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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 ofjtgmku9 t3- l:efg(6f 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 inducri2q0kq 7 1zkqtion states that 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 kind j b)mzbza1z)4pgr, -q of change on the in-14qmzg, j))r zbpz baduced $emf$, 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 th:khdygpp1zm1(k,bl 6c/wz h *(vxz;i e magnetic field through a loop of wire produces what kind of chapm g,(hxv6 kzw/p dc11z(zhlyk*:bi; nge on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of change9n4js9jv+ p nv*n9wwz on the indujzvpwj4 +*n s9 n9vn9wced $emf$, 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 removedkg;d ysh 4n52y from a magnetic field an $emf$ is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to Lenz's law, the direction of an indiv7si8 1u,ba luced current in a conductor will be that which ten1,ba78sivi l uds 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 magnet is held above iq(8:xkdshjiakl0-. wtn rd0fq; va;8 ts center with its nok0v l k: w(hx-8q;.n0;8fada siqjdr trth 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 ta qf2y-) zkot/zz-d i0bble. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the )0 yq- of-tzz2/zdbikfalling 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 7plxlzj k /xkwo 5,y;gtz.* j3where 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 thisyk3 tj,x.gkw5z7/l lo zpj x;* 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 regioninh2e cn+gik/; p7b1s where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from ab1ci+i;/ep72nhb nkg s ove, 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 1ymf;nr2do8 wmcx yykv0: 3c ;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 inducey1x my0ydfc:o wmvk; ;2n8 3crd 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 nz(abi 4cwgre u-/,k i9t,4gu lies on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. Whenubi, ewg, r9 n4gcu(z4 -k/iat 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. A 5 yv8pv1v3hpfs the north pole entpyvf1 h35pv 8vers 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 rt+ ;dosf/.q8,gjers b oalq55otated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of r; / btdfjasgrs,58 +5oql.eqootation 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 isk99l,f0klry p rotated at constant angular speed about an axis whose direction 9f,9l lyp0kkrcan 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.qnuwi8o/au 2)hbsw 9 tb;u;e/
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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 tg(e 80voq q;vbhat 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 -ghtfp,m ;xs: .yy(c ifield. 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 mov35lfz5lm tf9 ned northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential inducefln3 5zm9f5 ltd 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 con v6z e1fhd55uduel68 astant 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 transfornvsu7wwxrx n.j*n v+b,: c,/j ms

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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 / 8ax/+ v4xlagrdna,m each second. The frequency of tva /glax ax8/m4n d,r+he $emf$ 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 used ts:; ilzllx 5;gw-( p tzifa;(vo

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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 thafc)l/jm+zfid(pj3(-. ktl ryt

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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 8, /jvdak2b0p pfvow 9-jyg 5pthe secondary coil contains more loops than the primary coil then ovgp-da v,j8ywj b592fp0p/kit is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops than the secon 4f)slzqh3 sm.c hh/6ehh) a/udary coil then it i)zhsh /hmc4qshe)3l/ f hau.6s 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 powei50j qqn v.x k),+tlek(br:fjr 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 resonan+e m)h/ou mb(mt 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 -c;maob 3kt e.a4,pqcin series to an ideal battery of constant terminal voltage. At the moment contbet 3cq, ;.-ka oma4pcact 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 of constaxfcs6ce1uv( y n-a)e*ppx.u8nt terminal voltp( ac)1 p-xfse n86.*y xuuevcage. 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 inductance L and resistance R is con x-5:cr x3n2d:5yw9p ng3ujluiqm.ca nected 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 ry3 h; a kd0 ycpru;.lhaqve9.3esistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The t:) tfcaur9lb7f )+newime constant for the circuit represents the time required for thfcr7)e bw+tf:n)9au le 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 t7jlmpc 7-jxx9 o a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents tjpxm-c7 jxl 97he 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 unit26nnjc5 d/)ltrt98,pbflxd tjoa,h*s 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 circe1q lx mk(57icuit, 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 co.x+o z( 6 gnm6fpwrzm k,j;q:fnnected to an AC power supply. In this circuit, the currentgmmqfzzpf w+r.nko,j ;:6 x6 (

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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 chae46arj: r:0oodt :uxgnges by what factor when the frequency is tripled?ouogxe 0: a:r4tr 6jd:

