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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 following4 rwjd 52nlxlkv5+k 2c are units 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 thewdjuhnydf z) -u/::iy 8xw/x5 $emf$ 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 of change o oxayyms3. 0dqpdkefw d4 l20+,i5 +hsn the infq5 sm+li e.+3dw,x oy yp2ddahk s040duced $emf$, 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 oark(ot 3h4dnasx 8 4+uf the magnetic field through a loop of wire produces what kisa3hu4n+ rok(4 x8ad tnd of change on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of 3bj(j)3goehwynyl9pm: f1 vmk22d . a change on the inducb29ny )hm331vk:m ljjeypw(2fgd. ao 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 fro8 1vbba+9c/yr4 fwd, 7eb jkzrm 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/dy r0 +bg1qk:4c ltek direction of an induced current in a conductor will be that which tends to produce which of the followitr0d/1ygq+4bl:ek k cng 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 glq;p6x xkv7cw9j s*-.kus it.pk a4- magnet is held above its center with its north pole pointing downkc l iw6.kx4--* p;puj.tvx7 k9gqass. 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 ixifd yi1y5mioy:*f8z9f5 q 8magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed 5f1q8zmfii x5o9 y*8yy:fdii 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 tab sy.7a0aj .tx( db2l; 2k,e;9 (bpuw xgwjsitble top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, w(i0jaeau7s.lxx29 . y2 j wg(wpt;sbdb,k;tbhat is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a levelp4,0v5k erkq,l+zma3 q,ct zt table top in a region where the magnetic field vector points straight upvp ,tlc3qk kar,+z mq4e, 5z0t. 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 tabdz.msd. 06yy1lo w qu7rqh1d,le 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 current in this coil qm dyuyzs,.rd.w 076 ld1hoq1 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 /tms g),5i5 c0cq pmcjand carries an ever-increasing current m5gmc5c/t,i )qjs0cp northward. Two coils of wire lie flat on the 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 north pole enterin: ewhzmm: i+9pc d +aw66 c+f1bwpp6epg first. As the north pole enters the wire, the induced current will be (as viewed from abov e:pem 6mpcc+f 6wbd:9w+h1z iwpa6p+e)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis i2;hc skj0,ds whose direction can be varied. In a region where a unifo;s, 0 sdki2jchrm magnetic field points 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 rotated at constan*- qr4:5 gkkc0ixuod o oe(v.jt angular speed about an axis whose direction can be varied. In a re-ic0ukoo(4ej :.d r v5xgk *qogion 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.lxb7 lvo3x) 5vd/3 bpv
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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 0-;zk8:qy 6z,veml1 -dmoch/nz ngym 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 amc,k w);e lr7m8l rry/ magnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oris9)nq nict;y9n v* thky0 ay/:ented in the east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a s9/tkynyh) *q n c;9stn0:yviatatement concerning the potential 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 rt 6. bstj)ncz2vg;we/ otates 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 transma7 efn/yctg6 .id8v,g5n(qfforms

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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.w2k7ax( qitowu0 skn:(8r5 fh The frequency of the xha8ti( rws0:w( 7 5fkqonku2$emf$ 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 use99 j:,x rspelhd 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 deviczevblsz/0 - *vc n.aypi5k:esb v51/:p (yytk e that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the prif3j9s.qjb2zk jb) jf3mary coil then it 3jkfb fjsbj jz.3)q 92is 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 contanlue * v- )g(xf5f6h3d,mg-chifctz 0 wy-g6lins more loops than the secondary coil then iccth5gwdi3-flyz-,6 x- 6f * n eg0m(h)vuflgt 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 1sxm t6: isi./d nn4uhnf9h+ dinput

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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 resonanyp*nsk;n;il (b u*eh:wqfu7c+ig ;) qt circuit,

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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 ideov1386 ellm s py76 ppdx epz2nme,e58al battery of constant terminal voltage. At the moment contact is 15ezxem3llpp d8pe68oe2 mp v7s,yn6made with the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are copt;+1cd h/gk annected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the inducapgd/h+k c;t 1tor 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 isnx1w*.7rye ol 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 induczx k5a/wt/rq5 tance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor ar+2 c i-d(xrcscqgum*3 e connected in series to a battery. The time constant for the circuit represents the time required for the currg+d u*-m cqr3c s2x(cient 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 inducto2 bd5iskvtfj; .0 mq2zr are connected in series to a battery. The battery is svi5zb2q m0tfd.2j;k s uddenly removed from the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units , bkt lahi-27ei;w0 eaexcept:

