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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 unit 63)p4 xpb51fxzj sz:z i0dj++yipvxw8zf*svs 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 th lh-7bm g cyf+5eb)+30r9rae0sjxfrme $emf$ 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 producesz:um.lub mxk8f (r-(e what kind of change on thekbem-f( : 8.(r luzmxu 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 ug1vp4sghch)p+ py/dx2 -w:nof the magnetic field through a loop of wire produces what kind of change on the hxgpp-)y :sd/2 uwvc1+h 4n gpinduced $emf$, 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 os-275, lhr hrkvsdd i2 gfvj7:f change on the induced-h:f2gvv 72s, hr7sdj r5dik l $emf$, 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 f (h1tw vjp(wssu30d q.rom 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 idl6( gwl e:grl*6la4unduced current in a conductor will be that which tends to produce which of the following ef6*l4wl ga( d:g r6ulelfects?

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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 +iu)c ;xv 7cdlflat on a horizontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when vlu cdxc+;i 7)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 j) + au*-h-0gfxdy boeon a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released.aby+ ho -d-0jufe*xg) 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 reg55i g8gsjdqnb+9mjk8( yt(fj ion where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the s(i t nmk(b85d 8s gqjfgj9y+j5ense 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 0yfwljuvg24sg 0 6k5cso16a b level table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the digj5sasc fvkby l640go 601uw2rection 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 tab:*jcm8+zbau,th*qp* l y v7 zbb) )cgble top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed:qvyhl*,bzb pc*g7m)b)bzu a8c+ t*j 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 horizonbd1wwa bvdm ,h;)1 gw;/i4h yttal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed d )y,h ;w b1b1at4wwg/;idv hmfrom 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 through5 v 3kwepf1 ege:l3 8k/*hvzyo a loop of wire with the north pole entering first. As the north pole p*z k ovgewvh5fl/ek 3:y81e3enters the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about anjxc(0lsv h56*ljrtd7 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 ro0v5 ld s7*(lrtj6jhxc tation 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 rocvw oar -xywh/97 xwrt a/4y(l+hl :(qtated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight /(( ww7oyr/wql rhxa9tc val:+4h-y xdown, 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.3+ 8fqwf4)cg *ueob xt
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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 o. j5/klnyw2-lzxl b. u 31rnvan $emf$ 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 magne au q5cvbae,u*x592: wgrem 7mtic 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) uep)z7;c (r 0eg. kdqcis moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potentia(cz7dg;e0. uekpcq r)l 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 blzfnmpa.xgx4tt .j1u y c00 :5oi+:r kar rotates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transf1 :0mp6hxxacodl;4 yworms

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotate(88wz ;erbn*to h ga ugc8m0 :h-fw2azs through 60 revolutions each second. The frequency of th2-zo(g ge zbw; *h:wt hfn u08amcar88e $emf$ 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 use4 )qt8rnvkdp 2d 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 t x u7k9,w3fmmy vpyjt+0s) v*hhat

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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 co (e5vefu l25lbntains more loops than the primary coil then(u5lb52evl fe 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 f;v7i f.qt bcc rgxc(1*sx/8ythe secondary coil then it ic rcx8 ( i;fc.7v/ *1xbfgtsyqs 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 nffncyl- )ml pn,,-x k2l0b+t power 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 circkr-lfz62 6a mduit,

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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 iden -rg8+nq i4gn3o+ljown-1dral battery of constant terminal voltage. At the moment contact is made with the battery,wngqjgrin4 -r3dn n 8+ +l-oo1 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 inductorvcrr vqt (+1*db e1b:r are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with t be rb+vc *qrv(:drt11he 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 inductance L mj .l5zlcuh8o4gww *9 zrl0*v and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistanlenl,3 :wu 8sxce 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 i8+ jkvc0f8 ,vliu(unbafi +l.06ig yhn series to a battery. The time constant for theab 0luni8ulycjv,6fifi+h.0+( kg v8 circuit represents the time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor a+ch + . z2he0u+ncyhqrre connected in series to a battery. The battery is suddenly removed from the circuit. The time consu2cn+hhz0+hcry +.eq tant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have sj4eu4e 3wvq v;pr;n0k+7 cqtthe 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+uf g+ ft1bl0c 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 suppc*/nbp-2u au0g6+(hxw5cafdmg (x an ly. In this circuit, the currennmh a2g cbpdf g+ u*6(0/wa5nx-cxau(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 c;2ril(lma ;xq hanges by what factor when the frequencyxml2 l;(;ri qa is tripled?

