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习题练习：Physics Unit21: Electromagnetic Induction & Faraday's Law
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 作者: admin    总分: 142分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月20日 21:29  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flb 13.idrznfbj+ . jzx3ux 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 induq)mtun 1ukb +.ction 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 am5n:u ,og og.bjuja,02*ss fg coil produces what kind of change on the indgso g*jugo,s,.fumb0 j na :52uced $emf$, 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 magneug+j.,ybz4v jtic field through a loop of wire produces what kind of cha vjuz.b,+yj4g 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 -ssb8;t2 wc(ga5mvn 9 d*f*fsnb -vldproduces what kind of change on the inducas(nvmn v bdsfsc t-*5b9-l2f8d wg*;ed $emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magfaht*.2v7yf2 7irsa oud9mt 8netic 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 induced ct8bmf3k bk8 gy 1u4lp/urrent in a conductor will be that which tends to prog p ykm818k lub4b3/tfduce 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 tj8 ;3q -wfgdi .8rkg8yfyf.+wd,j1 a jbeu9 biable. A bar magnet is held above its center9 u q.giab-ji+bydg8wf. 8f3 1yr;fwj8e,kdj with its 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 ta8ij0jlh++ sax e43kmable. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, the falling magnet h3a+mj+sli e 8j k40axinduces (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 f yo2e-cw.ih tda h/67mield vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in t h2/ecm6yt7oah.di- whis 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 tvktb +/y,c1ma level table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from+tm,k vytb/ 1c 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 top in a region e81mnw s7z)eh i03jkw where the magnetic field points straight down. The magnzswh )k1e 83ne7 0iwmjetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an eve ,gpbdtk6wkji0/9+ yo r-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wirpk jb+w k6,gy9i/ 0otde. 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 thrd8q+ q.wqtt3a r/.o onough a loop of wire with the north pole entering first. As the north pole enters the wire, the induced cu qotq/ntwd8 .ar+.3oq rrent 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 yt 7- ;f;wnnbrrotated at constant angular speed about an axis whose direction can be yf;;n7 rn-wbtvaried. 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 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 about an ry:fr7tk) xobfh*);j axis whose direction can rkt)yfb*jrx; f7h):obe 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. b 2l;jhpjdl08s:+q bv
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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 thatpbcv -2vml3x if 8waz*)2o) vbq/4hqa 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 z:n;rhk9y l a)magnetic field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direcsiuf 4(j :ox)+jkki a/tion) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential induced aufj /xkjis:)+(4a oikcross 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 ri 3+utinb ra3z58nqm7 otates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transfnjh:- f2+xi9 wiiva/j orms

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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. T foc0 ajsak*5w:egezd95xi .;he frequency of the5a 05i9egdc o;wf * kz.je:xas $emf$ 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 tgvtu vu -h96z7aapr.)o

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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 1fex j566i i ;imjby*xthat

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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 tyl. oe-2dmw *;n rrqs;he secondary coil contains more loops than the primary coil the-r w.;qy2*s oemnrl ;dn it is a

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the primary coil contains more loops tln-aeolqb / 1,han the secondary coil theol -qen/ l,ab1n it 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, thesa4jmdwmnwra8c9ex6i 8v: 9uk m;3; e power 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 cim 7bpqz9 zbc(e+jvyoga 6-*4orcuit,

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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 (a lf1myi vq8*q1eua2an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltl 1miufe 1qq8*2y (vaaage 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 conn3fr+s+8 w89 zy/vgl biat/ yjnected in series to an ideal battery of constant terminal voltagelt 9r /ajiybs/++g8v n8f3zwy . 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 inductaptp(joze4--,b 1 o2xa ohhx:mnce 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 an f-/; yr vc7p,jkovm7dd resistance R is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductorn+-kze 0 n(1b6lj(apsm)w :8ui odtrq are connected in series to a battery. The time constam8ol n6a+(z n(iw)tqj srbde:k-1up 0nt for the circuit represents the 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 are connected :.kl k) 0o(pca yy4fkoin series to a battery. The battery is suddenly removed from the circuit. The time constant . oyalokckf ( :kpy)40for 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 themnoap ;6hf*k)lvgg 7i,k g/4y same 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 tozf2(q tbvbr-:qk)ad)uke3gdox: /sg a 0y9q1 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 supplyokvrwl0r 17 0oqwgp :8. In this circuit, the currenr glp0 qor0ww:8o71k vt