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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, 3)s7 6visoudx;m bgqw69g ez.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. In this circui9qfi+r1jkjby d4 b r56t, the currentb6dkyf9i5r1j 4 qj r+b

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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 cia1zdwk-ejq rn d8.a88 rcuit changes by what factor when the frequency ajz1ek 8ra .d-wnd q88is 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 AC voltnu;hkx5q0vei0 ua9qv* 4 cmp tvx 21f+age across an inductor is doubled, the inductive reactance of thav0pixma veh; u qv2xtnqkcf 5*1+40 u9t 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 ac,zet/(dud + 2o .mkxwxross an inductor approaches zero, the inductive2xk,(.+w x odedt /umz reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this c0o2juzau npo9h*aljt/-- )qso whp2 5ircuit, the current9qw a22 n-j-ou0ajpoz 5t*lo)u hps/h

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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 what facp0twk683 :prmf2,ogq)b bm x itor when the frequency is tripoq0 b3mxt8gb,mf k6p)pi2:wr led?

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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 acz2 0up)uulo j(ross a capacitor approaches zero, the capacitive reactance of that capacitoru)(j 0lu pu2zo

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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 capacitor luarlf zs fp5rtz+l h,w2 )2o.f) 1)ntin a RLC series circuit?sl.na1)l f,2tfz5z+ol2)tu )whf rp r

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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 ck*:jvh6 jgw)u 8wxja7ircuit 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 increasesltu)gp s2s; u .g,(q(yum8 (ykw snvw*. When is this statement tl(g *y.8u(s 2u tmy(kgpws qu)wn;sv,rue?

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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 th5p,nsj.:qf(c ;pndh/ j vw;r we circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increaon,vlv -:u(r f 4u)42qib hsrx:-jx lpses if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in mbh bb1ic( e svd/-.2l) zy5enan LRC series circuit, the resonant frequency of that circuit h)y2nz 1-.bd5e bscilbvm/(e 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 thrwz yz-8 pvhm l4c3,t3e/jk-iat is driven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs d6j v ++dnpv4czd 47viwhen

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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 0fj/wju m3ddu2gzl bk81vy: )is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop 3zk2y lu:vmd )w/gju fjdb810and 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 un.nx1o+ vcl 94ts5ans - ga/bxaiform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane ox4txa onbls.1 5g /cna9av+s-f 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 radiuvzb)o3v. gph5s 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and thz .o5 3hvpv)bge 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 adjuqbrvkva16la ()q 7.ggstable 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 coillwvgcbi/g)vqog; ey+ i(*00w 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+/p/v(u:fpl2n r4kbp0vnfy t 200 turns of wire on a square 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 the induced 4plkpy:(v u bntfrfv2 /+p0n/$emf$.

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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 wihw.0 k;ne/x ivq.qk8ysva:* o th 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 and o t*,x cj/e .6msl4nrnarea $0.20 \; m^{2}$ 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 at a lz 6 toh.j8;pr hb9hl,mocation where the downward componentrj .z6lm9ho, th8hb; p 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 long rotates at a constant angular velocitpl5mzg-u5+ u.; pzvhwy of 2.0 rad/s about a vertical axis through one of its ends while in a constant mag-umh.5; lpwgv+ upz5znetic 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 5ml/0y e4h lfparea 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 wire of area o hjgo9,t4f u8l c+h+n$0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Eactg-stixw.)t en3h :b8 f2q+oqkwk y86 h loop is 12 cm long and 8 cm wide. The armature rotates a8: xk) 2gkq 6twinhqfo3wty.8s b-+e tt 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 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 wir2p 8e3px+ lpwle 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 cons 7bp1gu9 du72wx(rkrntruct a simple AC generator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the n7bd1r7 (kwx gu 29ruprotating 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 generatoruawl;*:08ecy aedr *v 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.o:oi kzx)w*oao *7qqf (akf/0 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 resistance of 6.00 W. The motor operates q 5mibj50qjvi-u3k) 6voe s v/on 120 V AC, and when running at full speed it generates a q/ k)6 0vvm5jej- us3ivoqbi5back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suppb(o cum bcn(*zm8j1k/ly. The operating current is 1.0 A. What is the start(ukcobm m j(8 bz1c*/n-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 sup4oir6i;kh4+ixad hbh os+h .- ply. The opo+xihk-h;b4h64 iir.sda+ oherating current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is coi; kd16fpll7xf od3 k/nnected to a 24-V power supply. The operating current is 1.0 A at full speed. /lk 1xd7f;fl p kodi63 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 transformeruk70nj+qo6o w is needed 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 transug( 45 r qqm-+xi unvgq7) ,g;iunt7zqformer causes 14 A to flow in the secondary. How many turns(u)qmi rxn;4 qngv7u qut-q+iz7gg5 , 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 turf q)fea -qmaw, c:/x*nns are necessary in a 110-V primary if the 24-V secondary has 100 tuqff *-nq,) /cewm: axarns?

