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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 magnu6:94 yei xtotzhr x82jrp2. xetic 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 stamv t1rjm88n)b tes 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 b4zjr; hn5y 4xof wire in a coil produces what kind of change on the induceb xn4yzr54 jh;d $emf$, assuming all other factors remain constant?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the strength of the magnetic field through a loop4fpd yte:ql /5 of wire produces what kind of change on the induced :d5/yqpt 4lef$emf$, 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 wha5wgxahaw * 69rt kind of change on the inducea*5 xwg9 rah6wd $emf$, 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 magnezvr0j 5k 7,1*5)w gh dyoufabetic 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 ak-m;tnlnk vz.p9*hkdo/ +cq t, r **xpn induced current in a conductor will be that which tends to produce which of the following effectm/; +tn* h,.lvpo*dpx -rcq*ktznk k 9s?

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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 heldsqtf u+ ezj +c1zp0vh5z4gm0 1 above its center with its north pole pointing down. The statios epmhqz jctzf1+u0 z 5041vg+nary 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. A bar magnejo2a/xn e37nhi i 5hb3t is held above its center with its north pole pointing down, and released. As it apb5xe/in 3ho jah 7i32nproaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magnetz8*hy *xsiql o7dc5 ,nic field vector points str*idqsl5* znyh ,c xo87aight up. 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 region where the j;rnfi bp ,e5sg4:h 7w*nnmw +magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current in t4e5rmi 7 ; p:bs nnww+hfg*nj,his 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 q2yft f2pi/ ,ca region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disapp/2c ,f2qiytfpears?

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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-increasinj le e6(rt qp1jh61q6ttoeu:/g current no(toh6 q: uq1 r/el61tep 6tjjerthward. 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 thu-d8 g ke86irkt5gmf fk5 lx92rough a loop of wire with the north pole entering first. As the north pole enters the wire, the indu-2xmur ld8kkk6 95g5ft fig8eced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whotjxm+*cil.l,u -uu,3gc5 l 6iyud 9hmse direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of thlt*u,jy6lmu3ug5im-9c u,.+ xlhcid e 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 br1n:m. xx( 2;rb ehvyy n7g;faxis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation.r; xxg1 ; ye(nfrb7ybm2vn :h 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. 7)tb /rv)i,js1lz wlb
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
State Lenz's law.
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
List the three ways that an q9 7((s)mqzfd5yntvt $emf$ 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 fi:sl1iqvkkkm8;sd .) veld. 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)a4hfz-zio. e-ojt b,( is moved northward at constant velocitoz4-z(jbf,.at oh -iey through a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar rotates at a consthoe b48 r8vvk,7qgjq(ant 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 trk t+ p5rk+lb4z n4d(4d3pfdiv ansforms

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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 ren3*vhk4+ fs4 . lutp9z+z hkzevolutions each second. The frequency of thekzp l4zfhu+ n9t4* ev.+zk 3hs $emf$ 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 usz0:lr ir5x qb6ed 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 de6 j .q7ylru y8sc;5 lglh4j xs6ye)3htvice that

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more lu(mn .:ufyh 1foops than the primary coil then i:1ffny u.(u hmt 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 thj 9gj xf*w,.srh)b mio32 f,dee primary coil contains more loops than the secondary coil then it is ae3.fg om)frj*9jbh,d,sx i2 w

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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 p 4- zuf f5/ ;l9qllv9c*wspflkower 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 circbe-6 i87)rse t:y 3lwilrcay9uit,

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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 seri3.d ndwzd,f*s:cq r4fp(cc 4e es to an ideal battery of constant tdfd. ec4s3d rc,4cpf*qnz:w( erminal 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 ba,s wc+t u0.qdwealz8-ttery of constant terminal voltage. c,ld.e-zt8qa+ w ws0uAt 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 connected to o0trv4cjm,.:*ffya s an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the inductance is 2L. When it is connected to the same $emf$, what will be the final value of the current?

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RL circuit with inductance L and resistance R is con)- jsud s58(rcohdba /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 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 con/rgg6 gcqwtkv59 kh/9 nected in series to a battery. The time constant for the circuit represents the time requhqgk6c/v 95rg 9t/wkg ired for the current to reach

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in seri7b1c ig4oe ph2es to a battery. The battery is suddenly removed fr1bh2i4 po7ecgom the circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units exc0hmx/ hkde8o .ak 0(wvept:

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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 potttkc 2( ( /pbp8zcz3tyc k;0bv p;p*iwer 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 wg pe0p2+la1 ae43cnjAC power supply. In this circuit, the current 2lpae a4n3 0eg+j1wcp

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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 a)cqi q)mso(9qqetat5 4qxn;lydb 58 nse5(y 1c circuit changes by what factor when the frequency is tripln )5qo)lsceqenyx t( a5;y5sqb 84d(1m tiqq9ed?

