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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 un2y7 u6(4 g8ck,fm smjuvcs3 suits of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states than(n m4yked9 pnet. 6a 3y: bmc6citg(8t 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 inc,w 7qr)8-xezxfmr8 xi9 q jpw/3o8a l a coil produces what kind of change on the induced /r 3wpx, f7elo qmqca98xwriz j 8)-x8$emf$, 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 o yt:9 p0:ffsl2yxx ktx27(qd qf the magnetic field through a loop of wire produces what kind of change oxstk p::fy t2x729 yd(q0xqlfn 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 change on th :: mzbw8phc2 vciiv;/e induced v/cwb:i8h:z 2pvim c;$emf$, assuming all other factors remain constant?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As a coil is removed from a magnetic fie1k2 3yeh cbu0tld 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,h(x jy)vq31;r c a+hgm the direction of an induced current in a conductor will be that which tends to agj+hhm crvq)x;3( 1yproduce 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 hel0u y 4h4*v uu8vk92wdg vcu9vld above its center with its north pole pointi uvdkgvvl 0yhu 8uu9*v94 24wcng down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above ibh*4hk4 y6 grets center with its north pole poeyh4*4gbh6r kinting down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the mc0a(jw u*8)or ey mtz*e1b,mwagnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades8joeeym ba w (cuz*t1mw,0r )*?

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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 av tihw-h:5y,s region where the magnetic field vector points straight up. The magnetic field suddenltvi,-hsh5yw: y grows stronger. When viewed from above, what is the direction of the induced current in this coil as the field increases?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a horizontal table top in a region9lb w56,yg ad2dyji )l where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the dire 9wiy5 ly,6lb2 )jadgdction 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 hori2d 7e tsm.y:efzontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from abov :m7e st.deyf2e, 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 witlfl-w pd5dx/* h the north pole entering first. As the north pole enters the wire, w*dxfll/5p -d the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis wh ps t2b 5won2n3o1gl8nose direction can be varied. In a region where a uniform magnetic field pobs1ng3 tn2noolwp2 58ints 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 rotrxj*txhgd* :mr 4 up:4ated at constant angular speed about an axis whose direction can be varied. In a regirr4hdtxp: *um*g x :4jon 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.y(o3 qvq pix8,
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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 hmygy,6l k +ol np;h1z: y:j7dan $emf$ 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 freei 6 ep c5q46e5ay;6+rplvmield. 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 moncvz9z,6:tkp9mre hqa+ / 02e6fm0 rfha8blfved northward at constant velocity through a magnetic field that points straight down. Make a statement connp v9 0f+fq6ze/k fb0,9 28mcmzr6t:alhhe ar cerning 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 constant angular w(glym s9ta yj3zc-uphn 6)/+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 cik4xx v n/ 02s6yo8hdtransforms

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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 eac sfosfr,sq8 3/tt(sp 5eql 61bh second. The frequency of tqt sfpqs,t31l b6f ore(/85s she $emf$ 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 devz sfl3hjb: c d,gwa/ks+z22e .ice used to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a devif* 77ykm 1-cq tb (tp0+oz h89l, 4eazbfcstudce 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 cont 2*ec)eu4ygdcs,)i f i7n hx9nains more loops than the primary coil t4g7xci hi9ecf2 sn)nye u, )*dhen 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 contain569izc ( ny tp3zlah)ys more loops than the secondary coil n(c9zltiyp 3h5ay6z)then 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, th- bb.a9fc:s m 06yckrfejp6 z:x7n tu1e 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 cirda pfk: *cv7lgau :0k6cuit,

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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 gx6 ok0a09k*0tbzzq:rj+ydd in series to an ideal battery of constant terminal voltage. At the moment contact iz ybj+0dx 6 t 09kz0d:ro*qakgs 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 obh* sb 3:geop6f constant terminal voltage. At the moment contact is made with the battery, the voltage across the induc *hpsb:63 ogbetor 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 mr.p6-4f epvo 0nquk7to 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 conn5yoj1 1vgw pvqmt;iti3(3*mwected 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 indujbw9l/ 31p2pwm w0peu1 yp/i q* 3nnibctor are connected in series to a battery. The time constant w ijp/ n*q3lu9n/1bp32pbi wy1w0epm 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 in serieslzc (yo+tl/3dpi9lk tp*w8pol 8;1mo to a battery. The battery is suddenly removed +od; t8ki8cl/* pm( l1oylzlo 39pptwfrom 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 un,e .w7 -pwtfmgits except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this circuit, the c5*w ,1spu6ik (njpb*-qkir xyurrent

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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 connectz;mbkv2)ndj ,r85vtqw .9h rved to an AC power supply. In this circuit, the current.hjtkzvrwv )nm8 q 9;2vbrd,5

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The inductive reactance in an ac circuit changes by hug f; , vza/c(rzvd1/u3sie1 :zum c,what factor when the frequency is tri s1ud,vh/ c13rmu,gzv(fuac/ez :iz ;pled?