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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, thc 8pwptf,av*2 e inductive reactance of that vw* cap,t8 2fpinductor

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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 vh:u gl/3e 7sdwxb **mzx1 qyo0oltage across an inductor approaches zero, the inductive reactance of td* h31wso/eqzml x y:g0 *b7uxhat 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 sa7itji 0kqjg8mqg .x5e7 *e v:upply. In this circuit, the curreneei q5igjk ja70xv:8. q 7mt*gt

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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 cir.r+nu-t 2kgxwvs3fp *cuit changes by what factor when the frequenksx u 2vrw.3gnp+t*- fcy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero/dqxkdfdb x3 v3ra4e);o7f5rd9av:e, the capacitivo5f9v x:efkdea)vq 4 37rx ; r3bddda/e 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 anglx5fvvl2h 6pj-lgk)p +5py( xw e between the voltages of the inductor and capacitor in a RLCy5l vv+h5pw2 pjkg (fp)-6xl x series circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC circuit is defined o c-3 mtgk(px1dey t/(as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R increa +nm9qj6a)zxy ses. Wj+qy m)9 xza6nhen 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 circuita v.ubw/jm 43gct2z:4 s(; ydvmlsy9t. 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 circu0j w ,roz9h2neit. 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, t +t-7yujbxb/9k:hnllhe resonant frequency of thax9 y+:tuhj nbkb/-7llt 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 drivpfj5jg dpz aw28d or 48-p9n1ven 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 whed/x3 wqys ,qocia cfl-/7; xa qnok-d3.ae-l )n

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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 field of 0.f z15/ygx0yj n20 T. Find the mag/ x jfgyzn105ynetic 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 in a uniform magneticcmqq*p ;+1kcmqs/ sq7 field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendi 1qspq +mqq;m*s7c/ kccular.

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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 z9 91akq o4hpbm is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through th qhbko1a994pz e 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 sin/o+(5ot5 yzxmmv4ecisb;s 2 wgle 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 changes frovi:g*py.r9 y ym $4.0 \times 10^{-5} \; Wb$ 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 wit fn ze8r5jnbqbp 362)zh sides 18 cm. A uniform magnetic field is applied perp3 qz2ep)rb 8n fz56jbnendicular 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 tplr:90kmpf co6 + y. ou2g,wp;s;)n9zvl kjhnurns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and area l3fsqx5 :j2vc$0.20 \; m^{2}$ 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 location where +-zxf pi*2 9 bmjbuj49fhxj8gthe downward componep-9 x4 fumjx+b fi2jgz*hjb98 nt 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 velocitybdm.+sfm 7 p8y of 2.0 rad/s about a vertical ax mb+ yfpm.d7s8is 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 cross-sectioncze4 h*io5i65 fi1vd vo n)zk.al 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 oqq;1 kl;-eom rf 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 b2(3b1n) t(lu aypqhvloops 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 blvy13tq(a b hu()2n pbe 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 are8 j(xlyq.-jbewrp.k 7 a $0.090 \; m^{2}$ 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 61bpxkyc6kp+ox*f ,.o hj,xa an output of 12 V maximum when k ojc x6ox,pb .h 1ayk*f+6xp,rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is $100 \; cm^{2}$, how many turns are needed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are designing a generator with a mlg.lw8;pe1r l q*mj 0laximum $emf$ 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 h (tnjpc3l+v 7x9c k1gjave a resistance 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 of 6.00 W. The mopow6bhhq h6+x+k - nd.fh:4 ovtor operates on 120 V AC, and when running at full speed it generates fxbp6-qk:hh h6wh +n.o o v4+da 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 i//s x0-mss eids connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up curren m0sxses d/i/-t?

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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 conneczo * xhqc56n3 ng7*umwted to a 24-V power supply. The operating current is 1.0 A at 3 *nhum *wogznx5c 67qfull speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connectehha4gn p fol7 cxgeu1ihc*+7/ ul.5u ;d to a 24-V power supply. The operating current is 1.0 A at full speed. What is the b/ hh5u l7+*ugo4ca.ce1 nifuphx 7gl;ack $emf$ 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 *juflds) 20uko hp 6q/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 pd9vbuim2-b0l rimary of a transformer causes 14 A to flow in the secondary. b 02dbm9-luviHow 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 necessary in a 110-V ph.ck0 pzmxl/4 rimary if the 24-V secondary has 100 tmcxp.k0 /4hlz urns?