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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-x)he/y /d6(c/ ndrcsoturn secondary coi)/c dysco6x h(ne dr//l. If the current in the secondary is 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer.ja b/4 b s/a3gbshy0x1 Assuming 100% efficiency, how many amps at 24xb1/ s0/gbjsaa4h3by V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V at 10.0 mA. T p-sfx k(5o9vlhe primary coil operates on 120 V. What does t 5o9-x(sfvl pkhe 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 sec;*q on( b:6gxry5bg1tk2jlh oondary coil. If 120 V at 2.0 A is applied to the primo56g nbjl( qhb*o;g2t : yx1krary, 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 turns :b4hrva.bftl. ,pqn 9 on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current isfbpnt b. ,var4:l.9qh present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. If u *ryynfdv3 4ar8-hxa+g6vn/the input current at the primary is 100 A, we cauh4*vnrga fnv 6 3-d+/y y8rxan expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. If cm+tbrh lc-f e4o8.w4 the input voltage to the primary is 100 V, we can expect the output voltage of t 4tor+-4f8 cw.helbmche 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 1zts8d, r;st(el5k, rc kolb ,nox *,6x00 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect t,,bnr;koc8 (5 tkll*rxs,te,x6s ozdhe power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of curren5+h oi jlrwb8 1)cotgao6bq(9t at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in tholco 6 ht)r1+q 5 8ao9iwbbg(je 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 voltanhr/5 (ek -lr:xeust p 5n/t+cge is usually stepped up to 4500 V by a transformer and transmilp+ 5u/se :h-5nenck/trrx( ttted through a power line 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 ,iwdcy80 y0 9ehw lt;wat 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission c9,e00wyh 8lwt;iyd w 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 link q*4bqog/h-) pshq n*e 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer wp) * 4qqbk-oqg/*shnhere 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,c2nfv02rjzl km long has a total resistance of 0.60 W. A generator producel jvczn20,rf2s 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 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 zss4:tv ,6hc awo5se6 V. How much less power would be l, 6 : awhs4z6t5sesvocost if the power 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 2+xes( 8 hz;ykw0 A. It is to be transmitted on a line with resistancees8+;kyzw (x h 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 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 mn eveja-44t/l0* c.cvkdz)o9c/qrjfe ,k1riuch energy is stored in the coil'9re ,cled rtf*j -) vzeik/cq440aco .k1vn j/s magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor and an 18-H inductor9xfeqsr+olufrx 9+fs5 x10h 7. What is this circuit'+x 509ff19er sfqs 7uxrh+ox ls 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 voltagwy 0t8us p( dbzpkkn* 8bu+d phq(4x/lt6 /e5je 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 qm)7wfopc wp3/ .rg+zpeak current?

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98#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. q0q :tc3vcp,sf( ucx ; qcz0-y What is the resistance of the lamq;c-,qcypx f00qu: s3(zt c cvp?

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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. Wha+8 .tsxh+dqmd (c(dzft is the peak current through the resisf(zxsdd+d hqm .(c+t8 tor?

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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 connectedf0 6ie:l5l* uody( mf,dk8deg to a 120-V ac power supply. What is the power dissipated in the 8eo(y,l5d k dfmig6:ld0*ufe 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 resihwspptqxm; ;; * f(xk,stor 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 m v5z, noz,gskmx4 k846w.fi-csrra:a 50-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resdnv5*i f +4vezistor 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 3nr r,uwu 4-pkat 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 inductivwsg t d9303sqee reactance of 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 havk;1kgq, 3trwd e 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 e,8mwsmhxk)4 k5 9gf: ysp n:yW of inductive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of u4xeg p 5gjg m0ntcu9j+,ns/s8s8 gz,d43 ktl20 kHz is appln4 4gsx5 ug,szledsk0 m3 /n jtpcg9g8 ,+8utjied 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 throughiezhyi/ e)w4u/ smm p2wb;v0: 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 4.7-mF capacitor at9ydw)wa ; bsb4um 7m+m 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+3+)zs: s3dzpdvx eoxw2ssa 8 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 143jyrdz0sbn 8 0-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 2em0 l:a-abazthe capacitive reactance of a 0.010-mF capacitor be 100 W?:lb02amez aa-