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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, the inductive0sr)tg* bqkb- reactanck tq rgb-*s0)be 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 approachhvf 4r aeax 5c)9o44-od au;fdes zero, the inductive reactance of 4xfoa - u94d;4df hrc)veo5aa that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an ACehcd a8q)isa: 0 k7cp3o3p 3ug power supply. In this circuit, the curreoi3 p7k3:0) qpdug8e h3ac ascnt

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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 ch6j 1l8td,ft7 oye jrihsbj54/anges by what factor when the frequency is4f6o d8h,j j/yttblr1 5i7 jes 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 capa9l2w-awemu 5;b w0m xdcitive reac wxm-mb;2e awld50wu9tance 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 o 2o* kvc ubr7/xbx1m,e ;qxzy8f the inductor and capacitor in a RLC seri*xo1z 2cyb;8xu/q,xvrek7b m es 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 defin wk ovzeck377:ed 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. pghg 4gw9ez/1ft,g s*The impedance of the circuit increases if R increases. When is this sspg,hwf tg 4z/* 1g9getatement 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 cwtp7+ *ztl ru;ircuit 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 cirbb 6e,i +qht(a;/w rbe nfru :3,l5elrcuit. 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 capa t6w bgxjw)9i(n iwgyy4f 85m1citance both double in an LRC series circuit, the resonant frequency of that circuit willx5)mwi gyf4ty9(86ginj w1b w

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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 ap( 9l*a av9chlmc-v/gwplied 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 RL52;ut5k 5 fru1 dqz 51sfjmjmgC circuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of $4.0 \times 10^{-5} \; Wb$ is maintained through a coil for 0.50 s. What $emf$ is induced in this coil by this flux?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic fielda5 f+r )yppptf8 xzuf(gmqm (8r72 f2t of 0.20 T. Find the magnetic flux through the loop when the plane2x85( )fg mf+mzrp78fqu rtyp(fpa2t 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 magnetic fieldi;l. b tq q-iv;i3a;bp of 0.20 T. Find the magnetic flux through the loop when the plane of the loop aia3t; ; b-qbi;il qvp.nd 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 rotati,lh9qci8-b4 esvoprhp 3rm.0 ng in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic fieldv38qhsrc4ohb, 9. m-rlp0p ie 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 o(4tm 0lx. 3wd qq ,ixte0fmpf)f an adjustable single loop is reduced from $1.0 \; m^{2}$ to $0.50 \; m^{2}$ in 0.10
s. What is the average $emf$ that is induced in this coil if it is in a region where B = 2.0 T upward, and the coil's plane is perpendicular to B?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The flux through a coil cha9anyc04/bs e 0h+f iapnges 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 i5th x;:qm+yq of wire on a square frame with sides 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coiix;ht qqy+:5m l. 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 /ipr,scky*o b(. /yux4-myfnu8p ni- 15 turns 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 hfs o 520,k-4tg(cdc m1zjae a$0.20 \; m^{2}$ 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 a. uidu /ptdyl*e3 5bmyj o6*l205ojert a location where the downward componentdeldyu e3bp5j2*trl 6oui0oj*/y.m5 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 b h1a7xqp.ogqv ;t* i82.0 m long rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its endsqb.7x8*ht;qg aopvi1 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-sejrwbzsx;qo 0(is 6-.bctional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of a g1-ltqvo b3j5rea $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced $emf$.

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator has 80 rectangular loops on its armature. Each loop is -peuqb*u/.u2kjwue*. ae ; b ytjh84h12 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 ajeb8 pbju/eyh;*2wkueht- .* uu4.q 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 plxjzhh38p.8g (x e.i turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simple AC generator with an output om 9j(lgol i(ovmp1e;*f 12 V maximum when rotatedjei9g(;ov p1(ml lo*m 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 gena 1+6 8o;114lqgjgmik+msu s l yx5zsserator 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 ab 1e 3xlmc2l68e((j 12 ;xcjqfnxsilj cj; mg. 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 res dt n7v*vxlp08istance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it generates a bactxl80 7d*nv pvk $emf$ 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 n n*d d1z5cd dof3wik9*1ao;fresistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-ufn3d* fdd5on;*a z11k9oidw c p 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 suppl z3 ,p5dpt2gkby. The operating current is 1.0 Adbgt2 ,p3zkp5 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 connected tzc *)x4tm4,mrv . xb2h)qrqc8 t.dbz co a 24-V power supply. The operating current is 1.0 A at full speed. What ib) t*. vc.drmb,qz )xctrq4x24z8m chs the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is needed to reduce rg2h4rps4, 5inspjf- 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 cao5 ghi/7 mjc2(fptedes6 kr-9uses 14 A to flow in the secondary. Howgesp k-765c/ or( 9fe2jm htid 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 th0v k osao0x:o1t+nak0e 24-V secondary has 100 tuvoko0a 0 sx o:1a+0tknrns?

