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

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following are units of magnetic flux exce6g ,gf ); ,orq)rqvjbcpt

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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 inductio g(wxvq4 h:ff, sz,f8dn states that the $emf$ induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of 6,ciemnbui) 0 wire in a coil produces what kind of change on t,6 bucin0emi )he induced $emf$, 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 wir+ne+ * p+jjizrc- h5vme produces what kind of changene z+jc*m+-5vj phi+r on the induced $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a k(zgli 6p52/ ka sd4agx -lx-uloop of wire produces what kind of change on the induced 52(gas 6k --dgzlul/p4 aikxx$emf$, 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 fieleth4sq7yooql / i8 0e 3pwzf e)458pnhd 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 c95 xfvvac/u8f urrent in a conductor will be thatavff u 5c9/8vx which tends to produce which of the following effects?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horiznpj k8fd l z/jh*0x4e0ontal table. A bar magnet is held above its center with its north pole pointejn0kp*/ 04 x fljd8hzing 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 ef2e7 5 5o6dun-t twpdon a horizontal table. A bar magnet is held above its center with its north pole pointing down, and released. As it approaches the coil, thd57 pdwee ount526-tfe 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 thrc,b8 hn/g 0q i2(pabgqpts2 *0kpju8e magnetic 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 fiei tnqgurb0gck b /p hp2( 8a,8pq0*2jsld 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 p9g7qsmdb(4jf t: mc2wf /zppj w (6k6top in a region where the magnetic field vector points straight up. The magnetic field suddenly grows stronger. When viewed from above, what is the direction of the induced current(mgtk64 qf9b6 jmd cfp(ws/ zpp7w :2j 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 horizoz 0 tljb00xy8:a8ti ka) pro2ontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the dire rpbz:0jk)l2o at o8tya0 80xiction 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 u5x1a tzo0hw- on a horizontal table and carries an ever-increasing current northward. Two coils of wire lie flat on the table, one on either th5z xaow0 u-1side 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 thcew iqg.i2 j44rough a loop of wire with the north pole entering first. As the north pole entee j.iiw44gqc2 rs the wire, the induced current will be (as viewed from above)

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an a1 my,. osxd(kcz4 se+ok6qmoi ; 8l5tnxis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's1 xm, c6o( qzltn ; ed4oikso8k.s+5ym 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 bda, yrc:d(b8rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points stry8a,ddb (c r:baight 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.rk) e. 1ydej; rizz(;f6htar2ei(q8 w
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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 th pysl ;/+xib6eapy 2-vat an $emf$ can be induced in a loop of wire.
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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A wire moves across a magnetic4 0x+3gnnq+0eibx zbu field. The $emf$ produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west dired3ku*, raj6h*qg46tprz+ o woction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potential3ht* oa qdz ,*or4kurgw6+j6p 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 velovn37:d-f la 7tccfii ;city $\omega$ 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 transformz8;dpgai esxuw vst k,;,b +.2i z,mt9s

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator coil rotat/ptcbtfa gp5s8s0o1q2r z k9+otw1wqy :65a ies through 60 revolutions each second. The frequency of ts2:8p9ckz t/ aofg5oa +p 0 6tyqi15bqt1swr whe $emf$ 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 usec4mpuywuat1 v*zsj)6*vh;3 s d 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 dev)vr664gimrcwu-qoxn)8tr c - ice 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 col 0.3mz( +mpowoa w az9r0zyn z7s0rd9il contains more loops than the primary coil th (w09la +pwom9zsnd 0r0 .a3rzzomz7 yen 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 7-nbju5 7qf:gdd u7x bcoil contains more loops than the secondary coil then it is ad7xqbn 5u 7:g7 d-jbfu

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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 inputp v8ytk4p.2vf, z/p0 zuhuan:

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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 circ; xp5 9j66eyb fl4nns5qoacncci: /r(uit,

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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 5ht h6egy3v1lseries to an ideal battery of constant terminal voltage. At the moment contacth1gv3 h6 elt5y 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 connectedlh )6uhp/-*gule uyjor)j0t. in series to an ideal battery of constant terminal voltage. At the moment contact is made with the batterye u0rlht-pu.o/ )u *l ghjy)j6, 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 r,ke57 gj +kfarz ,q,dohlm ,xwzrb*f)(h t0u; esistance 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 icvtc u,l/n8s+t: c ji3s connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to a battery. The tims ngt7vej x :kl,fbn-bw1i67w/0hl 8r e constant f/bn8n1fx v7 hkgebwwl, t7i r6-sj0:l or 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 batteo cxw *gjqs*:oa9kn 92ry. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time re9 2:9*ga coxkwsn jq*oquired 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 exbu44 mafhei. t 1h8lv9cept:

