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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 units of magnetic srkpsz2c3+0,ujvc 5y 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 thx501 (fujgcqle $emf$ 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 5wazrvd*6r w/of change on the*6wav/d rwrz 5 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 ofbut -h1hej;+d xy ik;. the magnetic field through a loop of wire produces what kind of ckd he1+;.byji xtuh;-hange 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 k1 t*rd o+3bjiwop5sd q6 2ce;loop of wire produces what kind of change on the induckobjsp *;i q3d6ro5dtecw2 + 1ed $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic8+vnfag3 lu/ v 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 inducf4/6p qdkhdh /ed current in a conductor will be that which tends to produce whi 6k dpfd/hq4h/ch 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 horizon /7 qgw5 rjwf91sx/znwtal table. A bar magnet is held above its center with its north pole pointing down. The stationary magnet induces (when viewed fr/q f5w gsrwjz/97n w1xom 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 fli70* . wwpbo. 6 y3gafy,impiaat on a horizontal table. A bar magnet is held above its center with its nort* g.i0,mpa6w fo.b3 iwi7yayph pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region loz u nar8+b9jnyr2p4/ d39slwhere the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil +9j8 4rzlobr3pn a ns /y2uld9as 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 a region where t n gk3jr,mb:x9he magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, wharn,m 3jk9b:x gt 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 horizs)*qb pq s*4hoontal table 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 q4bsohp s*q*) 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 an ever-incremcyp5p4oz+.oder 8) *,7jnat wf2cy lasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, typmjfowe)cr. 4 l8 ocz d,ypan52t+7*he 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:bs gs4 xyg1i; with the north pole entering first. As the north pole bs:isy; g41gxenters 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 an axis wz xnh 6fei ktt+q;.1i(hose 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 roz. ;+iq6x n(kefth 1ittation 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 constant-)og*da7 kpgen hrg., angular speed about an axis whose direction can be varied. In a region wg geo .-dkp7arg )*hn,here 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.hu-bsa;o7hyf3jf 7 q6ce,2e /m)kaw q1gb 8kv
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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 tzxq,(g c(va79e k 5o.dq imxv*hat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic field ,6+uwrfixnxz:w-q v 1zru bo /zu6r)(. 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 directionias)+rm-fy 3;l-wx4mbq 4z n jwec4syy9s38 x) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement crix-jf49 3xs4 3qc8ws yz +sbmy ml4ne w;y-)aoncerning 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 constaxzjyj o34c+ 6fc/;jnp nt 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 transform1;p vu;kd/rng d/h 9ka:+gtpcs

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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 frequency of tf nc 7yr*rghyhwx3,*)he h7x, )*rfnrwg* y3ych$emf$ 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 usrj x7q1qhsyr4zc/uwn 32 fm:.ed 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 thatnxe /6vig:u;atcw 6 -r

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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 morj46v +(mthj; tub6hnce loops than the primary coil then it is h4cuv( n+;jbm tjh66t 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 loo //pi-n 6fzwczcj9h7:bw ,y fjps than the secondary coil then it6jf9/cpwc hz:n, f- i/7jw bzy 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 pa*i.sl a(x p9r2-nnbq ower 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 circuit tyca*oup f(s3 m3(x1x,

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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 conn k2v6ltn rnx-7ze5 qzwdkrj*f;z6 +: gected in series to an ideal battery of constant terminal voltage. At the :k2;j +xkvwf 7rrz5l *et-6n6 zdg qnzmoment contact is made 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 connected in series to an u,zt;; ar 6z;d:dvnk xideal battery of constant terminal voltage. At the moment contact is made w;dnx,uard;t:k z6;zv ith 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 gz-fry3;3g5 f/lp asy y0iwb-with inductance 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 connected totu34c4es5b gpupfg 07 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 auwo+v40ao1w v ne.e y9mw2.pseries to a battery. The time constant for the circuit represents the time required for the cuu4ne0w yvapw2 +aow.o.m e1v 9rrent 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 sl2c e1pj :gm9n(x-oc are connected in series to a battery. The battery is suddncg p:c mx (1-2js9oelenly 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 saqb0z7f g mjum3/bbvx)5x62 hd2n3ikume 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 to an AC power supply. On this circuit, the currhi p5 )fi1kji)s zdby,+0y j1l(hm1rqent

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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 A ) rumvbz54w y t5m.z0:zehnk;C power supply. In this circuit, the curren5y;u )w 40.mtvmbkz zrhz:e5nt

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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 by what factor w1h gx95;ew--6o8lcjo yb zsf txp78hqhen the frequency is tripleop8xg5e j-c wxtq819zysbhf 6;h-l7o d?

