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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 oo 8 vn8i6frx)n*8vuy lf 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 ss :xjq(+t4n2*gxc x) dz2yxigtates 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 onrtl7 j-+ jb embk26486ewgzaf loops of wire in a coil produces what kind of change on the inducedbe wab764m28n ge z jrl6+-ktj $emf$, 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 loop of ;qs zrp4qzpwnjn e.2f q/. wm/a//c 4gwire produces what kind of change on the inducedfqz wg. a 4q/ep2/sr;4 .p/nmn qwzc/j $emf$, 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 looydtmprl: e;*xa 0ff)l*7ti5 l p of wire produces what kind of change on the induc**)rli0tt; p5f ymx:dellf7 aed $emf$, 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 0yvjk yu:g 0am507nykmagnetic 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 current yrwgs(cq/fub7;1 - )auxy 9lxin a conductor will be that which tends to produce which of ub7 l-/g1cyq (sa 9)fwy ;rxuxthe 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 t)zpg) b qjmeap3 wvg,/, f/oc6(3)afx tut1apable. A bar magnet is held above its center with its north pole pointiptg )a (t/pwaxgof),uvb efm3 3)a1cjz,6/qpng 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 fau2 cj pk66aq8lat on a horizontal table. A bar magnet is held above its center with its north pol uck6a8qj 26pae pointing 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 magnet p2avq c4f)k+yic field vector points straight up. The magnetic field vanishes suddeny ) +apf4c2vqkly. 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 lca66 *mz)e,;dwd.ln(qkps f kevel table top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewe sq*n;fzdc()k,l a .e kmwp6d6d 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 region where the magnetic filvu 8g/59j jj: d/p6o ppbheo(eld points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of jgo d/:jvbh 6p8plpeu jo9(/5 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 a0 pfht-msf, .d horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced curfd0pth - .fs,mrent 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 e96 flpz 3ivrhu6(-wd loop of wire with the north pole entering first. As the north pole enters the wire, the induced current will be (as viewed from above9i -rfd 6 uhevp63(lwz)

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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 x+rn8es64 yfq3i r z ih5-vy6xat constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straightxr yf -z5v6h3e4q6+ 8nixiyrs 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;kzpr qyu0ba d*2+mi8ph/)-6 acivgg an axis whose direction can be varied. In a region where a uniform magnetic field points straight down,ih) -p6gpavm/dcr28ybqk;ag0+z * ui 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.i--zzjts ez2 1f 8xy.l
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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 and8) 6/o01kmj kao vumn $emf$ 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 field. Then(-:mo4 jp5oxjc y dg;/vf6yd $emf$ 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-+j)vzc rcg3 4ct6oa -awest direction) is moved northward at constant velocity through a magnetic field that points st+cvg -cjat4 z)a6o3 rcraight 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 constant angular velocitkg94w2ko/. :plq 2nbbnfm sg.of 8zx+y $\omega$ 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 transformga ky4h+v fppigs:p u,; ..ps4s

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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. Ths1 h-cgke ,wpuq 3d28em+mt t-a0c1kd e frequency of thq0t1t kesw gmad- h2d31mc8c-, ukp+ee $emf$ 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 dz mr79d(c -fnpevice 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 device that b8s9/o n3lu2u.o aoxy6bhy)s

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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 lowfa.stdy)2i z.x ,5a oazv 5i:ops than the primary coil th: fsyzwzx i taa)5ia. o.2,dv5en 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 loodf4e0 r*vsfaqba9di5tlq n;h v-;s32x1ltp 5ps than the secondary coil thelv2 3x bhit-t 4s*5p vs;0rfanf5l a9qqe1dd; n 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, the power in x1zre vh3+jkk*5 wit.put

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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 circuiv5bviinx m m3i4yv65g3-w v8rt,