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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. Ooxt:cyzpj/ *;ck * gm+n 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 A5s/9q 0w,sr r8gfqv2odov4smC power supply. In this circuit, the currenwmrs,rg f5 2sv90o v/8oq 4sqdt

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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 what factor when the frequen.lfwy;;cgi+ ) abuw9qd he()7ej o2kn cy is w;akd).q;g2n9woc+eih( 7)y fulbj etripled?

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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 in(zgon .)sde(s1ia5osductive reactance of(zs).ei5dg a o(s1ns o 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 2kg)u9wvj 1at 5si b *m,wond3an inductor approaches zero, the inductive reactance of t 5wug wn tbk13mosi,a* )djv29hat 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 po 9 isflz gaq7u/2/sn2swer supply. In this circuit, the curre 7iluzs2aqs /29 /fsngnt

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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 factor whe 2stcm((6t. ;eubf kwxn the frequency is tripled?x(c 26kfte(. ;wutmsb

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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 calnt + d /obix 3+)d-oflj1lobpwd**v :pacitor approaches zero, the capacitive reactance j 3/)1 ll+p +*o:x*vtfddlid on-obwbof that capacitor

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle between the voltages of the inductor ye7 nilg873koand capacitor in a RLC series circuitn 8 l3io77ykge?

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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 defzkca,ya hyv(/7p28j-tu-v ye j 4;o diined 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 impece 6y 7pdn/ puav5huwcw* 70-xdance of the circuit increases if R increases. When i 6apvxy0ch7w5c/*-uud7wep ns this statement true?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedanc)fw onbp l7y0(0fgzv,e of the circuit increases if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series ci/+g2/pr; a nx m+ixd-srojwl4 rcuit. The impedance of the circuit increases if $X_C$ increases. When is this statement true?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the inductance and the capacitance both double in an LRC series circuit, the otui-:6(0bexjoqkvq+ p f 9+fresonant frequency of that circuitj oub opi9+e:k0qvq+(x-f 6tf 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 tr71r2lhv ;u rk1; 4squ iqjy(that is driven 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 o-1:p q5 )/m 1b1 ltfrlbdeipaqccurs 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 field ddcmjqnd,m)vl:h-5bv h ; *z+ of 0.20 T. Find the magnetic flux through the loop when the plane m*q-)hbv d 5zcd:mv , lhnj;+dof 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 magn+4eb oan3 /t2i9 to;s1a95ewachxr4mw oc j j.etic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field;swa toeb9xj9a4w4+ o 5/2n.o1c ajhecm it3r 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.nq sy9rq(lv9xk 2 ouxn6 wl6:/10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetill/ 9 u9oqk6 xqsnvw:26(yrnxc 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 u.r9wg)irrru7j6x f* 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 changw(de.ac o;1qyes 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 snx ,sq1f, c3e0o)nf oaquare frame with sides 18 cm. A uniform magnetic field is applied perpendicular to qnf31 fe aoc0s,)o,x nthe 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/g dpl2;1a axv60fh 7(f. 4mnakcnndk 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 area57t3 w rvc9lrb $0.20 \; m^{2}$ 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 horizo) tikdy/3q(b nntally at a location where the downwa)(qtkn3b / dyird 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 lg0l:w e8nsb 6cc r0u5hong rotates at a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fields6 gcn5r0ubh wel:08c 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 andbci2d2ne8 j*f 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 tu yd h9nks/41eprns 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 $emf$.