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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 . 7 lps2cibwhgavw7 w0jw/-w* changes by what factor when the frequency ispvschw.wl2 jiw 7 ag0wbw7/ *- 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 ib9ryxdwidjwrh9:1/- hhek .5 m;b *fx nductor is doubled, the inductive reactancej/x9by-ihrhx heww1rf b5dm*d ; .k:9 of 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,cx1 p1dbzd wxspk42 r4b+/ti inductor approaches zero, the inductive reactance dpz +ptxrb2x1 i1w4/d,b4 cs kof 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 connectedr )-k1atah6a7/ qqaq v to an AC power supply. In this circuit, the currenrqa7q thkaa)-q/6 av1t

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The capacitive reactance inp lz 8t+13ccmb/i q,zj an ac circuit changes by what factor when the frequenmjt iczcz +l8,q/b1 p3cy 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, the 94rmz2 p, y(im a(cc q8kajg,ekub-q:capacitive re:(,m9z4 kcq8 ie2k pa -raj ,ymbgqcu(actance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor ajr6cowh:16yl .u l r.lnd capacitor in a .6lurlhr:lwo yc1j 6.RLC 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 circ uara8qldl *7t.-+nciuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increases if R vaysu/n:hz9/ increases. uy/an /:zh9vs 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 impww)zo zu0gbbl/8 )amr4y7n o 8edance 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 ofc z3sy4mc mx b4;n)hw; 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 LR33evdu*qf+5+v56 cysan lk muC series circuit, the resonant frequency of that uf356mlv* 5 s+cu+qy nd3vaekcircuit 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*r* ,0kxi 9ypq1 mgffs 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 whe i ja-v(p.vz9zjn-*ty,ksod5n