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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 ai eh 8d*g89k)lh-xx +2o1i/aonktf xore connected in series to an ideal battery of constant terminaldxflih2/n ao9) 1 og8x+-keo* h8t kxi 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 induc*u .cni. 1+d ka)wdljctor are connected in series to an ideal battery of constant terwj*1n ciddk)..u+lac minal voltage. 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 inductan t 5v6*lkfkp16f n1tilce 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 and resistance R is connected to a4qcn 0m97myya.x exb/n $emf$. 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 inductorxohq*d*al),w o*r -vu are connected in series to a battery. The time constant *uoq*xol *hvw-),r ad 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 series to a battery. The batteryla8z7i 5 s6 swbr/qn0/ad ze-n is suddenly removed from the circuit. The time constant for of the circa8 s5znwnzab6-0d/7r/leqs iuit 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 exccupv/mfasq0+ 3 z*0uuept:

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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 curf; wy5zkx1+gug639 uvp-jie hrent

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the cu38v0*8/5* gdaegv aaz (tabdv vm0pexrrent/tvam *b8g pe8ae0( *a3vd0dzvgx5v a

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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 whatta jf z-uvqo7-wyed;) g:h, 7i factor when the frequencye-yh7gw :tj7,) -uov qia;fzd is tripled?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the frequency of the AC voltage across an inductor is doubled, the i5h ey,omrg1 r3nductive reactance of that inductor rg1 53eym,hor

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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 indu sz -z;sc)t9npctor approaches zero, the inductive reactann) pc; ztz9-ssce 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 connected to an AC power supply. In this cir6p+x4; e lmjwtb8r(l vcuit, the current lb;v w+(ep64 mxljr8t

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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 t5uxjw xd x 01ql:k:sv714 lehwhat factor when the frequenuqls d:th4j0l57ek1x x :vw1x cy 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, tht-:o ) seqku;y+wc af9e capacwoseq:;u- y+f )9ktc aitive reactance of that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle betwee9myfkrf038 g m;8y;znpq qqk *n the voltages of the inductor and capacitor in a RLC series0zk; *fy ymkqp rm;n9qf8q8g 3 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 anj4adzz*bs8jl ))v9v s RLC circuit 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 39pxbh-zxx jn1dp4*ja1z3wd of the circuit increases if R increases. When is this sta33xxpwh1nb 4z9 zd*-j pjdx1atement 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 cil8.a 9*eqyxsq3tu nh4rcuit 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 impeda2/ h*4u.7yvuhvsvx u7ypf7 q dnce of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC serh3 e*od(hh6p1yk 4 sd17e dxxeies circuit, the resonant frequency of that c4 x1ehs(ex6hkde1ph*ody d3 7ircuit 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 dr2 rpz2 *j )rgb3, sjdr5biks1siven by an AC applied voltage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occue:b 7 eb4ao6cqr ;-*wj.nexabrs 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 i67n -vcktvb+9d c s+2n l0i;fqkhfz6rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and th kk+tb2f6 0v n+;dsccqin7 9ih6vzfl-e 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 zq,h c)tll(3h50zunk rotating in a uniform magnetic field of 0.20 T. Find the magnetic fl)q0l znhu(c3zk l5ht,ux through the 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 rotating in a uniform magnw )rer 8my+w48zrq; ywetic field of 0.20 T. Find the magnetic flux throqr8w+y8e r;rz 4m) wwyugh 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 l 3 a8n1nr8ajuw7ba6u area of 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 cham 9 n6-g-vm.nxnm7g ddnges 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 square frame with sif 8xh(w)w*rq*f5ioz6p u8b8rx h+vfj des 18 cm. A uniform magnetic field is applied perpendicular to the plane of the coil. If the fiej)frhu+bxzvpho (* rw88q6xf ifw*85 ld 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 axt5sg6:s *ei * sixsjr:o* c8ind 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 andhva 30n8ebtp70ytl, ec0uvu3 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 wingf0 cs yi/af6,f span of 60 m flies horizontally at a location where the downwar /0a6if sycff,d component of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a cons8 g mz:oju+87vc8xmietant angular velocity of 2.0 rad/s about a vertzmouvm 7+ :8 8cj8exigical 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 genera8l(l t5 gv-gg dbz3n3vtor has 50 loops and a cross-sectional area of $0.25 \; m^{2}$. What is the maximum $emf$ generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire of aryj;) qd*:cj anea $0.090 \; m^{2}$ 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 looppl(b 6)z c)a( tcfl0jw 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 ow0tlz jbl f6cc)a(p()f 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 ,7d;y14mgn p4o5;vmgaxo4nt y, wsgw 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 witc5mzs xxz 00msgo1 :zf1u:sr 7h an output of 12 V maximum when rotated at 60 Hz. A magnetic field of 0.0s :r zxzu01071 smogc5f xm:zs50 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 ge1sc6jay8;;nn v,pczlf - z re8nerator 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. The motor operates kj3(f j ito3 +6uhqh7hon $120 \; V$ 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 wvbgnjvquo;g 9/; y;q:p 18dc have a resistance of 6.00 W. The motor operates on 120 V AC, and when runnig y:b cnq8vdp9 quw;o1v;/gj;ng 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 s,k xgs a7yz22bupply. The operating current is 1.0 A. What is the start-up curre7 x2 bak,gs2zynt?