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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 th43dl23h qpfme5j kl: (9dkqb je AC voltage across an inductor is doubled, the inductive rmhkll5q 3p d(2fbjkjq9 d3:e4eactance 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 inductor approaches zeroga/lfsd 7 9y -)e,*bktxe nq46fs:xdqy;om* f, the inducti -d*x: tm; 7fd4*qsfk,exfbnyolaq 6 s)y9ge/ve reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is con pd9crvoe hm;bbk-/- dmj 6w53nected to an AC power supply. In this circuit, the currentmvkb69- bmd;/ 5-dcwh3rpje o

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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 facto,sfesmxi---w7 nj vl,r when the frequency is trxil,s--snj f-evw ,m7 ipled?

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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 capkw st;o vd1dxilbsulg::8 701acitive reactanv1 wuts8l0blokdxi:g7s;d 1 : ce 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 volta1ruc sdx-w8/ 6qblnwd k0+m-v zm,/dyges of the inductor and capacitor in a xrn8mq-udw 0dwv+dbm 6ks cz-l /y, 1/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 circucpf dnu0 c03+tq4c ln;it 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 impedae qn b1zkf1f+w*yatwf-3 pi,9nce of the circuit increases if R increases. When is ti1 kaebz+f*1qn, 9fwtf3 -yp whis 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 impedance of the circuit in9tz5nvv 4h nmemdr+k+nea n- nz419u*creases 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 impedawgz :mx/r7qs, nce 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 th7()y+x 59/sokn jeyvu . 1wun7dtzcr9y dkpp3 e capacitance both double in an LRC series circuit, the resonant frequency of that ci99p7ue 7py vr5udd(k j/ kz. y)n3xy+nwotc1srcuit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied voltage. At reso0 -6my 8pyviw/yqep)tnance,

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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 wh0 dy:hf;fpr1e e/9g hsv00fhien

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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 radiusf. niq-atx.pgbz n cbrs4)/,5 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux througqnn 4ra i5cs/g)- pz,bt.f.b xh 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 x(:t0 lwre- 6lmka4 pn8lwq )n;i, t6srlwgc+in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the pla 6i4: wr,n0tawlplgm8el) t(w-ks+x; n lc6qrne of the loop and the magnetic field vector are perpendicular.