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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 fa.uoir v -2m1of 0.20 T. Find the magnetic flux through the loop when the plane of the loamu- ior.1fv 2op 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 magnetifo/9qen f+/xbiv k4iy-73p hzs28q if c field of 0.20 T. Find the magnetic flux through thebq3hpk9e o8iiyn+/7x 2vqs/- i4zfff loop when the 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 o5p2nd n+3sd/ bu6vag rotating in a uniform magnetic field of 0.20 Td23 6npsv adn+o ug5b/. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single loop is reducebryqg7u :p5tl5wegdi m/22mz 1p7u d,d 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 from -ccnh5iq9-g 8k 8; is/)qzmf guh1pqs$4.0 \times 10^{-5} \; Wb$ 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 y,9g4a2 u;*boepf7y5g6k*nkiqld f ton a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of fy4 l;9d5 nkog iu*ey7b* pq2a6tfgk,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 andb9 aw6.dc* t/qv:+f9v,f cit u qdyu)t 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 e1 jz2)xxh /wyarea $0.20 \; m^{2}$ 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 1+ vl3gow1f71xgunsb apm +pl1l 35bkog,0vb flies horizontally at a location where the downward component of the Ea7l11kpbo 5n3l +0gbpv1xob w1lv,gfmag s+3urth'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 consuaokciw (;u ve.77s l2n jy 4fihn5;jtmu*t-9tant angular velocity of 2.0 rad/s about a vertical axis throe nth ; ia9yn4kuv5*j.(2 lcu;sit mw7jo-u7 fugh 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-ss:h g80tc89av)v45sa hqwf ivectional 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 ofc c yuw 7tp sac*9r82j9fckxd:kz.4* w 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 armature. Each loop4njj6r r:2r y4jgn ;cx is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the lr:26;nrgj y c4r j4xnjoop 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 hkfi(.1cssm7 n8 o m)cof 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 simp e3+s3xw d,mnp1gsrf 5le AC generator with an output of 12 V maximum when rotated at 60+fr sxndps13g,m3 we5 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 f b.td*voi6l /ex15lw with a maximum $emf$ of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of $0.030 \; m^{2}$, what would be the frequency of the generator in a magnetic field of 0.030 T?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor have a resistance of 6.00 W. o.arin1vz 6 gc-18*x rli i6pfThe 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 havemwjzk,bm 5-c,ezl h53 a resistance of 6.00 W. The motor operates on 120 V AC, and when running at fulcjh5,,ke-m3bl wzm 5z l 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 interne0i kp/3z- 5d9th96 lko uabwbal resistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the starlk3b/eap 0 i95h9o 6ktu-wdbzt-up current?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power suppyk0ssq 3 vy. 5 qsqf30ixhws ty(*1e-wly. The operating sh00yves- t*i wqf13wqsx5 y.3ks y(q current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connectedd+v 5johd w.lzu01 i2x to a 24-V power supply. The operating current is 1.0 A +h x.51zjuwv o2dd 0ilat 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 reg 6joo0i4u09ut tmhd )duce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn primary of a transformer b;voqu3.pgn/vbopgu8hb 2,;2h ue m 5causes 14 A to flow in the secondary. Houbq8phh.u2b vgve,ogm buo52 pn ; ;/3w 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 primary if the n8( 9xgegaxbtz ) i.0i24-V secondary has 100 turns ge.bxzi)ga8 9xt(ni0 ?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn secondaru ubg6hqprd8u /)2.bgy coil. If thu)ubdg82.gr hbp / qu6e 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% effiz4v.7lp6 ol pkciency, how manyll7vk6ppz4. o 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 a neon sign transformflqm,sfelw;k hok+sl3hd kx) +ef8);) y 7vp 3er provides 7500 V at 10.0 mA. The primary coil ol)h ,lo3+wkvfekhs x7) 3;ld) 8fyq+ps;emf kperates 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 p1q7, y r+xsmc+s lhu9crimary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to s1 mh7lux9 +ccyr,qs+ the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primt+i v;vyej8xkgbb 955twpd 6-ary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present iwvid5-ytxk8j+ b 65t; be9pgvn the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 th, ug8upr yiddf whdv k:69 6fi/;.ct:urns. If the input current at the primary is 100 A, uhgfw,ch 8.yt:: uk 966 idvi;r/ dpfdwe 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 10 6w.yba,+*qz ndmoq( x0 turns and its secondary has 200 turns. If the input volt a nx*wbzmq,+qyo d.(6age to the primary is 100 V, we can expect the output voltage 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 ta m5c aaa4k5ub(n98s secondary has 200 turns. If the power input tu t5aab a 4nm9a5c(ks8o the primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stex 73-rxo5pu gtwv2hfq3gol9 0 pped up to 4500 V by a transformer and transmitted through a power line of totalplr37v h9f 3xgou2-w 50qotgx 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 curr66 ljumc86nf8(v p:y ege6xpo ent 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 percef6 jvloeu (6pmc6 y8epx 86:gnntage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stulk2yw(w ghn/b *m. jv)2igz)epped up to 4500 V by a transform )/(ngw* kmvh2y).w2 izbgjluer 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 stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W. A generyu8te5h0ipy 9ator 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 0 9ui8phyte 5ywith 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. A genety/ *b, ,lxvkerator produces 100 V at 70 A. In order to reduce energy loss due to hey,xv kl,/ *bteating 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 V. How much less power wo rfy u:*cg7r2muld be lost if the power were 2r*r:mu yg7fctransmitted at 3000 V instead of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a genew 9bybpk s9o.(mp.r8 srator is 440 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 transfos 9 .b .yp9wspm8(orbkrmer 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 + dueo.yxb4 ruz/b :6gof 5.0 A. How much energy is stored in the coilguebxz .4d 6:ur/by o+'s magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W ressy.+c o4 gmh4jistor and an 18-H inductor. What is this circuit's time cons+c4s y gojm.4htant?

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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 rmoac*1 )f jf5vps 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 peak curr zqc(u2-qu u-lcc4zf 6ent?

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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. Whaee*23q qyqomk ( gmd9,t is the resistance of the lampg q,k3(2mo q9qymed* e?

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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-b+jjlj yq q2*m2qr1e+V ac power supply. What is the peak current throurjeq qbl 1j+*+my22q jgh 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 120-V ac power supply. What is e1j //or 6zvpvi+n731qbzc wvthe power dissipated /ibwqp 7/zejn vc+ 1o6zvrv13 in 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 res2 b,6: 9)4ml) xhst9zwxchwaywnte q4istor 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 50-4s5u lmc/,9 zvg p*lgdW resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W - i1*etbqg9daresistor 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 indq( ioc29e8a0txe g-mjuctor 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 o f3iwy ;ntae*9uhq+v 44yhvyyy:)7ae f 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 r:joy xtc 9l:) gye;n9of 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 necessa 41 y*gwdklyg,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-mH inductor when 120 V AC at a frequency of 20 f6,x)fmko iy**xiez,kHz is applied e,*k) x6 xfyfi,iozm*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 110-0q 3duc8k/-iqqijhbf7bt e,pg c z); /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 c f o:nhcb0-:i7,xufmi apacitor 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 re0g(dx s9z xkgm(df+n(actance 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 capaylc/v7v :dotirh *( hj, ;7ocwcitor 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 capacitive reactance of a 0.010-mF capacitor fn917enybrc8 m x,aq 3be 100 Wmrbc qy nn8aef97,1 3x?