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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 pok(*s 3 dp sux*ne 7 p.xq/ui,-bi1romcwer supply. The operating current is 1.0 A at full speed. What is the iu7e ,m xro-x usp3nq(./i*p*1cdbsk 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 r urjc(ca)9 gsk 88bg,yesistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. What is the bagc8(ka,)sj b gy9 urc8ck $emf$ 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 transform mp1n3ilsw/:bl0 fve3r ce0)i er 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 primary of a transformer causes8; auoko5m vh9 14 A to flow in the secondary. How many turns are ink ouv h8m5oa;9 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 i.w.+c my+l.icpk ea9m n a 110-V primary if the 24-V secondary has 100 tw m kml.ciac9e+y. p.+urns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2009gr:dz x k/o0q ajkfr4sn3w4 80-turn secondary coil. s f9qj4od0k: g/3nr zk8 a4xrw If the 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. Assumingwjgmwvn:u9f * 1.c3 og 100% efficiency, how many amps at 24 V can flow in the secondary?gjnw1go.: 9mw c* 3ufv

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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 at 10.0 fvl-pi)yd/f*b5q3mj7hv*3.p f lwot mA. The primary coil operates on 120 V. What does the primary dra3f 7.q*ip)/m3f*jyvflovbph t d w5-lw?

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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 .vy zk 06a+nb ;q7wxclrn4ax9its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary,yn;bz9ac0knqx 7 alv rw. +64x 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 300 turns on its s1 p v.)oq dvqwe,ha 6t.3dnx0jecondary coil. If 120 V at 2.0 A is applied to the primary, whajdx 6d.h,aq1et qv3 wn)0pov.t 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 hd6 :kn t (okuhko;7zeg/l.5 daas 100 turns and its secondary has 200 turns. If the un; ke.k 7/ zd6g:o5hk(oadtlinput current 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 its secondary has 200 turns. I/f1pbhrq3 7agj: )er6i vrwh7f the input voltage to the primary is 100 V, we can expect the output voltage:b76pif/gvq 1rahr) j 3hrw7 e of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary hazxp0fyii 6n :rh, q9;ts 200 turns. If the power input to the primary is 100 W, we can expect the power output ofiq:xh; tfni0y6 rp9 ,z 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 x(aymdm didmsc 99 6o.i. p)u4current at 120 V. The voltage is usually stepped up to 4500 V bymuid9c4 ampxsoyd.md .i)(69 a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage k -cwwy3+,1ym)ecd)cc pgq9 zis usually stepped up to 4500 V by a transformer and transmid y9)+p-e)kzcc 3,cgc mqyw 1wtted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is v hxtv7ddaf,1fw8 -xj5 *+corusually stepped up to 4500 V by a transformer and transmitted through a power line fa r -dd,*jvhx81t +o57 fvxwcof 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 tottyj58*otau+ h(9jy i kal resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmiss5+9 (y uht oj*yati8kjion 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 has a total resistance of 0.60 W. A gfjy2x v16q-e qenerator 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 if2j qx6ey1q v-s 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 dowyu5w,sp 1a8j jc8p/sxx 61biqn a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instejsp8x5,p/a 6bqxw 1ysc18u ijad of at 1000 V?