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fiel.yk6t*vu jsw.m3pzb g*a-e3oaa 9o(do0ig8 l d of 0.20 T. .9 de6p u8 o0o.ywa a-lgjv*oabk3 si3(*gmtz 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 sik+ r,r6)ybbjo5szk 7qngle 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 change))tekbw.h/ zv s from $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil is wrapped with 200 turns of wire on a squa).a ti8 oo*mvure frame with sides 18 cm. A uniform magnetic field is applied perpendicvtumi *ao.) o8ular 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 arek- c7qfyu) olh)3 +whlq 7(jdoa 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 an;c3a4 uehc. 3 4mabmqjd area $0.20 \; m^{2}$ is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane with a wir l- 63uu7i9mksfe,jrng span of 60 m flies horizontally at a location where the downward componenur,7i smr6-fk9e3j ul t 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(*dp8qo*k(hg ak5 a* lu2bryg is 2.0 m long rotates at a constant angular velocity of 2.0 r adb*qy5r8 gkhkou(*2(*p a glad/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 cross-gqru(j o-bo.ob 37v2vsectional 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 wi(kirmnd 6p8 b*re 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 s .sc9cbfh /bn4k6roy;6kfy8*wnfr il (ip5 ;its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maxlf;f65hi6c8sr*b /c4ywb(p ikr.9ny ks fn;o imum 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 afya pre y :pmcbk90b+pmw8j91 2h)qg9 rea $0.090 \; m^{2}$ 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 generat:p3,acphbit ,.c mr8bor with an output of 12 V maximum when rotated at 60 Hz. A magnetic field,:bhaib mc8p.3c rtp, 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 maxiap. ,.cltzq7z8hu+a 4 yq mh4emum $emf$ 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 We1)pdl.) zfonvunq4a 66 om :r. 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 motor operates onbj u3l.8ee6ow9 ta6be 120 V AC,3b6tulwe6o .9a8e be j and when running at full speed it generates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V power supply. xh6 bme w;,l.+o4govq:m7nio The operating current is 1.0 A. Whabg7vohn;mmoxq 6+.: i4, lew ot 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 connected to a 24-V power supply. Th8d *a*jh97mtu +qc/jws b,wote operating current is 1.0 A at full speed. ub 7+/h mct9oq*w ,sw*ja 8tjdWhat 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 ayfb).u88e wzu. k0ysconnected to a 24-V power supply. The operating currentyzu)f y8 aksw.. 8beu0 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 transforme*cvpt)h(be6x7f jf 1mr is needed to reduce a primary voltage of $120 \; V$ AC to $6.0 \; V$ AC. What turns ratio is required?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  2.0 A in the 100-turn p)6m hk-h)j3,c2b ,d dfdorjie rimary of a transformer causes 14 A to flow in the secondary. How many th63hme jd -ddik r,b )2)fjc,ourns 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 turnsnq5drf,.6ybi)mj m d9 are necessary in a 110-V primary if the 24-V secondary has 16m,id9.)frybnqj5m d00 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 500-turn primary coil and a 25eo 16e:paa yl000-turn secondary coil. If the current in the secondary is 5aao:p6eyle13.0 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 transformeij1 os:6 lj8hksio):cr. Assuming 100% efficiency, how many amps at 24 V can flow in thi6 :s:ho1s8joil)c j ke secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transformer provides 7500 V ; waeg xsx.3e;at 10.0 mA. The primary coil opexxw3ge.; s e;arates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil anty.9/cn.y xz3i5asdjm8 tp/jd 300 turns on its secon yy d5c/at i/m3jjz.pn89.xtsdary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and n;+.2wyl ssj h300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what current iswy+hl 2 sj.n;s present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 2yk )u+arxy6gr3+: qbw 5ayrv300 turns. If the input current at the primary is 100 A, we can ex6r5x gvyya 3r+w: )+3uqkybr apect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns 9; v.wenr5 ieyand its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of;v 9e i5enyr.w 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 secongy* t4nlm*t3r b6oo 7hdary has 200 turns. If the power input to the primary is 100 W, we ctylht** b6n734g r mooan 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 u5 f 4awkjsq/96uswn3A 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 number of turns in the secondary if the primary has 20kfqs5 4 jnwa 9wu6/su30 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 cu) :a rtvbnvu*(rrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through b: *(unr) vvata 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 of current at 120 V. The voltage is usually stepp7d +,s(: wfhjjlwx-t hed up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not steppedsh7l dhfj(, w-t+w:jx 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 hixe9xfc sk..yr6-x t4bhg6kuma 5f9 2as 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 rf26et- 64uc9bs.yfgi kkx5. hx xma9 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 resisnq7z t1pmwmyiyu2 ,29i/ uad4u u,e:ltance 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 is lost when the transformer u9:7ulmy2npt/ 4,a2 iu 1miwz,q euydis 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 wogvjo ,. 7frwk9uld be lost if the power were transmitted at 3000 V instead o79 w .kvjorgf,f 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. add7u lv 7*ury lwe8r-vf1m;:It is to be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output fad uu- m :ll 77vyrerdv*;18wbe stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is stored in the.c(c.g;d+ +yfdoxf tb coil's magnetic fid tfob;.(g+.+yccd x feld?

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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-v k9jgo; w(nz3* h ph2nw9j-p:rtij6lW resistor and an 18-H inductor. What is this cir2 p (krwgohj;ht96wj:lzn-*9i v jp3ncuit's time constant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC c2 *yhdoaxf)+3 wmop+ circuit where the rms voltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 120-V AC outletsu jdl3u1*j5/ qv bf1n. 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 int z q8(l r+u2.;jrx4blq)gsb dxo a 120-V AC outlet. What is the resistance of the la s4g.8xluq 2r d+rq;bz (xjb)lmp?

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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 th gr*5fsb6 i6ave peak current throughr g *f6iva6bs5 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 12c7;*bv8 6ipnqxs bb id*q p3p9-2jrdo0-V ac power supply. What is the power dissipatejb6vspcp*7rd9-dqn xqb3; o* b2pii 8d 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 resistoqbw j 00mpz;o:r 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 5(ax3v)rrvfuhp 2u 0+. yiv2 wg0-W 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 5s 10dqw0pma+ m7 c:doi0-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-mH inducgj7 +krsg flt: gi)/p1tor 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 2.50vcv(u/ v f0+ie 8 vxiv(rx/3yf-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive * f iukeym* f-jn5-2(qem8l vu woz/2breactance?

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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 reactancebvn4 1v5 6c)ckqxvw4fng-o*-ap rus ) 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 fre eh4l3 l(xg+3rruodq(*qd )ozquency of 20 kHz is appliedq(o( l34 +*hxzdqog3lr) eurd 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 throt jjxoil 69pg89g ore9)75z kvugh a 2.50-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 1xg j/vx ; .7d8oalmu wg e7v x.1se5kuxib5a990 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 ofjfntp 17l8bt9 capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have e 4xre:fa6 /ffe+ukgou t6/ 1la reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF capacitor be 1i /dvf(ie0ytq v1ie7: gm8 bl100 W 0t 8dy:m7( il1e/gvb1fviqie ?