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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-h1mm:sex53s d/vj , ufturn primary coil and a 2000-turn secondary coil. If the current i3/xs :umf, 15vmsdej hn 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. Assumi)sij4 llzo5 o jt*v57mng 100% efficiency, hml4i ol7) sj55zto*jv ow many amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of;xx//y s7znv6 z,znqg v:7prq v 17qsx a neon sign transformer provides 7500 V at 10.0 mA. The psyn:7nx6/zvz;1x7s,vr z7 / q vp qxgqrimary 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 e49r.lmi *tpjc( x ergdl0:k.primary coil and 300 turns on its secondary coil. If 120 V at 40 9gprd:l (ie. r.lmkjcte*x2.0 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 hasg c*2u3w y+ p)6wnx7vy dnmg5o 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is appliv5xw 7u+g c3) mog2 y*wydpnn6ed 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 hasv kin 05x(sdx e.hu6i8 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current at the secondarxkx8 .ihue5i6sv0(d ny 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 transforme1 -o,fnc6mxvt f0deo 106 tjoer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to bm6,-f0tn cv1xeejoot f 61do0e

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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 has 2dfdxo89 st5p9m4dw *h00 turns. If the power input to the primary is 100 8wd9ftmo 9dd hpx4s*5W, 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 120 :c,aw*v m1h5o:g ou:aq d*zb;bdf*ku V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the seconb u *oau:dcm5 1 *zad::vk;og*hw,fq bdary 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 tvdpdz48s d:hoi/e0. dyrd; , A 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. d/hrt ediz8, sy d:.;0odpvd4

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stf jrh3 szn.6q)epped up to 4500 V by a transformer and transmittej. qfr3n6hz)s d through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 58gl:+- /qoxa li8aezx0 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if thex:llia +e/o8xqz8 a-g 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 0.4 ceop+rp8(s6k: m,w7me gzfs60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy is lost when 8ko6ps mzce4fes(+7:r,wm gp 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 Vpt/ijm.nbkzb7 am)* 0. How much less power would be lost if the power were transmitted at . m/jb i7 b)aktnz0*pm3000 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 onml/ww) z)uj(vd+wzitel57+q a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with w i++(/))ul7v wtzjzmldew q5 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 xs l-7;c:fr8to0vmj lof 5.0 A. How much energy is stored in the coil's magneticolxc-7 v0 8s ;rfljm:t 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 -rz7uoprwanjqq.9/ 3 and an 18-H inductor. What is this circuit's timew3 jap -rq uon/rq97.z constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms voltage is 120 V?x*wlr3o daz0 p( c8t1x

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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 12fxn/ a)j (wf0z0-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. What is the resistance o v wmkrz0jp7vx2+gm) 3f the lamw3z7kjxgv r mvp +m20)p?

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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 cowbvl 88laga njh441-urrent through thnw av 1o-4gjlbl 848ahe 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 120-V ac r yv/:xmr7fez) h:yh 0power supply. What is the power dissipated inrm7xz:ryf) /y0vh:he 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-W rers.a i wiyyn/93bn 03wsistor 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 resisto8v9cr/1)mid3e k xw ktr 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 50pmg)b))ycj0f wlw7,s -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 tajpm+ usvz nc03h*;* cxpq8i5st-3n of a 1.0-mH 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.nit( 3 4hevdl.n)a.vj 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 itb).p0 zb f/; vsieeh( :ll0:u/uaw xa 14.0-mH 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 inducvrzteyg.ym;(otxz15 uz/ tk3 4 32rpotive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of *w, zpcjj- iaa3s/k,g20 kHz is appliedc,3pjwz,as*-g ki/j a 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-Vzy xlys(wim:8 3gq8pc,(ci: j, 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 reacdt:m vkk:tyc 92w9, s.okmxa,tance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reactance at 10 k xtm p.,u0ulu go2j0b9Hz?

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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 ysvf-.w6h+kl have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacituc s4lm+ (e yzzr1o;2eive reactance of a 0.010-mF capacitor be 100 Wo4e;c( +rlez 21umysz ?

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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 capacitor at 1000 Hqm +hn f: wjy*yox13/wz 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 resistance, q1ac9s9qch j1 ftjv 3715.0 W inductive reactance, and q1ft ca97c9vsqj1hj3 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,.jki )ju 9z0)a3povax and 1.0-mF capacitor are u)zka.j o vxij9a30)pconnected in series?