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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 ACppv,t1s:s( jzm-.n g v voltage across an inductor is doubled, the inductive reactance of vp pj.z:nv( s1gs-,tmthat 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 inducto2y5f ,9y229aw2s -yvbz5 brjrstrdl ir approaches zero, the inductive reactance of that coi5a2dyb-f,brl2 v9r9 t5j2 yws zyisr2l

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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 4xlghz hca;-9w9+x;q eo i5fn power supply. In this circuit, the curre- x+4a g;i;5zl9xenq 9chhfo wnt

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reacta w.dnz. 2 t/jsn/vdtt1nce in an ac circuit changes by what factor when the frequend j2ndznstv /t.wt1. /cy is 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 vol:qt2u,qb+d . yvw-dz xtage across a capacitor approaches zero, the capacitive reactance of that cyq+2z-ud, w: .xqtb dvapacitor

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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 the inductor and capac7 qfov(1. enouvv6c w5q4lg;1pgzj(xitor in a RLC vgeo .lx v ;qn1f1u4oj 6w7q p5gzcv((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 +tq bhgiz; f0s aw w336vhr09han RLC circuit 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 impedance of the circuit increases if R pbskr 6xeco/e-:6benl; *sb;increases. Whexlbk/66:sbee - ;s oebc; n*prn is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circebv9vfgb: g0 gv;mq1, fs2 gx*uit 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. T67 yzd;uyfht6he impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitnhhupt19 ikvknl3k4t.7 - m0oance both double in an LRC series circuit, the resonant frequ1p 0 nt9nlho kh.v4-km t7ki3uency of that 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 circuit that is driven by an AC 5yx 9bxwxj31nztl 0)k 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 +qtn83 lq )f5e/akdzn aqwz-+ circuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fielf z+net9f- u(tk.uh hfb/w2;sd of 0.20 T. Find the magnetic flux through the loop when the plane .9kntbzsu h+ 2-t wfuff ;/h(eof 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 kjea7mdj+x+96/ 0yk u v cn2mym is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the planev2unkj a ey /+jxdm k9m0+76yc 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 rotatrkq0 ej(d2gmddy fm-*up5l((ing in a uniform magnetic field of 0.20 T. Find the magne0- mdukfly2d(g d( rqpjm(e 5*tic 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 single loop is redp*4+ oi0hxmo*x) x0,g-na w ntck p5jyuced 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 taf9w/ gcip 9tx7o6o9changes 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 of38grbqch3 qzzr83 ak5 wire on a square frame with sides 18 cm. A uniform magnetic field is a rz53g 8khab3 qc8qzr3pplied 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 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 turns and anyy8t(nr.q 0 qk 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 area nfybk76t0g +r2/i2n xzrgyg3 ob, lj+ $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wing span of 60 m flies horizontally au4mjqi2c -3f v1ya j4vt a location where the doc4fj ujmv3v-i1y 2qa 4wnward component of 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 lon ( z/5iasb,xwfpo f/,ag rotates at a constant angular velocity of 2.0 rad/s about a ver 5,aps/zwf,b(ifxa/o tical 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 cri+v;rvd6ft f6 oss-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wirutp/cl*5 vdz* vd7er9o. lx* oe 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 *1 pwk4ugwwn.- jl 2hxloops 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 longp wujn.lg1h*wxw k24- 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 generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of(bc:e)jn 0k,c3jucm a 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 any3n4im(iszvaj5 9 np ( output of 12 V maximum when rotated at izvnn3ps( 5m ji(49ya60 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 a maxif 73tl 3htd7wwmum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. The motor95sm vqm v.x+e 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 resis1:( fg:w,ou,w o w ebxq33jxiktance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates q3w,(3g 1k ijof:,xwxuwe:boa 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 connect) lhrosa8 i)z)ed to a 24-V power supply. The operating current isz))saoil r8)h 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 connectkv 3xudn9r*r6 ed to a 24-V power supply. The operating currexdu9*r36v nkr nt is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suppz,w/a x .w0h p3rsw+n 41tizcyly. The operating current is 1.0 A at full spe+3xw0/t asr.wyzc1iz hw ,n p4ed. 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 rejw.2*di1(6sq po c3oyzmcct9duce 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 causacnoa78 h7jnb i4sk d353p p4xes 14 A to flow in the secondary. How many turns are 4s j3b xk7p h7aanpd3n ci5o48in 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+swf/z f(wv9 op6yc h/f gi)y5 turns are necessary in a 110-V primary if the 24-V secondary has 100 tu) fpgoyw 6sw h+/f(f 9v/5icyzrns?