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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 arg;s9q- oqzb :gmature. Each loop is 12 cm long and 8 cm wide. s 9gzq:o-qb;gThe 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 maximum output voltage of this generator?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An AC generator consists of 100 turns of wire /y 2)c sr-gmnzms/cb g7x2xq: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 of 12 V 7xu0 b cj2p0(xakjw4d maximum when rotated at 60 Hz. A magnetic field of 0.050 T is avakda(2uc 4070j pbwjx xilable. 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(if+ q hj od9t4pb0ec7 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 mo7 smh4vpn*ayyq-.m , vji 0rp-tor 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 mot1sw awue6 ov gvkwduo)p68: 5*or operates on 120 V AC, and when running at full spod wk6sow8ugpe: v6 15w)*a vueed 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 internalmjb.1nx g5 lu+ resistance 6.0 W is connected to a 24-V power supply. The ope+b jx. l51mugnrating current is 1.0 A. What 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 resistog 5 +3tow 6z3njsgdx/ance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at3jgowz5nsx63t /g d+o 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 to a 24-V power mu-czj zh4dds1s9w )fy;)v0;w k*rf isupply. The operating current is 1.0 A at full spee0wk f *)yr;jfw)dz;hs-vzim uc s4 9d1d. What is the back $emf$ when the motor is running at half speed?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A step-down transformer is nee+tr+vpx3ajpr+p 5*v bded 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 causes 14 A to flow in the secon0i l8lr9mgxggt v 7-9pdary. How many turns are in the seco7gt l8vp -mx90gg9irlndary?

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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 hq+z8i1jbt/-y pqoj b 976:oof fnj/nturns are necessary in a 110-V primary if the 24-V secondary has 100 tt://ojn q 9y1ojihbzq8+p-nb6 fj7ofurns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 500-turn primary coil and a 2000-turn seconda/v)qbw2 v nu7ery coil. If the current in the secondary is 3.0 A, what is the current in t7b/u eqn )v2vwhe 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 socws2 ac .b+5in the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flo+wcs 5s a2.ocbw in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transs3 se:i:c-( jfj hgg8+r;dwrnformer provides 7500 V at 10.0 mA. The pgjnsi:jr;rg+ c-3:s hdw(f8 erimary coil operates on 120 V. What does the primary draw?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An ideal transformer has 60 turns on its primary coil and 300 turns on itsol3o1:lska/zd *f y s v(g/n+j secondary coil. If 120 V at 2.0 A is applied+1/zds3:*olvjlg /y sa kn( of 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 ak3ei ol+/:06n r uvxei; ol8hznd 300 turns on its secondary coil. v3;eil0 /o:k8le6 zxoi uhrn+ If 120 V at 2.0 A is applied to the primary, what current is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transfoen,2p cse2e+ o+4tyjn rmer has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect the output current ae pno2cny,2 tej+s e+4t 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. a2 tkzx56a ryc(z6.:h:bfk us If the input vo: t(5r:z.fc6uaaykks 6 2zbhxltage to the primary is 100 V, we can expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 1p*;d xgykr/w z22wt2 k00 turns and its 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 (ne/2 2k;tzkpr*yxw gw d2glecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage ka4.s(*stcbh s8g q;d3k7xuw fj0qi 6is usually stepped up to 4500 V by a transformer and transmitted through a tfbdg(kwssqshi603 *a8k. ;4 ucx 7jqpower 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 Vo(3.mek cr j6x. 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 loko3(e.6 xjm crst 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 p5,xf mw)n3 u)bkdke) ;8fpbyA 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 8 kxf)w3ymp ;nbp5e k),dfub)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 linencb t (lnt :/l9t,dnati6v:t / 50 km long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns dtt, ilct9bn6/l:tnt :na( /v 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 3.:c:c+ bbg.sio ,ivn u0ernzkm long has a total resistance of 0.60 W. A generator produces 100 V at 70 A. In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ra3:+ecu.0.iib nb oz,n :r gvsctio 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 transmittedzo vj4*dm q)w-l)r9 ae down a 6-W line at 1000 V. How much less power would be lost if the power were transmitted at 3000 V instead of at 100ml- wrj) q9v*)dza4eo0 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.r56uf:6l qxmqwiab.4 It is to be transmitted on a line with resistance of 0.60 W. To what voltaa xm 4b:w66.5fqiulrqge must the generator output be 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 curreng p*9*7biw bynt of 5.0 A. How much energy is stored in the coil's **wg 7ypbnib9 magnetic field?

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95#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple RL circuit contains a 6.0-W resistor ac0 jxh *8;vyk7c;ud wqnd an 18-H inductor. What is this circuit's uxc8k*;jd yv ;0q 7whctime 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 g/d,wrz km1s;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 intoqtr/2p4 9a d:v2p bscnvhm, o( 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 resistancv9)j 7 ptayd6b hb*z(3p4k hgee of the laeg)d 4ak b 3tbp*vjh9yh (76pzmp?

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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 s-hy7 ugw6 g,bmupply. What is the peak curre ghwgumy76b, -nt through the resistor?