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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 thro-lzj vkst -k8rsy6r j-1t28r yugh a 0.0010-mF 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 resistance, 15.0gas b gld7:fqpp-, :i9 W inductive reactance, and 10.0 W capacitive reactan9,g pdb- l ifsp7a:gq:ce?

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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 x ls jev y)n4w4h0u.6xif a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in serv06yh .eu44 nw)jsxlx ies?

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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 1y f0)sr0 bh pq+fd2/kv.0-mF capacitor are 0 b rvfp2/ f)+ksdqy0hconnected 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 seq3dtep uh(y3r9n3( kgx vf(f8ries with a 20-mH inductor, what is the impedance at 100kgv ehxf n(3 (uryft8d(39p 3q0 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 serbl*ve1e k,(ff ies with a 20-mH inductor, what is the phase anglebk vflf*1, e(e 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 in a series circuit with a hxdpj blop f-)6t g)o14nz;k4 20-mH coil and 1.0-mF capacitor for a total impeda6;n-l bzk4)pxo1 fjphgtdo4) nce 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 w w;pu8lel du4d g-0rc4ith a 100-W resistor andwg u0lr4-pced 4;u8ld 15-mH coil to get a total impedance of 110 W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put iy silf5q1w+ 1 5gra)rwn series with a 450-mH inductor at 5000 Hz for a total impedance of 4w r1gi + wy5laq5s1rf)0000 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 iet860zp q4dp put in series with a 100-kW resistor at 1.0-MHz for a total impedance of 150 kWz6pe pid4tq08?

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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 20rp.y8h)*xvthp , i t7ky-z /yl-mF capacitor. What is the impedance at l,y/ipp7t vt8kr y-.hz)hxy*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 at 1.0 kHz for xh, .z1og)/l csps dw0a total impedxh.1dp)s/ ow0s ,clgz ance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz fo 6xmid(/ eob9or a phase anxeo(i/9 6ob mdgle of $40^{\circ}$?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for a qkw7f 2bry.5v+rp w3 ctotal impp c rf.v2w7b wyq35k+redance 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 hhq5 ur3 il ukt 8vsg-9*sp/h*100-mF capacitor at 120 Hz. What is the phase angle?rp5 khh*sgs3tl-*h u8/9iqu v

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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 :qv dp25qgqv v: pds:9Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacig9 :::vqpddqvsqp v25tor 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 resistor, a 10.0-mF capacitywhp(a f/ uis+m dje8::v( )/giiom 8gor, and a 0.350-H inductor. The circuit is8:ao):h ujp+mmgiedsiy/v(igf 8w( / 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 capacitivhdf6) gncm21c 5zpd*oe reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. o5dn*mpc 62dzhf)g 1 cWhat 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 circu4+c nwej d01kpit containing a 50-W resistor, a 10-mF capacitor, ac4k j e1dw+0pnnd a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W mjc+ghn 8z80+ ufqr:d resistor for a phase angle of +fhc0jn8udmg: rq +z8$40^{\circ}$ 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 mx ,hcdr9 ewhzq6lu33*F. At what frequency should the c 3hhw39l6r, qzd* ecxuircuit be driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in wi)ffumpal 6 nv rj2mx+099q + 5k+rvuan ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connecvlw )+aimk fj6 +05rnrf 2uq 9xm9pu+vted 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 iss0w*xsg u5fl+ $63^{\circ}$. 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 oqp7sv65 1 q1nh8vcsv ei,zzj)f 30 W. What is the power f 8vpvi q q7v1ejs6)1szh5n zc,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 circcnocfvf/1) lf6 s+ f7n/v4uhl uit containing a 50-W resistor, a 10-mFo17)n/+ lnfs4h /6flfvcf v cu 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 hydb ezy), *u8 yt8aiulkqe+jw)l*+ s33 :jcgin series?):h)ytkil zq*wau eu ecd bs8 ,+33 y+*gy8ljj

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140#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is needo1we 3fctwn5k1q+ jd)ed in series with a 4.7-mF capacitor for a resonant frequency1e jwwc)dok35n1t q+f 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 inductos4 v5t3+ ldypqtz/n3jr for a resonant frequency of 1000 t 3 v54tl+/zdsy 3njpqHz?

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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 40-mH co6aou7-0djcf.5 pbvk8e(k jae af 8yi3 lx 9wd5il if the resonant freqf78a(d3ok8ip6-c v0 y e59dj.ujk fe awbl5xauency of the circuit is to be 1000 Hz?

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