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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-tun)/ wpm axg)6lrn secondary coil. If the current in the secondary is 3.0 A, what is the current in the prim )m)lwg6xp na/ary?

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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 primkogr 1tp .xg ;rw8n;;dfd0fy36uyb ( iary of a transformer. Assuming 100% efficiency,db x3dfg.yoy06;n81 ;gwupr ; tifk( r how many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of aqxx o d)g:tmi i(q1araz3*8fsr:sc (- neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120) c1tqmr:z-gxsr8(od(aiisfx aq: 3* V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on its s5 547la mgylgl:uz xb.4k 2zqxecondary coil. If 120 V at 2.0 A is applied to the primary, what voltag2q4bk5l4gz m ux .:7glaxz5 lye 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 turns orxt 2h++ip 3ugn its secondary coil.hgru+ +x t32ip 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 transformer haoy8wrlq87ectu:4 8 fy s 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output:q48cof yt8 urweyl 78 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 transformer has 100 turns andv f )bg/,// wirxqax;p0s1rzt its secondary has 200 turns. If the input voltage to r/ zg; 1,/ bxp0qvit/rxfas)wthe 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 hanoy*0 3lonw. e4 xln6gs 100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of then wg6.lo4noe03xln* y 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. T ft1)k2ev xzf5hg-(dp he voltage is usually stepped up to 4500 V by a pfe (1vhg2 k5 t)x-zfdtransformer 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 120 V. The voltage is usually steppedle*+y2ls l ct, up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost i s2cle,l+l*yt n 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 currt e/c0x(qf9 fcent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and tcq0e9cf/ txf( ransmitted 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 line 50 km long has a tr1 . vtreurqi:s,d9 4dotal 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.rd. t,9qi rsuve1rd:4 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 W. A gener,bdv/8p7x-j lcc5u/gam b3 ee 4g8x(d0raii cator 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:xi/ebbvm- / (7 3dj0p5 i8 aadle ggccuc4xr8,1. 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 34ojtfrm 0oo1,uetu *s1kfyz;r 6xx81000 V. How much less power would be lost if the po rft40s8;jot6ruke*1xo3,1ymzo fxuwer were 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 transmg+j8ppqw,f b 4itted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the originapq 48j+pgfw, bl 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 Ag)3ci.lp wv(n. How much energy is stored in the coil's mac.nw vlig3p )(gnetic 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 an7 .r-p/td,p pav8yooj5vi, o-l3 jrcj 18-H inductor. What is this cirpy cj- p37 rlvi/do-o,tp8r o v5j.,ajcuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC cir(6bkgxttzh95,azel 2cuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V ACv7k ehn)cfrtfo6:u)ka2+ ygp4nrx73o s 9 *ge 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 A9d)oj69 joq ms;vj,yoC outlet. What is the resistance of the lam oojjo;j,6mydsq99 ) vp?

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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 i 9mg6fmlrmx(c( s/k:zs the peak current through the resiz/xkgr9(ms6m: c(f lmstor?

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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-t .- oz7sk0vcbV ac power supply. What is the power dissipated in the resi0ocz 7b-.kvt sstor?

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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 resisto+xhwu ,cv(1 f mqb66m,ju8 glwr 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 resisg h63z * iwgvz-5(ij2lafng7u tor 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 d;s(i(g(vbwgp)7w vb 50-W resistor is $I = 0.80 \sin (240 t)$. How much power on average is dissipated in the resistor?

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104#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the reactance of a 1.0-mH inductor at 60 Hzv,dtp 8u;j*z vb.a3vn?

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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 3e:p hj-i6agw*x q)rfHz?

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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 inductivuxf:0o0h * rhd7neu j/e 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 inductive reactance at, vu) 2sq7ciidrru :giv)wy71 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency ojsx6:yj b5,9dh nt,rg f 20 kHz is apygsh5 :6b,9tnrx , jjdplied 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 :l yzu 5jbmj/.through a 2.50-mH coil 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 4.7v q1n,z.v h-n* )tqxnv-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10 kHz?hqyp-0; ho mx.5wydn(

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a 5vb8g z)9x kyxqdq*/zreactance 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 cap.kiukkcn q33o/1m(io eu,r:cz .e(x macitor be 100 W?.cm1m., eozqkkikux( n(u:i/ ro3c3e

