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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 magneti xv6pqsllg0 z. 3e.5crc 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 the es3,tszes ; 3b$emf$ 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 4v)o)hj-ii u6(ev2g7sl x qy fwhat kind of change on the induced 762 iq g uevf )lj-4h(soi)yxv$emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop dcm 90m jq1i;t dri/-kof wire produces what kind oi-i0 j9/;m rmdqdtk1cf 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 whb 4/qe.q setd*.1jwmjei7/ uy at kind of change on the induced * qe/mjj1 u7. 4be/w.qdse tiy$emf$, 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 fro rixq2nu8 d9 yp/9t r,:yrps+inqwmx vob+9 91m 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, thx++c(y /bjpc ce direction of an induced current in a conductor will be that which tends to produbpyccj+x(c+ /ce 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 horizojita+ffx tj 1 2n(x36ontal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet io njxfx1t+f62ai3t( jnduces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above i b,0tqwbif6p 4ts center with its north pole pointing down, and rewi 0,p4btq f6bleased. 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 majlsma;k ,bc 0q 47ky8lgnetic field vector points straight up. The magnetic field vani;0ylqkck,jsl 8a74bmshes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in ot 11sdmubl6-z/0ei sa region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in s-l11zie / 06umbtosdthis 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 regw-rax+ vbz(6m z**o0jn4q h efion where the magnetic field points straight down. The magnetic field disappears suddenly. When vn-xr4eh a0*qzfw m(b6 +*ozj 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 carries 3-6umby st 0oatm;-g xan ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of -3us aox t-mm 6gbyt;0the 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 entering first. Aog8w 2w.av 4tps the north pole enters the wire, the induced current will be (as viewed f2w v.oga84 pwtrom 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 cor r.qp, -ilzb:x d1r*vnstant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straightb 1irv- ,rlq* .pzd:rx 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 a6h*x 6 fd 1yin1oco3agt constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight do oa3dh1 6go6xncfy1*i wn, 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.gm8x dbdpg- 90
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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 z/9hnhkindnq7dh 8 q( ;-vgt0br 9fa0an $emf$ 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 magnetic fiv7/lrv8 m;c dgfu4y iq.ou8; leld. 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) is moved northwat*dk +5*dwmzt r;ow.g a cj7.ird at constant velocity through a magnetic field that points straight down. Make a statemt7r ;kw.+wj* m 5tocdgz.da* ient 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 rotates at a constahl8v g r++cy8:i+f cdznt 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 transfor - dpqp2oca+g6 m+8z5(ovqlq ams

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotates through 60 revolutions each second. The frequen/s k)yx.--b.wcmeh opc:o(c . zxve o4cy of the wm/(. e.yehkcb s.o-xxcop 4vo-zc):$emf$ 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 deviems9;xx q4i-eodzqge h.96, mce used 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 defck3((rt m t; f h9m )c5daymq(xc*b4avice 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 pri1md+3l(h a,n qzsc r1ymary coil thecqs+nyra3l md( z1h,1n 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 pri ;u:,8px-ju)z pjez ma ,mr.irmary coil contains more loops than the secondary coil then it is a;zr. ez uxjjppm8)i: au-rm,,

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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 bfd,( 44s.nf,xgb n rpinput

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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 resonanj dvwl 5z.,9xqfbsed9o1e obn if37; 7t 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 ideisi9*mu/0 a glal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage acium/ia0* ls9 gross 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 cpw/zsziz . .a.g-a.bz onnected in series to an ideal battery of constant terminal voltpz-siw.zg. / a.zbza.age. At the moment contact is made with the battery, the voltage across the inductor is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with induw de) f,p9 uu;ft:mhd.ctance L and resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is coqtdk9 rj.ov* o9fpx 4f6d7/vz nnected 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 t1miw5qiw.2,v f)xt+mi04: uirqz t( z9 tsgqt o a battery. The time constant for the circuit represents the tim5t:qit19zit0qg (,w wt.+ 4uxmi zfmr) s2ivq e 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 are connected in series to a battep,6zm k trrjw89v vl o*qt. i-l99r.ygry. The battery is suddenly removed r jgml9w9rk.,*i qvl p6. ov z-rtyt89from 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 unit d)+jxv8tfv7+s j4 cqqs except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to a6 b6 frtxsqog(ng0 *n.n 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. In this circuit, t9wzwn /kx w1p+ vvt6s5he currenps69+w5wvn1 v / xtzkwt

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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 b*htqdx* l xk y;9c.rw/y what factor when the frequency is tripled? 9tcr q ylw/x;h.d*xk*