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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 g4i9iz u*w1h lacross an inductor is doubled, the inductive reactance oizhilg*4u91 w f that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an ind7) q x(loeq:+iq.sgd :*z3vsejed2 r guctor approaches zero, the inductive reacqr)2vs:ed*g: q3 sj7g ( le.zd+eixoqtance 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 supplw8ky/a) (q)bp+ dz tfjy. In this circuit, the currentaj8kt bq+)/y) dzp fw(

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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 mq:cg uo elvb 4khf7e+q2 anp1 ii8p:1 0d1e4jac circuit changes by what factor when the frequency iq42pg di14+vec:ue:f7 qj011ik bh 8 ol amnpes 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 voltage across a capacitor .zh(gn0yqdi 4o 6idx ,approaches zero, the capacitive reactance of that capac6iz.i o q,hdnd(40ygxitor

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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 ca87 brqqqop8n- n. z)gjpacitor in a RLC serie-nrzp7 8 .q8qn)og jqbs circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circu okl2-o6 gh*3vs hdiu2l9h7 duit 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 circc6zg ouecuhr z1z347, uit. The impedance of the circuit increases if R increases. When is this statem7cg6 31oru4 hu zz,eczent 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 imp;sa)) rym 7f bdt+(mqgedance 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 circ4rva.ko da y*7)r(bpl uit 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 y;bfyrc+ g,+ oiow/n )the capacitance both double in an LRC series circuit, the resonant frequency of that c; +,cr/obg)fo yn+i ywircuit 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 i3ouac d;zf9p-s 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 lu(4xxfvq ,3 awhen

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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 radiu ,ne1vm stru2 e5;hzm ;o*sd4o4xnf2ps 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magm1 h* rp2suxsz do o4nt5eev4m n,2f;;netic flux through the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating ingh32rhz5:f,;4 lxwegg blba7 a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when thezal5;,e3g7b:x wfl24 hrhgbg plane of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a unifora.b4v)whf2ve ;u p5q uociw.7m magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop andwhfv.4 woiupa7veu2qb)c5. ; 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 a5 g , mwq41gjzo8cijsffhwt/w73 u0: zrea of an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil xdry1f+vk si 4s* v fru-; n* 41a6zdwuh0v1zjchanges 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. A map4x sh1u .(ivo,y:sqxat+- uniform magnetic field is applied perpendicular to the plane of the coil. If the field changeso -u1.qymaxva: 4,px(sh i+t s 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 s0+ (l hmld;x (9kcdcfand 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 ar*rcij*6 z)y)up0nn,jldty1a ea $0.20 \; m^{2}$ 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 l8g/ 2 huc-g8k qjmc2qyocation where the downward component of the Earth's magnetic fich2g-kj2 8q8/u c ygmqeld 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 ovt jmx0,s7(lis 2.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fl0xjm v,os( t7ield of $5.0 \times 10^{-5} \; T$. If the magnetic field vector points straight down, what $emf$ is induced between the two ends of the bar?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The coil of a generator has 50 loops and a cross-sectional area of yr4l(r;6cxc r$0.25 \; m^{2}$. 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 consi(kl8byu z f7q*sts of 100 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armatubcsn:b 2 (esv0re. 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 fiel(0b sben :c2vsd 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 3dduwr+6tpj k5g gp2m+2 e,vn area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output l35+qzj fk)iyz9;8m)w /shvkj /c qnyof 12 V maximum when rotated at 60 Hz. A magwjc k/8;i+q /v)9 3)h5nfszm ykyzqljnetic 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 82 rmg3m09m f7 sjvzj*xrw(vja 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 resistaifj9rd7) xtzeh 0 2omhd1iczyq)p20 yz v77j6 nce of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance oppp2sed t7b5;7u 8 btbf 6.00 W. The motor operates on 120 V AC, and when7t2ubpes 75 d bb8p;pt 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 a 24-V powerajfc2y :pt5tu,gthk-: 7/wpr supply. The operating current is 1.0 A. What is the 2t- yw tprk/ujt ::gc a5fhp7,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 res1pg0 dcl4n-s7z kei4g(s27wggn/ pucistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. Whate 2cn7c znl/7g4w0dg ug g4-(ppsk 1is 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 5y)by0j2q:li4ct sxd ; n o1ie24-V power supply. The operating current is 1.0 A at full sic:2; n5jxsq4o)0 bytd1 ile ypeed. 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 needefe.kbi wg4.w ;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 transforng b2ci6a-zha 8m9b (gmer causes 14 A to flow in the secondary. Ho miag9 6c(2n zabbg-8hw many turns are in the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are nej)d9 w*q, pc-3 lhzcsdchp v*9cessary in a 110-V primary if the 24-V secondcdpczchw *p,v *q)-ljs93h9 dary has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consis5la 0jdf;c(k 6-xc hs93qsy :fhqek 7cts of a 500-turn primary coil and a 2000-turn secondary coil. Ifxecfd0j ( 9-s5ak6h sqqyh; : clfkc73 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. Assuming 100% efficiencwrwg6q5r; q,aoqui zhh3.u bm 5*o/5jy, how many amps a , /5 uui653 hj.5wgo;bhqmrzo*qa wrqt 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 a neon sign transformer provides zst-n9 m9pcu2q*n d9u8.oklh39 jsxn 7500 V at 10.0 mA. The prim8mzq93jh 2x.nu9 nus ts9o9- lp c*ndkary coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil n/ksp 2c08np oand 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is prese8spnkp/c no 20nt 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 scufxzf*l36xjx)b2qb16 9 w j primary coil and 300 turns on its secondary coil. If 120 V l6sjf2bfwj z*xb 3u9c1 q)xx6at 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 haszebh+z2+cqu 1-k4hbe87dc;f .wy lrd 200 turns. If the input current at the primary is 100 A, wh 8hqe rcz.4b1k;fcb e7zd-uy +l2+dwe can 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 im9 l*3nn2eigiq w1qc; ts secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the seco* c 1q9nilq;img3ew n2ndary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns andco6r:cmue* 81j2khv b its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictionacej:uh r6o1 2ckv8*bm l 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 a m1eqo -1zypk3/vy h360 A of current at 120 V. The voltage is usually stepped up to 4za13 y1 eymqk-/3ovph 500 V by a transformer 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 at5y fejef rnkw3,l+.8o 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of totl+ ffj3e w .k5y8nero,al 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+m dh ,qh/v-dx of current 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 percentage power lost in the transmission line if the voltage is not sd/ m-vqdxh,+h tepped 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 linc)xay/y6e rj5v5 ztb /-oawf1 e 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A j)rz6e51wyo va/a5b xy/tcf-. 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 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. u7/sp,uj w9mgA generator produces 100 V at 70 A. In order to reduce energy loss due to heating of thew/ mup7gsju ,9 transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when the transformer is used?