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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 4z+a2d 4jqo 7lg,dkta0.0010-mF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit wit7 6yvcena4f agwuf9 9 h+k,)nlh 12.0 W resistance, 15.0 W inductive reactance, and ca nhyfv)n +9ukw, 9le g6fa4710.0 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 impedatec5zz ,m 7m t9 x((ue74jmkrct)sl k9nce at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacit 4z)kk 9srtm,9xjml7z ut(5(etce7 mcor 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:6h ytfihkg 78ho)n-o resistor, 20-mH coil, and 1.0-mF capacitor ar -hoi 7)y8ho: fn6htgke connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with lcgbxn9(0 a.lse0 3awa 20-mH inductor, what is the ibgl09xan c3ae0s.(lw 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 in series with a 20-m/6 bbme5,szt kH inductor, what is the phase angle at 1000zt mb s5be,6/k Hz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-mH coil and 1.0-mF capavcjfe6mca y,.puc 125 citor for a6cc 5mya f.1up2 vcj,e total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with)p7u rc 4b0q*55xm8ut0vd cx-jk:i aryq9nss a 100-W resistor and 15-mH coil to get a total impedance of 1yxsxu54uik rb8a-0rqm5c c j7 9 qvns0p:*) dt10 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 sb (gotu/vpy:; eries with a 450-mH inductor at 5000 Hz for a total impedance of 400g: byov/u; p(t00 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 t755m8 kxba4pv frpx4k ul,w6be put in series with a 100-kW resistor at 1.0-MHz for a total impepf5kp4u 4m76 k ,lbvx5xra wt8dance 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 k. vu1y xm6uw))b mbf)g-nbp-is the impedance at 1000u)umbfnwgbp-1kb- xm )). v6y 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 seriesm2fe-rhe n/m b f33eo2 with a 10-mF capacitor at 1.0 kHz for a total impedance of 45 W?32nfmher-/bo2 mfe3 e

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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 capa5c g8)ndv4 rgu(,rifo2yjk .ncitor at 1.0 kHz for a phase angle ofrrjdg k(ny,i24 fog.)vnu8c5 $40^{\circ}$?

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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 3n1z:f2(.5wnckyyrfd 1 g4tnn 0-W resistor at 1.0 kHz for a total impedance of 4n5wkr.fy42n( ngf1dy c:nz1t5 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 capacittt*v(i uie2;nu yks.1x(v s *oor at 120 Hz. What is the phase s(*(ei it*n 1 vtk2 osux;uvy.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 wa)yj4/6bwlj 3cn 3tfa 100-W resistor, 20-mH coil, and 1.0-mF capac4a w)nfc/ bl3jyt6w 3jitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of 5kzi0pyf1 8jkt9x4 rlxwz z/. a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inzr1xtwxyz4k j9z08pi/5f .k lductor. 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 capacitiver1qj qgbc + 4j19ysh2k reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source.qqbjjcg+219k 1ys rh4 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 an1k n/rzt t;,.rbidiuuk (u, )zerv8i 0gle for a series RLC circuit containing a 50-W resistor, a 10-mF capacitr,8(/ut ivb,n k z 0r ruz1ik;die).utor, 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 s8cbx s81 c2udieries with a 500-W resistor for a phase angle ousi8cdx8 c1b2f $40^{\circ}$ 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 h*o0ohy1x0,md *;db cc v( b-i9w8 pdrjkdhbs7as R = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven ind d0 obd o 1wirxv8;ms9*7c byhbjh,-(0k p*dc 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 resistance, 15.0pry(6 gig6y5y W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V powpyyg5i 6ryg(6er 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 Af,h:a0-5 vyl 5meyron C circuit 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 ofka0lx-qks31dkac9 yj6 *ex v; 60 W and a resistance of 30 W. What is the powe k;avk x1als6yk3x-*09 d cejqr factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containing a 50-W rex;wrn7* 0vg(o 6 f:-hmn u.r/bcht oyxsistor, a 10-mF capacitor, and a 0.45-H ind rt0f*nx 6ouo (xyh h.c/wv;b mgn-r:7uctor, 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,tcc7j svbgp 4jf2r+ 1 15-mH coil in series? pjgr1v,72stc fcb4j+

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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 sersrtda)bdca1/ 4zv ,f) ies with a 4.7-mF capacitor for a resonant frequency of 10 kH,abzrd4tf1vc /))ad s z?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a r6:,hri)0mi1i:w x kdchct 0fresonant frequency c0dw ikix0)6 :f cm,1ihr r:thof 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 resistor and asu2 kd7otgxz0 ,8hk2gw3 v d)c 40-mH coil if the resonant frequency of the circuit is tosg )7 d2 tu3dzk2kvgxh w8c0,o be 1000 Hz?

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