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117#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle at 1500h ki6ckf,dr m83ia) r1 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connecteir )frkim6hk, 1c 83add 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 wit jx3 r9n 3-rxil;td9jeh a 20-mH inductor, what is the impedaxnlx9r 3ijrj9; td e-3nce 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 serir:hrr:c-)ayqw 8 (df 6yo (2gujd6rfles with a 20-mH inductor, what is the phaserlrryj:u6d -oh(fgy2w (c)rqf: 8d6 a angle at 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 needed iw hh(uivo am8 5jss06(n a series circuit with a 20-mH coil and 1.0-mF capacitor foroh6m5 u8 v0s( hjs(iaw a total impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series wc44w 5 gbax:+ mxjj*njith a 100-W resistor and 15-mH coil to get a total impedance of xj *:5b4gx+4w jncamj 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 f4jkx sfa5:,p;un.a dym+e -gpbv.g5 in series with a 450-mH inductor at 5000 Hz for a total i .-f+mx5jg;vaa,skpp .df eg 5byu:n4mpedance 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-kW resisf(wnh iu)ly-7tor at 1.0-MHz for a total impeu fny(-lhiw) 7dance of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacit-r*t9rs2b on o,fb xi2or. What is the impedance a,2*obtor9 b srfi 2x-nt 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 y2b *k4c5wl 1,6pm2cqai day9uny: kiseries with a 10-mF capacitor at 1.0 kHz for a total impedani6*2dyq1 ypkk ucl:5iybnac9 ,4aw2m ce 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 capacitou6p/3x.p htrs +q/i/lzso/cl r at 1.0 kHz for a phase a/6lpucspis xq3tzh/ /o+/. rlngle 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 k 7rfu mj3w u0z;,17vhsnyln/ at 1.0 kHz for a total impedas n3,zl uf1u7/0 yk7;n rvwmjhnce 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. What is tp y6q/pho(jy 4:) pq2kvx fi4the phase angleqyq6o(/)ij 2kvpf44h:yp tp x?

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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-mH coil, nb)p*( vk;q ydand 1.0p*v(db;n)kyq -mF 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 cocrxlu p f3huwze;k0:, z2 w/6cnsists of a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuitrww0/ f;6:zuc up3xlh ,zk2 ec?

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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 Wm0/zm ;mfe af,y;t l0u, a capacitor of capacitive reactance 30 W, and an inductor fummzat,;ey l/00 f;mof inductive 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 angle for a series RLC circuit containing a qpsc9v/ ;hq aqc8)pq 550-W resistor, a 10-mF capacq;cqh/9apqs c 5qvp8) itor, 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 wi 8m3 y0*cefbdeefyi55th a 500-W resistor for a phase angle of3f0 y5 eebyedf*mi5c 8 $40^{\circ}$ 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 whatyhn()njju l75fi y 4b6 frequency should the circuit be driven in order to have maximum power transferred from the driving s) 4byyiulnhj6( f7 j5nource?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15.0 W (q x6a 6* muvq(dnnn0kinductive reactance, and 10.0 W capacitive reactance, when the circuit is connected(m*(vn66 q 0ndnx quak 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 AC ciom05gt2 /*ly 3ty6vpqz* eldwrcuit 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 impedanrg.l3t ginvk ,9a(koag;y6j *ce of 60 W and a resistance of 30 W. What is the po9k *a io,lvr kyan.t3j;g6( ggwer factor?

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138#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power factor for a series RLC circuit containinw9 pbr8a p(so7g a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to aps 8b(p9ra wo7 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-b yy(m( +h8)sf7xdz2j hj3(ad flgw /bmH coil in series?lw/bhz(sj 2ad 73jdyf (+8m (ybgfxh)

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needed in series with a 4.7-mF capacitor f22np7 ,6+po svlsxck uor a resonant frequency of 10 ksk ,vl scp27+nxop u26Hz?

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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 wmbrg 9r8xes .1ith a 3.7-mH inductor for a resonant frequency of 1000s8gb exr9r.m 1 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 40bwie8h45ydvt+azh1 5 -mH coil if the resonant frequency55 eyd i 1at4+8wzhbhv of the circuit is to be 1000 Hz?

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