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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 areja: 2a;oqxs:qn; x67l uldbb6 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 thos7vyi7(rb cf u5,vica 2x-)sat the $emf$ 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 kind0-k1.akqytgom 0r t.h of change on the induckhk. q y-mgr t0o.10taed $emf$, 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 sb g(u pm3:nj-a loop of wire produces what kind of change on the inms-3 p: j(ubngduced $emf$, 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 5iyr*t-gpoml4 a j)8/wo db1o loop of wire produces what kind of change on the inducdmb*oyl a o)4 -t/r po15jwgi8ed $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic field jlrhzw03,yf;s hz + n,an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an induced current in a conductorn,bv2pkr07g2xnv5li( p y np / will be that which nvy 2n,p2vrib05glx7 p(pnk/ tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar mgg4/psl ufb5jc u)9i e8,v,1enzs.,wv0lyia agnet is held above its center with it 5gw,n,a0iv1vul g, l /bzi.se 9pcyuj)es4f8s north pole pointing down. 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. Atv;osrii:g )6 bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the fallsi6t; : go)riving magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetic field veu omsiu li;b6 3x9y9.xctor points straight up. 6x9i ixuub;s 39m.y ol The magnetic field vanishes 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 a regiou 3nknhqvbw + 1iw;,.ew jc4k*hc,wg3(tmv 9yn where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed hw3g,vbu*e jw,w9+t vy;q1n i3nkm4wc kc .h( from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table q;;yvu rkc;h. mpk;8wtop in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction okpk.q ; mur hyvcw8;;;f 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 an ever-in(rq8t-2336kli mvjkozv av:ncreasing current nortvkt(3z qnl-av om6rj 3k:v8i2 hward. 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 throug:7idi6ddg j7mbr9k3v h a loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as rb7d:69k3dj7idg imv 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 a6,ngtk 6y a1t+a wr6zhxis whose direction can be varied. In a reg ,ht w6g6r1zk+nay6 taion 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 zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed k-p4gsr3gsu 7w+kt( 9qmp/vs about an axis whose direction cs+sp- u 7(t/rkgm9sgk q34vwp an be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if 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.,izw gmn+5dws g v9p dxe.4s(s-zs29d
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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 thfb q+ ,obs8a0or2k+zg at 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 fip nnt5*ba5 3z igh0e3knxb8h9eld. 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 gqq(; ;q o+davtldd5*f . clp)east-west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potentp q. q* ;;fdv)adocg lqdl+5(tial 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 a-h gg 0qvk km:t;yn390tee+tst 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 tran n9sqlx8n5 al+m*/pahsforms

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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 secovnv2lw6v k2ab 880c im60eh gwnd. The frequency of th2a0 hv c ibwvn2kv0m6wg88e6le $emf$ 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 2.auhp)kvglx; :blv;mor7f. 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 d b(fcqwh ve:(+ ln/j6 witkt0:evice 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 c/:nmh4bm+2 +tno b r3)dolxujontains more loops than the primary coil then it inmn:/34 du xo2 objm ++)trhbls 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 con6 mc+6 jugtux4tains more loops than the secondary coil then it is atgcu+um6 x4 6j

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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 ep63ljmky.wg95 v t.g;o1i wiinput

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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 circui* *dcc. ,,wm5qbf x7njyjcq8zt,

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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 ideal battery of const uii;lkpr13v) ant termir 3p1ik l)uv;inal voltage. At the moment 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 ideal battery ofo5l.w,p:ahxcxvvom sdo gef),;:2fv e48 wb + constant terminal voltage. At ovx) ex:feb8+lvf:,5 o2vh wpsw m, c4og;.dathe 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 inductance Lod0.3o8y kqgu 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 resisd *f+ngltftk.o n;9 8utance 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 ay5 wrfpd6 d+0pre connected in series to a battery. The time constant for the circuit represents tdf 6dp+r5wpy0 he time required for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor ar* 021y jty5fgm fk1psxe connected in series to a battery. The battery is suddenly removed from the circuit. jf511sg2pk m0 fyx*ty 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 exm+a i7akxapkrzey05o ;; ./ ybcept:

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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 tr ee3j2:e dht4o an AC power supply. On this circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this cnq1xl3 tpb i05)k,4 yb.d thv*z u/ldiircuit, the current h) iz.1vqxb ikudy /05bd*,4plt3tnl

