo y82axc7au 4rce?

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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 r jju pw+clr/0 qv)2,ymr5ho5reactance 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 cap)8 usx;bn fd(7stb9isg4r j. qv0ocp0acitive 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 capacito ztt2+/7bk4dw he el44oau (lxr 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 yv x;px(ki 90vstt+x.be 100 Wxxk y9t+;v p0x (i.vts?

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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):)ecxjc:bew 10-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W rew:mgo rzh6f y.ar) j,+sistance, 15.0 W inductive reactance, and 10.0 W capacitia :z f rmyr6+jowh).,gve 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 rhz -m/0. egvbx ./ z-wdrtczv(esistor, 20-mH coil, and 1.0-mF zmz- . hzv/ew( drbx0/g.cv-t 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 1500 Hz if a 100-W resistor, 20-mH coil,h 2-2u5rehf lp and 1.0-mF cap2 ulehf5r-p2hacitor are 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 8: l0zuzpc 9yxqy0h+c/o n(aeis connected in series with a 20-mH inductor, what is the ioz9 c/hpc0xa8nuqel (y y:0z+mpedance at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected ire4n e cp/e r2)np2b- z*c3mlmn series with a 20-mH inductor, what is the phase angle at2eblrm4eez/rn p 3n-*m)c2 cp 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 coi*0(xekwh7 ht1 ln6i6 ae o(ital and 1.0-mF capacitor for a total impedance7h t1nw i*l6 t o0aaehe6((ikx of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitan3l raq gp63vc )5xor+-7 sklvkces is needed in series with a 100-W resistor and 15-mH coil to get a total impedav cra-vs 5r637l+)lkgq3o xkpnce 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 seriemoaw +f *i.jg4s with a 450-mH inductor at 5000 Hz for a total impedancg+*iao .wf4m je of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.0-MHz for a t/u+obbw3 yc xki .0e,botal impedancee3 ,boybx0ci.u+/bkw 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. What is the i ggo 3c,2ote,bmpedance at 1000 Hz ,o2c,bgtgeo3 ?

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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 ca0a/ mfjb4a.*4m tesa fpacitor at 1.0 kHz for a total impefta a4eb.*4ma 0 /msfjdance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a phade l +3t:b(rpkse ange:k3tr(lbd p +le 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 resistor at 1wx6 -xxm: z7bmcbq)u2.0 kHz for a total impecu) xmb:-qwx z6b72xmdance 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 (lq(x7a2oy6sq0t+ d cddf )ksHz. What is the phaseqd +( k ld2yq6d)tc0x(ssa7fo angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 18z( xnp-o pyo).0-mF capacitor are c( -on8po xyzp)onnected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-mF capacitor, a,giqxzw:r uoj o5*(1y0jak g*.am:kwnd a 0.350-H inductor. The circuit is connected to a 120o owj*g1xjkg,w ayakqum.i5 :zr( :0*-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 caph4 bkvs4 oddb.*9wz3 hacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W arekz93bobhhd .4 v*swd4 connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angl,qo +px:qn 1mae for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45 1xqp,mn:aq o+-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 5a)4ko*p2jn jr6wb:)i 4 elwon00-W resistor for a phase angle onna4j)i6op4r2l :kjb ew wo*)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-mHjpdv1 qfz56meg.,xbl. q) . od, C = 10.0 mF. At what frequency should fev, .dm bpq5z1g)j6x.oldq. the circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resist9 ;i(5yudje)k g1;y4wjefyp rance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V r4w9y fj j(1ykepe u5)iyd; ;gpower 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 circub4ppg+di4o,d:rq xrp 5 -q*ztof h80qkg4 /o hit 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 ajo-neu9z, n(l7a/c lec57hx resistance of 30 W. What is the power f-l nez jnuoc aealc(5h7 x9,/7actor?

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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 f9q, tbs3,xdr gor a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-dt9, 3brqxg, sH inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in series?fx0z862pu(afd ug5p d 2fdfg0 uup dx 85a(p6z

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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 fo6 r77/7eykb,zuunk ,nue niv/r a resonant frequency of 10 nb/u/ nunrkkz7yi7 6vu,7ee, 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-mH6y ahg ir+o):h5et/r ssl+u0,7 s jhw/ ugrh-m inductor for a resonant freqush6 r 5/sr/ayrj es0- ul:wh +i,tohmg+ )7hugency 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 with a 30-W resist xs2i)y.k rs1mor and a 40-mH coil if the resonant frequenckrs msi x2).1yy of the circuit is to be 1000 Hz?

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