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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  100 kW is transmitted down a 6-W line at 1000 V. How much less power wouloej(+yrq7y* t ahurg w10o8b7d be lost if the power were transmitted at 3000 V instead of at 107yr 18gbjo7(0uq*+ot ahwr ye00 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 trans6n6ft si8p,sroghb: 8 h+rez4. uccz7mitted on a line with resistance of 0.60 :z s br.tonrhi6sepg76 f,c+84hucz8W. 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 much energy q eypn0m ;md1 ez,sm+7is stored in the coil's magnetic fiel edz;,7ms+emn q1pym0 d?

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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 contain- h .yx2giodh3qga-lecm. w32s a 6.0-W resistor and an 18-H inductor. What is this circo32-yx .lh w 2iqaeggchmd-. 3uit'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 63gln/ovd ts)y gp3tcq o -:0tan AC circuit 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 12r /vpba 99jl b(vgr9*r0-V AC 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 AC outlet. v wz ;)w e285mne3n0th fdyt(sq(6nog What is the resistance of the lam6 hwy qm)o se8;d g2n3zw(tt5(n0 enfvp?

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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 12d4cr* .fzgrkl ,2hsq80-V ac power supply. What is the peak current thror.dsr8cg 4zlkh 2*,fqugh the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 12i agy;7rx7b,q 0-V ac power supply. What is the power dissipated in the resia;ybxi ,g q7r7stor?

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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 2)f5 sofrcu 0zi2xes7 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 resisto8ad-xhb8 e9.knam*by r 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 resistord.o ;u(gax j *vcme84 cr:)yiz 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 /ipf uw9 zx*uhs5y 4,4fb-3)ddtxj uqone ,f7at 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 inductivew ,uel*f5 /gzf qtd gfge0f/2* 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 have 14.0 W of ex4d 3,qz oakfit7 hc w3a)e433lia8 linductive 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 necessaxjc-::mm6bpnkxk ,f 7 ry for 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-mHu v5 )g2hzp:ey inductor when 120 V AC at a frequency of 20 kHz is gv zp2h)u ye5:applied to it?

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109#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 2.50-mH coil due to a 110-V, 60.0 Hz sourceyf :/exegx5h: 1edfhmvi .f 06?