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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 changlg qty9 9ua .c4ba4za,es by what factor when the frequenc gu4,9zaqb.c aa9l4t yy is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an ind6p+c3exm9wvr2*dv *m8hz ou suctor is doubled, the inductive reactance of tc*+2 mu6 odp*em hzv9r8vx3 swhat 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 inductor approaches zer 1y cxz snt8y.juxp848o, the inductive reactance of thatyt8s x8 .n cp1z4uj8xy 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 circuit, the 7wqbfw rhx +(iuv0 q+t1ol6+ fjxbz:d)y0c6vcurrenxr b0wdq)+ +wyb uxcih6 ftv o+:j lf76zvq(01t

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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 factor when taa xxt) 47h5qnhe frequency is triplexah) 54qa t7xnd?

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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 approaches zero, the cs:(e rn;5vwv sapacitive reactance ofes5;w(s:vnv r 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 cap4uz)eo3qj g( lacitor in a RLC serzj(qe4u )l3goies 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 circuit is defined n0j+2*/r0fgacfe xvmas $\cos M = R/Z$, 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 ;f)c *p bqeee8adp -*pincreases.e)c-bpdp* e; a8q e*fp When is this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impee t +:xrmq-j9ydance 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.mk.x5u:jr4yyw; )(pkhrb 0 ht The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit, r28 k12og45oz32 hb:dzmcdn xwydk/ethe resonant frequency of that dhzdgcy821 roe w: d /2xo5nkm3z24kb 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 applieoqdbxe)cgoi. 3k(3 h(d 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 ockis. 8pnau h84curs 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* oa5e/9slxk6uc 3afw 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 the magnetic 936saofcu/ekw5l x*a 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 ici*bkqx q ai2(14wuf: nv(a c(s rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are 2fxc1kwvu (nc:*biq4(aiaq( 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 r -axg* 8tuor:x, hmi9p ke;x+uotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the mag; pox xu:gu9+tehr *8m,-a xkinetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is :d+cs.(dk e x zn43h-ngeiwj *reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil changes 0ebl1efc w(ciz x zo;98i8b7efrom $4.0 \times 10^{-5} \; Wb$ 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:l9 iumgy)ck6 square frame with sides 18 cm. A uniform magnetikil mc69): gyuc 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 $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an area o/oy62 q+afi9pl a3qn xf $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area;p hdr-) ki-f)3 nakacv47pgl $0.20 \; m^{2}$ 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 locationkr9 57trk8-- j2s) ybvex8ts0 gbh yvb where the downward component of the Earth's magnetic fieldh5 k-sj-)8e ygbytk v 9rxr2 b8vs0b7t 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 aodj31 ye6kmgtlq+o3 jw0rl ,+ constant angular velocity of 2.0 radj+qkw3mo+ r0tl6g ,d 1e3yo jl/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 and a xgq37gy laj72:oys l: 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 of 100 turns of wire of area p: 29it/i9 uudoesooged./) x$0.090 \; m^{2}$ 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. Each loop i, jot8h don n0pqz9f*0nbn:9is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. : j9i nonqp8d*nb n9,f0t 0zoh 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 or5x/ool *c opy aa,u/ld.yr 31f wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an ou* 6j -fnjde3vxe;px y4tput of 12 V maximum when rotated at 60edv*xpjefj 6 ;43xny- Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generatork74l r647ox oqnt +ukr 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 resistavv9e5v a/ 2v.3.nu3: zks5cqpkjjis dnce 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 resistap ix;5e1 akrj-nce of 6.00 W. The motor operates on 120 V AC, and when running at full speed it genek1 ;ixrejp5a-rates 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 resio +nppz,ob aj::ws1,y84 ofe jstance 6.0 W is connected to a 24-V power supply. The operating current f,e8 : aoo+n ojjp y1zp,:sw4bis 1.0 A. What is the start-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is con *npw ai.tk/ml (-p:clnected to a 24-V power supply. The operating current is 1.0 A at full spee a* p/ll (mkpwic.:-tnd. 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 tov sx+*: w 8r8wq;3svmo/ umccg a 24-V power supply. The opr :mqs ucv;w *8s8ow/3+cmvg xerating current is 1.0 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 needed to reduce a primary vvri6 om. h mlhq p)4.24cjvb*rvlc h05oltage 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:gie3c4kcj 7 q the secondary. How many turns e34cj7: ck igqare 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 110-V primary if the 24-V seo :eo 4opo,0iacondary h:ooo a4op,ie0 as 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a -syls6l von: ,500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the cu s-l 6nvo,l:syrrent 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%ozl+ 1nj n;d)diq91dreso4/ x efficiency, how many amps at 24 V can flow in the sd1ndor/ln zqdei1s;j 9xo4)+ econdary?