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the indg*y(4 .jvgbz7 vp jrbj5yq qt0,rrf22uctive reactance of that indujyqj0ytv r2g g(r7j2 b5.4b ,vfrqp* zctor

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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 .syu*i6ywu d 1across an inductor approaches zero, the inductive reactance of tha6y* iy1suw.dut 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 5utvcn4v(o eg xh29 e4bik4d5 connected to an AC power supply. In this circuit, the current9ontv2be h(k cgi54vu4d ex45

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance i ovm -12p+aw5 fia:(n2 i1yhi pvpfnu(n an ac circuit changes by what factor when the frequency is tripleia+ fvnopv-mupf11y h25 p a(i:nwi2(d?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacito )19xoo:c pmcbiys,d-c6s ll2r approaches zero, the capacitiveoo1xl-i 9:2 cpl,cc6m sbd)sy reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor and capacitorlfy/l kh/5h m-rz2-1dm 1 kg;fwfsq7w in a RLC series circuisl 2;y wd 5-hqf1f/1-khf7wlzkrmgm /t?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is deflq o-. 7ux0cvj/ju-ncined 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 im4.wbk4y : ql6pi;xhzry b ,4zppedance of the circuit increases if R increases. When is this statement trueb l4byx,zh4i:kq.r6 ppy4;w z?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circ)5 74 o+wibcddr08*n6 yhfhy (aexuhjuit. The impedance of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circuit increas7ek dhys 3o2w+es 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 b2h2ee *5prdh-e:4 ugt g36vrnmp h7bcapacitance both double in an LRC series circuit, the resonant frequencype2 re3prhebd7-g 2t m un*564:vbhgh 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 applied voltage. At res:f-y.d1am t kh v,.bcz+ mmhs8onance,

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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 occu fbyzjf8;47 ym1 rs0 w4-shuvjs)f,gkrs 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 fieldues/ h2u4 b.wx*eo u3jd)6wmi of 0.20 T. Find the magnetic flux through the loop when the plane of u* wxu6u) e4deio shw.j3/2bmthe 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 uniform 8kov 35xqn0w* 2umsk kmagnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicul*5o0 uk v2qnm sx83kkwar.

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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 fic+4h-q*n s t0xcwjj2p eld of 0.20 T. Find the magneti0-wjc nc2s jxhtq4p+*c 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 ia *v7u j)ca7nba4v*yws 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 chang2j9k(rdbc2yg.qkqv 5ok ) b)xes from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a square frame with sides 18 cm.w;6kp:i.2p fq 6clhx qv,z7ym 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, findp6lvz: 26kyqf7h ,p.x;qmwi c 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 tu1 p1z /pghf1)xhm q/ezrns 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 andf sn7av97-jyk 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 horizontally at a)jrui zh t846e location where the downward compohr z jue46i)t8nent 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 veo34 zgc l,y4fbpe s0h+locity p scefyo0b34 ,4lgzh +of 2.0 rad/s about a 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 vmegfi)-q2zd y,bs 23and a cross-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 oow dts)k)s ;vr7.5zshhlav ;) f 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rv) aw*l 0xn7cy;r nq5xectangular 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 will be t;5 )lavr7xwqxny n0*c he 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 ofte ( k4 7dl9 uwdqm)fsc g4,41x bry;vcjmzb:8 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC u n .w5oo7ms o:ac-5gpgenerator with an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area 5anm o-7wc5supg: o o.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 generatordrt5gt1l 6csam+4e3zc+ mj* l 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.t b 1qj/9gza+slk htd +.6szl100 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. gcb kg:*,zox4uas.zzmou 50 9 The motor operates on 120 V AC, and wheo*zs. m u9bo x:,kazu cg054zgn running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to i(qdb 0uq)gr1a 24-V power supply. The operating current is 1.0 A. What is thed)g1( uqri b0q start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power ss a++.brka1s 80 mv/80 bhkbugt*chyt.iy(ybupply. The operating current is 1.0 A at full a0y1rc btbk0k8/yutsai h.yb.+ s(h *8m+gv bspeed. 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 su p/ ya:;z9ug4vhal4d3b m0fet2c ulwi98ok p)pply. The operating current is 1y:m bh 8)ei2p4v g opc9da4u/;kzf9u0lt3a wl.0 A at full speed. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is neede*fzz53bc3gx bdo 3r/fbu/7m z d 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 causes 14 A to flow in thd,ffteuo5bambc)l a de* * )18e secondary. How many turf1a cdam )fd*be)85 obl,ue*t ns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110fvo02 ;:e8b f w2wystq-V primary if the 24-V secondary has 100 tu :fowe tbs0f;v2 qy8w2rns?