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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 capacitc9x d b3xrj(.mor 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 reactani l*y,:f5v u*ws: ixcbueu2f3ce 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 i4qtpb:f)tk: 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 wi +w0su1nyc*gell the capacitive reactance of a 0.010-mF capacitor be 100 W?w 0g un+ey*s1c

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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 cvxj4 f7:yj ;rdapacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W k rzbv yy*77z*resistance, 15.0 W inductive reactance, and 10.077 z*yzb*vryk 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 Hj9g;wyqb7xb s8h4:bp z if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in h p9y4b:sxj8wq;gb 7b 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 10 oh4ed w*n:bj(0-W resistor, 20-mH coil, and 1.0-mF capacitor are connected :o(jbn* eh4wd 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 a 20-mH inductl2mg3;/nh0v mzsg;z e y73 ,(uafnftbor, what is the impedance at 1000 lg0ufm z3h v2tgm7nbf; yz/3(; ,sne aHz?

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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 connecscd alol n8r7;n1( i*hted in series with a 20-mH inductor, what is the phase angle at 10r(onc 7ln s*h1l8da;i00 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 (h6 tb2 twwh,t c28jrfand 1.0-mF capacitor for a total imp 2h8jbtfw6tw(htc,r 2edance 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 isq/xhc ugfr**dmb:;/ vbr4/ ri needed in series with a 100-W resistor an;d/q*r xu vhi/ g*mc4:rfbr/bd 15-mH coil to get a total 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 kn9s6 xih nng1y 9d38eseries with a 450-mH inductor at 5000 Hz for a total impedance of 40000 W?x1yh nk ndsi89ge39n6

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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 iqu2o,eg 7ah z.n series with a 100-kW resistor at 1.0-MHz for a total impedance2,u. zo7gehqa 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 connected89h ja2 5m xjv obv20x5tzw2nn in series with a 20-mF capacitor. What is the impedance at 100xn vo vn 5tbw 0xhm9282jaj5z20 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 series with a 10-mF capacitor :v+ v g9ze- ,3pmj4vwpqr bf6bat 1.0 kHz for a total impj- zb6b4vmp:gewv3 q+rp, 9fvedance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz for a 5kft*mh6tsl .p0isml*,h ,t7kvv 7zf phase angfh.7ttlk*svlz 0i 6fm7sh p,* ,k5tmv le of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 7:aceq obd:kji23pn,mb* p)f1.0 kHz for a total impedanc 3a*pjib k): pf7em2nbqo,:dce 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 cju :++f1 eoz6cam2cd dapacitor at 120 Hz. What is the phase ade2z 6 fcj:oa+dm1+ucngle?

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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 if425dt-2qqigd o p gl0l a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serio42d 0 t5lqqd2-iggp les?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 5;gbh2z0 uevg100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected toze2guh0b 5 v;g 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 30 W, and an induct *)jrdvj y,v.u mu45muor of inductiveyr m4)jumd,*uuv 5 .jv reactance 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 an)(z1g9 r ohx kweg8i*rgle for a series RLC circuit containing a 50-W resistor, a 119r k(zwg)ex rg8 *ohi0-mF 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 necessary in series with a 500-W resistor for a phase xd.tuqbvf 2x+w n .h8gm-b 74jangle o-dvu8mgn7b2t. wxjhfbqx+ 4 . f $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 200-mH, C = 10.0 mF. At 3f4) dip5rqsur1k r/xvl9g8 ewhat frequency sho f 9p/rkegu r)iv41l8q 53rsxduld the circuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistancp largqy7ob(;, *h* aie, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit bloi;rp*ag *(hq, 7 ayis 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 an2q4uhhp 4;czr nq;wrs 7jk9 7p 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 an impedance oma09 4paki514rvcm/+3 tge dq snk9phf 60 W and a resistance of 30 W. What is the powe0n3pk/a 49ge4d pav1mics 5r+qmth k9r 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 ci 7yqq7t3wi 7lxrcuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply xqy 7i3q77twl?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in ser+2oo3 k xgky*t8m y5ecies?+ txcme82oky*kg35yo

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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 ()vzi3gvl4ve,x n72z1bjb p g a 4.7-mF capacitor for a resonant frequency of 10 kHz?zepvlvb74gj 3) x1zgv2(ib, n

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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 fo41w+;d7wyk il(pgz/ kxqp5m blz lj,f -tb) +rr a resonant frequq+5)f-g y7 (w1lb+br;w/jzilm p,tx4 kzkldp ency of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor u) xik+ap3 g(xand a 40-mH coil if thea)+igk ux(3px resonant frequency of the circuit is to be 1000 Hz?

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