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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 nee78i/f 2si orion sign transformer provides 7500 V at 10.0 mA. The primary coil operates o2 r87fe/isi ion 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 priu o+bc;14r5hi peql5oqd .c: n4 wen:cmary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what h+e li.r4qq oupc1c b5 5: n;dec4:wonvoltage 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 lber6fvs3 h:u-rs/u2 kq *ak6has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present uhvkb/q 2rs66r*s f-a3:lekuin 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 transfor(pog* 2vbo 5 n v1gf-ib3vhz5gmer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output curvvz onh 1v3p-gbofggi (b25*5rent 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 hw ju+/5xy4kd ras 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltagdwyrjk+45x u/ e of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its a1nght/o5 otl+ j a.l1)bmn1 bsecondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to begmj5+1 b tlnl/ htn1oa1o).ab (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 currz1m -odm9wa ,jh8p;58bi cfk yent at 120 V. The voltage is usually stepped up to-mcoy,p8 k8afd1i; 5mhb zw9j 4500 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 at 120 hhd- ,i le+e9ysu1 s1iV. The voltage is usually stepped up to 4500 V by a transformer and t1 9d1uhiis+l, he e-ysransmitted 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 ofzla0d 4;jdvhkt94k1y 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 adl9 1kzk yhtj44 dv;0the 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 j945bz2lp;p k suild .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 steppuj . d pkbz49li2l5;psed 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 jjnp2 xv5bm ua:2 72nuresistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heati2 nxnja pb2 5:7ujvm2ung 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 Ved 5yq9or/5iyht )t2 f. How much less power would be lost if the power were transmitted at 3000 V instead of at 10 htdyo5q te)y9/fi25r 00 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 9wcts*k v9c nonj38w 3440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the origojc*w tk 38cnwv39 s9ninal 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*q aa2p 1o1wbf 5.0 A. How much energy is stored in the coil's magnetiq1o1f *2aawbpc 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 n+kleq-1 jmpt8*2nod7iax(* 2w bvkr18-H inductor. What is this circuit's time constanm*1rpkqe 7kjvn ( lbaxn io282tw +-*dt?

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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 tho a0kgmde/.3n e rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outlet. What is the peatdc3aq; t,,c/3rtfsxq h9k. ck 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. What is the resistance c/*up 0zsjg ,baz6*t qof the lamp6/ zzbsg j,qa0* tu*cp?

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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 conneckc-m e r:y 5m ecjx())f.zd8xkted to a 120-V ac power supply. What is the peak current through the resi)e): xx-ekm cf(.5zr8kcmdj ystor?

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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 m4 55f/cjnb rj120-V ac power supply. What is the power dissipated infc/ 545nj jmrb the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-Ww3 pj7)m4j 6w5 8g.h3;nlzatoamrgz q resistor 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 resistor is ( ct/nsgj6v0q $I = 0.80 \sin (240 t)$. 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 *- muhl6nxe xfxbh4*x ,,vp0d-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-mm6os4gp-.gqf y c,: xbH 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 reactanq5ns: ylr0)e9 q+be6 /g rjgpkce 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-kxcm 2s 1mebnpn x:4,6mH coil have 14.0 W of inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive xwwswp7u oy ,.+hap7 +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 inducna+h2 ko y.obx0 st9/itor when 120 V AC at a frequency of 20 kHz is app .hx9nk ya0/b2 it+soolied 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- 82.oci7 nryz; urca:t)ux7ou 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 at 10 kHz?a9b78ztzz8 c/drrgt.k)bwg ;

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10vfw9fk j;k a9/osxh/4kh+ 80ftl zez , 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 have5xo (m .cf * pwvuxmqjyy+h6kn461,oe a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.0lcolj/v 9f(d h7 gu+y410-mF capacitor be 100 W g(79voj cly+lf/d4h u?