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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 Hz and 5.0 Vfblkkma;jg vu -t 9er8i4*b(6?

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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, 15. veyv*j;g .lm g) 3:m(u9grl yktxb-t*0 W inductive reactanctxm ;-tv9 l3 jgbyy**:g.kel)um(gvre, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at gkx +5n+i(hnz cn0xtq3+ad zcb .:- vt1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitn(t0 xn d v. 5gkcq bn-3+zith:cax++zor are connected 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 1500 Hz3ugt5bx 24hcy if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serit 4 2uhygcx53bes?

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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 inductor, what is the )a 3m)q2y19wu dgt).yv *sjrmtvpz-uimpedancz )* duq3mvvpg)a.tt yry91sw- )jm u2e 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 i(nmx) w tijs 5rbdn7 :et5sm*7s connected in series with a 20-mH inductor, what is the phase angle at 1000 Hn 7*7(ssx) wdj5 mnirm: ebt5tz?

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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 f id;rv pye+ary194o2a 20-mH coil and 1.0-mF capacitor for a tota;1ryy av9ef2 r+o4 dipl 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 with a 100-W resi/,ql)qnwj eg1c hu,qxy 8 wxd:a(s/*nstor and 15-mH coil to get a total impedancq(xe ghd qwa)*s,:nqu8w/j y 1,l/nxc e of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz for a -9 372 bkg14br7u4kdcockq:sunhbe qp8w1 uc total impedance of 400 2dbs ubu4 r-3qku1e7 oc8 ncgk:p1bhcq47w9k00 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 100-kW resistor at 1.tsm ik fqprg(lx t.bw: -8ue-*xgu;;)0-MHz for a total impedance of 1pgb8fgt;.uk- x-*wu;i :qxrs t)m(l e50 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 f4-kmcy*6kr f5gejr:gg 8m0d capacitor. What is the impedancdekkgrfj*r:0g g68 yc4mf -m 5e 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 capa v5syki16cvbyo3 5 cy6citor at 1.0 kHz for a total impedancvbvyc6y o15ikyc3s 65e 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.ajh4oj49zszn-m bp . ;3syot a 10-mF capacitor at 1.0 kHz for a phase angle pt.oao3bh4z;ymjjs .s- n z94 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 i sn4 frg*0e3cun series with a 30-W resistor at 1.0 kHz for a total impedance ofc40se* u nr3gf 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 withnx-ks v6;4etsw w4 xhm6:1hav a 100-mF capacitor at 120 Hz. What is the phase anm6khvex a ssx 4-1n:46wt;vh wgle?

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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 annqnn7i di 73u4d 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in su 74i7n qn3idneries?

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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 oj7kl +oo -yq;hf a 100-W resistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connecy;k o-lh+7oq jted 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 ofx;khu+cv cmsbw+/ -6q capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circk ;bm 6vu+ cc-+x/shwquit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50-W resistor, krt/bzt3fb *9a 10-mF capacitor, and a 0.45-H itz fb kb3t*/r9nductor, 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 o4l/m1ptw hhjx 80q6y a phase angle ofl6jh tqm1xo4hpy /8w0 $40^{\circ}$ 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 what :2x32afurjyu v(pun* aqc73qfrequency should the circuit be 2n *j ay :qx2c 7uuuvf33r(aqpdriven 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 12.01dj0j y -( ,yhsfn3 7jejbhc4e W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactancebh jyf(,3djej1 4e h7 y-0sncj, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit isuya j*-7n: c4o oduoown2m3l6 $63^{\circ}$. 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 of 30 W. Wha5 com 2z-7b,;gnpnbd,7c e xlet is the power fm7gc5be ;beo,x-ldp 2cn, 7zn actor?

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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 fdkfr8dagp*+/ ks/1 wrcuit containing a 50-W resistor, a 10-p/f s18*f d+rdag/w kkmF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in s.a8 30 f:rf-wifwceejeries?rw-ej wf0ff8 3.ea c:i

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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 for a resonay:la qpxb;g -:nt frequenc:q xly;- pb:gay of 10 kHz?

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141#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 3.7-mH inductor for a resonant freq:l3f) 7 njd)l:xvl ydcuencyyl7l:3 ) dvj dx:)lfcn 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 iny,bm1pne0zf 7sg3- p:*knx1n v)sz cl series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is to befnke 0 -nxs)n7ygp:3cp 1l 1s,z*mvzb 1000 Hz?

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