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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-turn s of )c3s7z1tslecondary coil. If the current in the secondary is 3.0 A, what is the 7ot )zfcs1 l3scurrent 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. Assuming 100% u o7t3k on1;vygia+,v efficiency, how many amps at 24 V can flow in the se7invo3a1uk vt+g, ;o ycondary?

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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 750anep ch(kpq+3 -vnm0y g:.fhg4jp: )r 0 V at 10.0 mA. The primary coil operap -pyfjm pqh0ahg ( e+kn:4):gcv.3nr tes 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 its2ilq*h78 t /t38-berkg whu bb primary coil and 300 turns on its secondary coil. 2t-e w8qtklh/7*r bgb38 uibhIf 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 t/5 .jwt8:fs4q r00h+yo fgxl gr:yl yuurns on its primary coil and 300 turns on its secondary coil. If 120 sqhwr+rj 0tx.ll f /foyg5y gu:y0 4:8V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary hahpizl4.+a6ftn m/ 9hr s 200 turns. If the input current at the primary is 100 A, we can expecz.atpm h /l+n9hir6f4t 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 do++ nz,p;vmvs yr69u gow/k9 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to bdp+s,+on km/wu9or z9;y6v vge

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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 secondary haduriiz 0.-mag;*: .3bfy dab xs 200 turns. If the power input to the primarzmf.ygdd:;3xaaiub0 b -i*.ry is 100 W, we can expect the 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 current at 12tg0 *he 6.rg 6+wjldbh0 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line *d6lt0g. 6h e+bwrgjh 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 1 sqlejn l gzo z,tx0*e/k51t;is usually stepped up to 4500 V by a transformer and transmitted through a power linete1xz1o/,ks t0q *zl jl;5gen 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 c8 dry3bc+ b)q3+v td:mhh 4whk2 :elmaurrent 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 th+2d mhc4y b +3h)v:d3:hmbe8lqr atkwe 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.jnjuifr1v-,m23 :vyg 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 were rigm3 :vy1jnu-v2 j,f 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 00 cmut /jte5i h5h::(-d av.l geou7md.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 5lu:-moav 5jh/t hce i7md .ugt:e(d0a 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 10 6rk,ldq b7xx,djgv/f4j40rgiet(v 6 00 V. How much less power would be lost if the power were transmit 0kgg4,r d(b6fxr v/ijvldq x46,ej7 tted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transmitted on a lin,rqg tjop1 h.3e w.1tjq r3 pgh,oith 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 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.f bax;qqa5 x2oftz/700 A. How much energy is stored in the coil's magnetic field?b0z xxfa2o7qtq /f5 a;

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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 inductor. Whj ih8;r n 3;54un xd0mjfvgh-uat is this circuit's time conx5 jf3 idur ;h8jhn um0vg;-n4stant?

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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 voltarl ia4ibx(: ;vge 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. Whaeshvpwbe.:r/0t9-a-( tt lae t 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 i4bc)ra y.y.bln0t m)ynto a 120-V AC outlet. What is the resistance of the lamya y.4rtl)0nb c.y)bmp?

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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 the peak cu/vryij6s-h /c 26p yasrrent through the resis/-2/csyv jris66p yhator?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What id/ dr6y3r*ejps the power dissipated in the ddpr3*j/ery6 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 is xe h5j n6r;x9rpce- s($I = 0.80 \sin (240 t)$. 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 is g mpr60(8ywe b$I = 0.80 \sin (240 t)$. 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 5 cf zg:e97srr k:ow3r-0-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-mHgup +).ps hzy/ubb 3b.4t/xcl inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil at z06+sn0g bzaa htb-tr/ eui95 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 ,rz+slyox) v8 rsaxb;g;q(a 8W 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 forj;y2 /o)zdkc 0x se)yy 157 W 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.v23j cdq*eid frequency of 20 kHz is appliej iedq 2*.dv3cd 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 1tm+ gq9 2shk:w10-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 h ,b yq mffv8)b2ux*2lcapacitor 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 reactpdv)h5)zk do vb :(co)ance 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 capacitor have ak4 l9idxif10agl c49y reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 100 W03e-gb+rzxk a1jna0 b-ekn10b30ajgz +b a xr?