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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The output of a generator is 440 V at 20 A. It is to be transilj+ xcc 6(ts06q hkd(2i4el cmitted on a line with resistance of 0.60 W. To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is noxiqkc(lh0il 6e t(s+ cj42c6dt 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 5.09 g ;eqq2)llth).ai tx A. How much energy is stored in the coil's magnetic field2e gqitq)a)9t;l.xl h?

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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*0nar5xlkn+wm , ve( wuec 25p a 6.0-W resistor and an 18-H inductor. What is this circuit's time c a5rmkvn*e, 5npew+ cuw20x(lonstant?

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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 akkosq,oj;7g 8n AC 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 inn3i;ex.y94maqrbp +r to 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 into a 120-V AC outlet. What is the resish*u+0 air9q fa:awnum:u.6 outance of the lampwm:uq*ha9.f:ua6+0ourinu a ?

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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 poweeta7 gliug20mrj;z 92r supply. What is the peak current through the reim07l2zuegt a;9g jr2 sistor?

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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 1vw1zj g p.n0r)1f-cr, (zjff9 :iorjd20-V ac power supply. What is the power dissipated in the resistor,jfjz 9fz -1rij0g:rovn)r (dp.c1fw?

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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 res7:db 0- semgdeistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resistor is t4couisms*ey; m1a;rsbr+m(9 /m 3 eb $I = 0.80 \sin (240 t)$. 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 resistorsr wcpt/dg37;k9 1vyj 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 inductor at 6**cnw osb9jz dq00 chs/dzr700 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 2.5 3ovz2urai/l- 0-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 h(5vx (7k9 dc 7jjirvm8xd0x8dhfq(o e ave 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 inductump*od 7k*2o(y4v auz ive 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 A8k, b7r(xxxc7mo 2tovC at a frequency of 20 kHz is ap7,c2(8 v7kxxmot robxplied 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-V, w465x 3nr8sfn u)suzmn0 e5gv60.0 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 t,ok1wa 6s3xq xil)v3 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,bus07qh: 6 +d tuuxkiigi61 g7,vi fa 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 a reactance ofq p-tvuvhkwxmd5v/bi*9 - 88 f 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 gup mjshy)kk(/4cy1n, m3 ldp81wnk(capacitive reactance of a 0.010-mF capacitor be 100 W h3yy dckkjnn4 k)((w8mp1mu/slg1, p?

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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 819j gj1c4op41qga q xk0ys w7c0whur 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 *.hamyw;hh7pi-ovn8nd z8 f4 resistance, 15.0 W indn*ofav4m.hd zwh8p;n 8 y- h7iuctive reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1500 Hz if a 100-W resistor, 20-mH cokn1+td (pwnhc.d cc*e/m,qm2il, and 1.0-mF capacitor are connected in serim(p/tn. ew 1,2m+d khccdc*q nes?

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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 s c v.jkq9d. )6ema/im1.0-mF capacitor are connecte9ai)mjvd mesq. /6. ckd in series?

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118#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series with a 20-mH inductor, whas,;a0q+ryki,cnw0 v at is the impedance at 1ic vs;,+ykwq0aa,nr0000 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 series69gge 0pgz)ii79(d5vqa mh p munmf9 5 with a 20-mH inductor, what is the phase angle at 1000 H9gng p65 u fdiaz0()97ei9ghpm5qm vmz?