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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-mgqc sc4s+6:myF capacitor at 1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W reg(g0fig3nx s da* d3m,sistance, 15.0 W inducti n gi,m03d agfdgx3s*(ve 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 impedan-atkxifu)3 56p a *tjgce at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in sera*6guj-pktxi)f t35aies?

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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, and 1.0-6 dqhsi(bm/mw-/ 58a8s,.n a.lgs fi r jwrzo.mF capacitor ars.is8 o(baqw, f wmmzaj68r. is- hgn./l5dr/e connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inga z7/a5;zuze,7z2b poh;ad zductor, what is the impeaez/; zbz 72 a7g,;zuadp5zohdance 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 resistorr3:b -cu ee 5/sngphy: is connected in series with a 20-mH inductor, what is the phase angle at 1000p su:yeb3n- 5regch/: 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 r0 1ko fz:secwxyv+1 *coil and 1.0-mF capacitor for a total imped1es*wxoc+r y v1kf0 z:ance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resmrfc6 q azij4,be,(qb u9 h* ;rrph43ristor and 15-mH4mbr iub qh(f*c;raqh436r, zp j9r e, 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 pbj2 km74 eqyx(jes2- :9gzn xput in series with a 450-mH inductor at 5000 Hz for a total impedan4z j- yqk9s7ex(2: n2gempxjb ce of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-/sbd(78 lnkp xnyw3x- kW resistor at 1.0-MHz for a total impedklx w7nx3/b8s(pn- dy ance 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 con 6fqkwk0dc pud53( 8thnected in series with a 20-mF capacitor. What is the impedanf8uk 3 tqc6kpd0(dwh5ce at 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 series with a 10-mF capacitor atmxhiy.5b 2 qr. 1.0 kHz for a total impedance ox m5hiy ..q2brf 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 s:p-dfyq7* diphase *dpfd-i7y :sq angle 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 rt.8w2n fwhgvrv7v8 s1esistor at 1.0 kHz for a total i87g8w .w nhf2 r1svvvtmpedance 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 Hz.si: e.q ee z1a5xo9/ki What is the phase /aq5oe. iz: eiskx91 eangle?

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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-,kd ,v9mvvc 1dmH coil, and 1.0-mF vv,d1kmcdv 9, capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W +0e,)n0m bgaqgv og rc1(jtan99)yt aresistor, a 10.0-mF capacitor, and a 0.350 cb)9jtaa(n,tr0 0+1e9 )yamgoqg v ng-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 capaefn33h j+/vgzz5q(ps .,p xzdcitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in seriesj+/3 h.nfde53zgzp(q, xvp s z 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 codn p lbgp3v(oc51 w/ 8i/f.ehzntaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz poweri5bc./dvh ofg (w p3ln1pe z/8 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 irylq p qy7fvo,b -);)pyqmm/ya hg2(+n series with a 500-W resistor for a phase angle of-p+y7gmyqfy p)2r ,qbov(;)/qyamhl $40^{\circ}$ 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 zvyhm y+g3j(t;mp 07c1c,kbn. At what frequency should the circuit be driven in order to hamtcb;yg 10z(n+mc 3,vj7 khypve 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 ;nd*g4bdnc as ;8a8 valht:(oac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is conn 8*s;tvg4(;a8chb nln:o dd aaected 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 AClf4:*u y 9sdwn8asxp* 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 of 60 W and a resistance ,wulty p((wbu qge5i: c0 dl4*of 30 W. What is the power fac4:lc*g0(bpl,quu w itdw y5e( tor?

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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 seriecte(-apgfq81 s RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connectedc1-aget(q pf 8 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 1.1yk 1 j kmf*,uemvt/9i0-mF capacitor and a 15-mH coil in series?j m/11 tk9 fui,*mvyke

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is ne* zsabuuj8d)qy /, uj0eded in series with a 4.7-mF capacitor for a resonant frequency of 1yjs z/8j )u*,u0bd uqa0 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/rmh9k 61pwi a series with a 3.7-mH inductor for a resonant frequency of 1000 a1wri9k6/hmp 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 wi3mq:k2zo funojsb.0sfz 7k33th a 30-W resistor and a 40-mH coil if the resonant frequency of the cir:73suzkf.zosfob23qj3 nk 0mcuit is to be 1000 Hz?

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