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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 capac2m 3;e9fsc3hxn. jrpkitor 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 ydnzm pu8/ 6d:with 12.0 W resistance, 15.0 W inductive reactann/dp :z8u dy6mce, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.ip 68psi91n8h/ulw kq 0-mF capacitor are connected in ser1s/h9qui 8k 6p nwli8pies?

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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 Hzu)6 4vhoewpr 2 if a 100-W resistor, 20-mH coil, and 1.0-mF capacp4vw 6re)ho u2itor 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 p75xqlu0;ce- m.ilzoh,(f ;y .yr nzo in series with a 20-mH inductor, what is the impedanc5e.ynl 0,y 7 lq;o zmzu(p.hr;cfiox-e 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 w87vezv3i0vt*g*jkh xs i6 qu8ith a 20-mH inductor, what is the phase angle atsz8uvh 7xqv 3ikg*e*086ijvt 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 needeubxay:s9 cwgo;f) ,l 6d in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 1w9sl;y)a:,fbu gc6xo 500 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 p:5ez 0 aih nd 52-jnyqgxd9;v8 -zifda 100-W resistor and 15-mH coil to get a total y ahi5z8-n;jnp02f:9-x5 vqg edizdd impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450.( h0pf9zxfm d-2bi0e zmvb3;oat vsu.qn: n7-mH inductor at 5000 Hz for a to9e dh v(m.;zpvftab.n3x m 7b20on:zuq0if-s tal impedance 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 1)z ol pt veq8(irkc56a 100-kW resistor at 1.0-MHz for a total 5z1 r ico(qklvep)t86 impedance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is coywem1/zf3 ,j cnnected in series with a 20-mF capacitor. What is the impedance at 1000 Hz?y1jw,m3fc/ ez

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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 / ody1.7bv*f8o1z* psnvvfj r a 10-mF capacitor at 1.0 kHz for a total impedvbr p*z 8j.1svv1 o*fo/fnd7yance 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 wi;33sut fts gqh9 fss5l7nd d4ju-t:z9th a 10-mF capacitor at 1.0 kHz for a phase ant:dt3 u4ulq -s ;f dsg3ntzh95sfs j97gle 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 3-x kfdys9/nl80-W resistor at 1.0 kHz for a total impedak sdfl/-9ny x8nce 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 5tfyosgi7p0 51 ltkn5Hz. What is the phasfp lngso1yit5t0k7 55 e 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 resh.)xg h l1epf7istor, 20-mH coil, and 1.0-mF capacitor are phl .g h1)7exfconnected 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 :tqecxi tx7ovrr* , li*.a/ ,da 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected ta r d *t7xxr*.le,tioi:,cvq/o 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 -crubkw c,eveaw x)0/mu5-hb1i( ba +;c3flf reactance 30 W, and an inductor of inductive reactancf w; ef+cmba w/r 1be3u ,-(uai)c0l xbvc5kh-e 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 containing a 50-W resistor,h3py df msgd.g;vjtx8 dm/ 516g 1z)zf a 10-mF )h 5f 1;xd6d3/mv.zy8 g g1gtsmfdzj pcapacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series wi00 tm(1 p v2yfmyft0p b,cj+szth a 500-W resistor for a phase angle off jp,v(00t cyzsm12t 0mb y+fp $40^{\circ}$ 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 s 0 eho(q-tn9rt1llt+= 200-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum power transferred e1-t0sho ltl9+t(nrq 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 witu-yequ: u+ ib;m: i6patrw2zt4vs01 zh 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V powe1rub062;q:az-szpu m:tv+4iwitu yer 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 circueps. ;px9s.ch:;,vqnal gm q,it 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 y*9*6 dkc +ugis+7p2b zifon5.pe wmt60 W and a resistance of 30 W. What issb oy pgw+*kz d6e*mpu9if2tinc5.+7 the power factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor f.qpnf cup d5 w /yhy0g q4w9e85+q,ojtor a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when cf wet0,4up8q j/5.qhp5ow+ q9y ngycdonnected 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 xkc/ ol.;.dy 68worplcapacitor and a 15-mH coil in series?/d wc;xkol6 op y.l.r8

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is neewy8 yzo( a29wk l1i3epded in series with a 4.7-mF capacitor for a resonant frequency of 10 p y 2e19w8kzwoi y(la3kHz?

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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 inducti9do l )j8qlm;:- dnlpqms6(w or for a resonant frequency of 1000 Hz?p6mlom:9 )d nq q8il;js(w-dl

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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 p6 xrn2 );fw(m;kir wcvy,xc2 tqw:,hilaced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be(hk w 2)v;2r fic,:cywn;wm trx 6,xiq 1000 Hz?

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