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in a series circuit with a 20-tmb 8r q++:emgmH coil and 1.0-mF capacitor for a total impedance of 10 mbtmrg8qe+ :+0 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 re(jvtq/2do cbm /o6 ,y74 yfvx;oo ljf4sistor and 15-mH coil to get a total impedance of 110 W at 2o2l 47 cyfyo/j4tmdjo, x/vb(v6oq;f000 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 ixj6(jswl)ga tu.) r 9tb86fhrn series with a 450-mH inductor at 5000 Hz for a total impedance of 40000 xbjrt6g(ua68.hjfr s9) w)tl 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 1.0-MHz for a to8mt o-2ano aocfa5 06htal impedanceona 8o 2h-foaa0tc5 6m of 150 kW?

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124#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected in series with a 20-mF capacitkx9jt// zozet,z32 usor. What is the impedance at/, tzj zktes9z/uox23 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 w q3xhs 64;jqde ;wy2baith a 10-mF capacitor at 1.0 kHz for a total impe;y64jawe;3bh x qqs 2ddance 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 a1uz fc* dha43rt 1.0 kHz for a phase anglac4fz 1 *dru3he 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 16 o.47 lfc5j 8ts8utfegj7x e* kykvrkHz for a total impedance of 45 W7e s1.kjx ffyjtr *6v8gckeluo75t84?

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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 caplabj(roy/g1wxm l r 5o*6p0f3u1v(f uacitor at 120 Hz. What is the phase an(3p r6wx rmjbv(l a5ylofu/u 1o1g*0 fgle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, anjj uy: .we(jh:82t klcd 1.0-mF capacitor are conney2hwk cj j 8e:tlu(:j.cted 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 resisto/l3* 6pywr 6 zer ewy. r)pyw1m1ad3jor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected t )*6w/pom 6e ry13zpa1l3we .jwryrydo 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, a0f2t b vw v)*:auex pqaag;2z7 capacitor of capacitive reactance 30 W, and an inductor of inductive reactance 30 W are connected in series to a 110-V v;g7wf )2u 0vz*qaaxbt e2ap:, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC circuit containing a 50qp fnz2wfa2k c)5 3pb4-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to 3)cw4 nfzpq25f p2kba 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 *u:qgni(4kxxb4gx on(n ti -v + cl.a5phase angle ox -nn( qi* ltcvxou.4bia+5gg:x4kn (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 = 200-mH, C = 10.0 mF. At wha( d ex(epdinmga-x-si m*-v:( t frequency should the circuit be driven in order to have ma--v*(d( dai xim:mepg sn (ex-ximum 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 12.0 W resistance, 15.0 /obr2/ p)mch o.tgd5 cW inductive reactance, and 10.0 W capacitive reactance, when the circuit is )ph2tcd/r / cbgo o5m.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 Aj.ko1 d5pfjl/ C circuit is $63^{\circ}$. What is the power factor?

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137#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ac series circuit has an impedance of 60 W anj +;ypy,o* qfm3q8uol d a resistance of 30 W. What is the p+y *lj3opmo8yf u;,q qower 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 factoe +c6 9at0va gzqa(i.yr for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connecte9.i0(6 cqvt+zgaae yad 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-mHd0*nqz +e *qh3c(t 3i/c*, ec kqrxegq coil in series?z0 td3q iecq +(gq hxq,*3/er*e*cnck

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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 caci 5w;w t-rp:.-n) jzf b-aiu2wko ;bopacitor for a resonant frequency of 1i-c:jzw2)w bakpt i;5n bo-w;u orf.- 0 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 nexjk2hiw5n9. e eded in series with a 3.7-mH inductor for a resonant frequency of 1000 H2 .kwne5 xh9jiz?

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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 9i,txz;j 9nr -0 ifkc48mvyd,im,hwa series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit ;adtxki r,,n, 8imjc9zv hwiy40-9fm is to be 1000 Hz?

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