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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 0.0010-mF capacitorjhm7; g 2lylj1 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 n/aw b +3izg5eq6,tun circuit with 12.0 W resistance, 15.0 W induca gnwit5u/n zb6e,3+q tive 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 resiqo /xwbn; ,fb(stor, 20-mH coil, and 1.0-mF capacitor are connected inbf q;/(nx bwo, 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, ank4 wt; kgsjkpo3 z2qtc,e/) u0d 1.0-mF capacito wz s02qtoj ktgpk ku4)/c3e;,r 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 is connected ic 1z fes;l8) yhr6 v+ok;swa:-nekes(n series with a 20-mH inductor, what is the ic;:ss1 v+a6k8ef (;reow l-k )henszympedance 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 qy2dv* 9qh lrj py;:j)with a 20-mH inductor, what is the phase angle at ;qyv2p*jjd) h9:qlry 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 neqe25+mxa cwl,u,b 1hheded in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1500 Hzc,+e,1xum2lb5h ha w q?

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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 a 100-W resia 7uomp0z ( +h6zjzit u8rpaibj n5;64stor and 15-mH coil to get a total impedance of 110 W8;7ib a6i uz0zj nzohp6ru54( ajtmp + 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-mH inductono j, wvn68k;or at 5000 Hz for a total impedance of 40 n,j8n6w oovk;000 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 1.9q ( memnsl)vzh29g r50-MHz for a total impedanch9l zn)2r5s 9q(mgemve 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 capacf coky;jedl:h4m. 85o itor. What is the impedance 4j ofhk8.;moc eld5: yat 1000 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 seri: -59lu/w5oynsc.gs qftci z 4es with a 10-mF capacitor at 1.0 kHz for a total-s uic/:tf snc9qz5yg5lo w.4 impedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacr -9;sy dewwm+*.f;ymlb7o vgitor at 1.0 kHz for a phase anglsld;*7 w9.w-vy+mm bogye;fr e 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 neede3 x(xf 83cnxqxt 2wgk ub)h-7od in series with a 30-W resistor at 1.0 kHz for a total imp qcf hxxt7-3o3(wxk28b )nxugedance 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 1xoisvjp rro53(qrb4o6p * ( nseries with a 100-mF capacitor at 120 Hz. What is the phase an5 (3s1( 6bopr4p *nvroxqjio rgle?

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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-mHt(1y/uqn6ume82e ntg coil, and 1.0-mF capacitor are c uu 6qnette1yg28mn(/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 9.jqfcvt, dsckr(c viz864v. of a 100-W resistor, a 10.0-mF capacitor, and a 0.350 q9skczj8.4vt ficcr, .6 (vdv-H inductor. 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 capacitive reactance h x:v4 fhk.bwbd ke(6,30 W, and an inductor of inductive reactance v4hb:( wk ke6.dx hbf,30 W are 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 angle for a series RLC circuit -puo i5vja/:wvf s1:gcontaining a 50-W resistor, a 10-:/gas v fui5jo1wp:-vmF capacitor, 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 neceazym v5-m-9j 3v-g jysvs -e7,pfn7rt ssary in series with a 500-W resistor for a phase angle ov ejjs tp-m7- zmvafr 3,-nvy7ys9g-5f $40^{\circ}$ 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 = 20o l)x ;oo9apz :obmouh9n*+ k0.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred from the dri olko9ho 9p0u+obao) z*:mx n;ving 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 seriexu1 l(/ojtq4 u4 ;rlvbs circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactan(j/rlo4x u;v14 tl bquce, when the circuit 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+j7w5i f pq;wvued1)m AC 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 mx3h,+jt ,2 :e 2iiw0nlbcqkoan impedance of 60 W and a resistance of 30 W. What is the power facto o2il,3bicj+,x :qte kmwn0h2r?

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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 txea0ff bb0z/h /0+jcwqb0 f9for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, 00qxbhaetcfz 0ff9w /+/b 0jb 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 frequenc9y 1e)oqd wvj8r g*q+vy of a 1.0-mF capacitor and a 15-mH coil in series?)*j+drwy8 ev9qovq g1

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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 vu3t5i6k5 wk1k* s9ezo1/i;f1wjltguhzkv .4.7-mF capacitor for a resonant frequency ov5u3ti 6jo h11*u.k5/91vg zfkekswz w t;ikl f 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH m)g, )qumkaw3inductor for a resonant frequencum3k ),amq )gwy 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 place-sa jz4 z w9ibzbygd;t95*.iv d in series with a 30-W resistor and a 40-mH coil if the resonant frequzwbzv9idis z y b;4t-9ajg.*5ency of the circuit is to be 1000 Hz?

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