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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 xoh*1oa0*,mkksv r 4i67s k eb2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the curr 4v1miok7hs, b rkaex0o s*6*kent 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 transformer0fj kryyg2x1 7. Assuming 100% efficiency, f0 ykg1r72xy jhow 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 a neon sig w7k*0fc0 et0lm 8)dod wez6kyn transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. Whwd8 m06eldyzc 0*o )07tekfwk at 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 prima2l-qtpgr9 5p bh6e nf9ry coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what vo5n gqhp-le9 bf69tp2rltage 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 300 turns on ipc*f +4qiyvut/, 4a jdy2o h*wts secondary coil. If 120 V at 2.0 A is applied to the priidt4vp42yq/aj*,ychfu o+ w* mary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has ,:hyzdj n76 lz200 turns. If the input curren,h7ld:nzz j y6t at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and i u; z5f,+z pl/1p3 mu 1xkvstmg0uiez8ts secondary has 200 turns. If the input voltage to the primary is 100 V, we c pm3z0p; zlx81zvu, /fm+geutsi u51kan 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 i;+-nq p 1i07e lxwaywats secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of the secondary to be (neglect p- q+7 w0w1alax;niyeing 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 volt0 ki.g8nswsh,n4u9 5q 8rzv apu0za s0age is usually stepped up to 4500 V by a transformer and transmitted through a pow 4 z00z q 8pnh9sr0a5gi,.uwvnsk8suaer line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator producespx0kaww x72ctc23j9ps mo5 r+ 60 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 transms29 t7ac+rpw0 xkpxm cj 2w5o3ission 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.i xfu*krs11(,hzhuf* The voltage is usually stepped up to 4500 V by a transformer and transmitted through a powerx1f(i h1, h z*sf*uukr 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 resisun9/.o/o u kbnm1)fm rtance of 0.60 W. A generator produces 100 V at 70mb mfnk/19/r.)u ouo n 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 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 ) i6f.u e*j16rb aecnbhas 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 ai6 r6b)fce1u anbj.*e 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 mu7l vy(cw9/obg,bh a8hmma* 8jch less power would be lost if the power were transmitvh,* 8 og8/7 blhmaj9mc yabw(ted 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 generator is 440 V at 20 A. It is tmpoj4lrc wa:c0rtzc,/5k;-c cc:vi 6o be transmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped upp;o4ctjcc0:r/vmc c6a zk-iwc:l5,r 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/+r , k-ccdopw the coil's magncrdo/k+,w -pcetic 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 co4xe,c:qny4v l ntains a 6.0-W resistor and an 18-H inductor. What is this circuit':,l4ecnx4 y qvs 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 circuit wqe wzuf//9a.a here 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 i2u1a5 wogiw7 6 pqpa/vnto a 120-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 in 2pf 9xd4b isn3 (t/icfy)fy0vto a 120-V AC outlet. What is the resistance of the lamp9ypbx3f cni04i s2ft(/yvfd )?

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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 o z .du4,.q zc65d-fpmo2ou okto a 120-V ac power supply. What is the peak current through thz k.2uoo d do-up cf456zmo.,qe 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 ,xxlrb9m5a *dis the power dissipated in b 5*9ald xrxm,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 x/ v;x+7mt g// xubxyba 50-W resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-c gvs5o(6 r6s9kmj6cwxgke(/1z o9mlW 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 resistor ffaesn3 a2w4 5x1bk6uis $I = 0.80 \sin (240 t)$. 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-duuw: vmp8lzk135 d6dmH 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 2.50-mH coil atcx omt+8ph+x1 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 wil4m knr :stq9w 1ps, r/mfjk6,sl a 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 inductive react:t*5dru9nfr rance 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 kHlzcws;tcvx(7ohln. *-qy ;, mz is applied ttcq-xc*hvw. ysl ;7moln ,z( ;o 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 dtp+soy8(k *h; huw wmuqgx2+ 7ue to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 kkcifenj )*)l-b(- sym Hz?

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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 ca5xnorm9 9 8cjw9 rh*u.da f2fcpacitive 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 capac:ue: luqus 9a2itor 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 0.0-4q c 3iokafwcegu/0b*(- itn4 z xm66zau/ip10-mF capacitor be 100 W*/tqpo4cz-4awn ( egm3uu/b6i 6- i xifk0cza?

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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 5.0bh,mfv z2z.w,w;fm: f 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 resistanej9shm+9b qu3xmy2+cemmq 0 ,ce, 15.0 W inductive reactance, and 10.0 emymsj2+he q 0bu+ 9cq3m,mx9W 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 im/ 7om22 yefyh3 fdtbp bcc0 bu2lsy928pedance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF cap cupybfcby72 2bf l2hd92/ s30yeom8tacitor 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 Hz if a 100-W reqkb(/b,50y rj4wj zx 8pi3r)o soj*mmsistor, 20-mH coil, and 1.0-mF capacitor ar b8i4kom, )jb sp 3(ozwxj5j m/rrq*0ye connected in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in seril3.c fspp0qr2yugv4x i-6n4 aj9 5 0uutdbj:hes with a 20-mH inductor, what is the imped 4 :gpucqrnyxvif3t0p5l .-u6j0j 2absu4dh9ance 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 )y m9;jtp,iueconnected in series with a 20-mH inductor, what is the phastm,) i9jy;ep ue 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 need-s1zh ix vn(soez0 ,3ye8ixy.ed in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 Wex .(3-z1inv,0 yze8y ssoxih 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 capalyj pk5ur.r ovrl/5:, citances is needed in series with a 100-W resistor and 15-mH coil to get a total impedance of 11u r/ ,vlj:k5r.p5loyr0 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 500jeocsa6mk/d5,.fp : y0 Hz for a total impedance of 4000mopa:.jsd ,c5k/y6f e 0 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 wm5jy,9n zz3 ee *5 n:uda0jsitith a 100-kW resistor at 1.0-MHz for a total impedance of 1505zme uz ji9nj0dst ,*y:e3n5a 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 conneci:5t/.v ahm ur6wbfw-ted in series with a 20-mF capacitor. What is the impedanwwfh: ib 6-ur vat/m5.ce 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 -tu2 o9m ; lrgpufn:3.3qy,tabuwno/capacitor at 1.0 kHz for a total impedanceq ,-np9uo/2m f;unoyb.t g33 tlua:r w 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 klmjtjrs wnfp +o9 t76823r.ebHz for a phase angle ofj.9metnor8+ t 2f7p w3j6lbrs $40^{\circ}$?

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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 1.05 md5x 6byudxzaml+ra4 nu1 hic30/n0 kHz for a total impedanhny/uxm0a 5i 01 l+63nrb a54uc zmxddce 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 the phb09l)kt(ykiuc oir khdh .jmj,u e6i+6k6) 7sase 0s)ki ytik r6k6l j.uid6k9umb+j(o h,c7 eh)angle?

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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 au+ npsh+(w( rfjsvk)7 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connected in ser js+( )7huwv(pknrfs+ies?

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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 re;,.9t d.b blgezz3ehvsistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply..vl. zdhbe;t9b3g,ze What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W, and a7-p gx 74qzqnj8j i1gon inductor of inductive reactance 30 W are connecgg7j7-1nzoiqj pq8x4ted 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 ser, /ad0jt 1 k8zqiwb-m rgh*1xries RLC circuit containing a 50-W resistor, a 10-mF capacitor,t,ri1j1 /0 aqmgkxrzb8- d *hw and a 0.45-H inductor, when connected to a 60-Hz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase angle oewx5h9-gfnx8 5pa0nlej(f lj53 b)p r3l 0px 9j8bpanx hw55- gfr (jf5nele)f $40^{\circ}$ at 10 kHz?

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134#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit has R = 20.0 W, L = 20hb 5j n4 hx-18w+egdua0-mH, C = 10.0 mF. At what frequency should the circuit be driven in order to have maximum powergn1de8h 5jbua wx4h+- transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15.0or qntt6:7 b9ox*k q,f W inductive reactance, and 10.t frt6b*qn:, 9 o7kxoq0 W capacitive reactance, 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 circuiw;g zk5;oq bua279*hgcb 4kaxlq ,f+ct is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W and a resistance of 30 W. What i7*z v p8(2pljkq fag;ps the polgz f*(vapp8j2 ;kpq7 wer 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 containing a 50-W resisto vlwfuywc0r;+ c(2v9i5io k-x3 ) dcqor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power q ;ol+30v5wo 2rifv-c kxyid9w(c)cusupply?

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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 frequenc8szd6 ,*u.tqgulc,ro30u suq2l m z7 ky of a 1.0-mF capacitor and a 15-mH coil in series?s.u dslulkqz,t26 u80q ,o*cuz m73gr

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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 aev7 :r ny4)yhlg4 b0 v7fsizd* 4.7-mF capacitor for a resonant frequebsfe7g n v7dz44)y*vrh lyi0: ncy 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 wdn 8.e)r35sglpf7a ufrequency of 10g) 8nuerp5s al 3.d7fw00 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-Wlgf)a lkr. 8k; resistor and a 40-mH coil if the resonant frequency of the circl;gr flk.8)k auit is to be 1000 Hz?

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