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100#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What is the po)k.y .ff ss3power dissipated yks. sfof)3. pin 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 resisba+2oac f(jt) kw6r y7tor 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 2paqnl+hc-:wke 8;gxis $I = 0.80 \sin (240 t)$. 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-*i 77 :zngk6abi 3mcjbW 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 inductor a-72a.p/a oebp8(3iyggzdak o t 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 at 1000 x2l6*i(t uh8 qft-praHz?

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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 id: ;-im7p) m4opumkn jnductive 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 inducw,4zk )q7nd nb1hx7 i* g6ggtqtive reactance at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of -kch +t zdb q nz(t/vs8*fea8020 kHz is applied t0 vc* tdeaz+ fsntb 88qkh(/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 2.5b0zb gcswas)uz n7 2070-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 r3wq uo7k+inok, c/qm3 eactance of a 4.7-mF capacitor at 10 kHz?

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111#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor is needed to have 50 W of capacitive reacta 6 tlrv*dxe*6cnce 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 of 1207zcb8t1 ddxq9 0 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.;uzt* fiipu 110-mF capacitor be 100 W?1iitpu * uzf;.

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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 zckq; w-5nm9v7-cq q xHz 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 Wn+*h -bbwk-j,qfij)x:v*k w x resistance, 15.0 W inductive reactance,qk f*i)w:+wn xk-bbvxj,* jh- 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 coil, mrram b4zl6g2*(5 qytand 1.0-mF capacitor are connectedg2mr5tlqz may(*r64b 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 ruz ) zlkyds021esistor, 20-mH coil, and 1.0-mF capacid u)0zzl2syk1tor are 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 coau53n;rl7lae t4k;jbh r 5eobj 9syer,s j2:9nnected in series with a 20-mH inductor, what is the impedanceb5;lr : 3sthaj72b e4yler9n, a;rujoe ksj95 at 1000 Hz?

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119#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a 1000-W resistor is connected in series withd 1w ;bw-a,2aokbw 7eppt 4rcegom(,7 a 20-mH inductor, what is the phase angle aw,dw 1 kego7m,b(orcp-2ba; e a7t wp4t 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 c v l7kjd/*acp8ircuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W at 15d*cvp kj78l a/00 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 resist0r;ie+n)xjrtj..-dks k :tw6lpf 1 vak (8wbuor and 15l (.x+ 1ufw:jatdj0-)w6eikpkbv.t rk nrs8;-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 in sern u- 0e:iec4mp+n lvd1ies with a 450-mH inductor at 5000 Hz for a total imcedup0v:+ nln m e-4i1pedance of 40000 W?

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123#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance must be put in series with a 10m7 . fsu-8k-bz5wfn4cai hhry -*f lbqnw(t0(0-kW resistor at 1.0-MHz for a tota (-ftqfh ibahc4r0nybms ( -5 z7w lf8-*k.nwul impedance 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 conng + 7d8d.cvffnx1q2qp ected in series with a 20-mF capacitor. What is the impedance at 100d8 nc.qf+xvf21q 7dgp0 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 f;csg4mh81df in series with a 10-mF capacitor at 1.0 kHz for a total impedance ;c d81ffh s4gmof 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 capacp dlirz t6fg.+b4897ykzbe/ aitor at 1.0 kHz for a phase angle6f+ dib/. ze 8tp a7yk94lbzrg 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 resistoau rp f/cnqim 6/exrs73f)0)br at 1.0 kHz for a total impedance of b 3fr)7aex rq/i0nm 6 u/sp)cf45 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. i 7h.r:spysu,;2c bxpabb5m, What is the phase x;cb7pbp ush, b,2sm 5yra: .iangle?

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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, antepo v-diec; 6k e323zd 1.0 co- 6eed 3p;ek2ivt3z-mF capacitor are connected in series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W r2c7zzw1nb,gfp * zgm. qcyz kxja:)/ .spj+;eesistor, a 10.0-mF capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz powcyjb7.gk, ze*apms:.p)q c /n;+z1 zfgw 2zjx er 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 capacitive reagl9 ra9y5yyq 3mqif8r 9;sy4s ctance 30 W, and an inductor of inductive reactance 30 W are connected in q995fmsr y98qs3 4ryl;iaygyseries to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a series RLC;lwud i36 ibj/jzs5w6 circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz power suiwwdj b365l;i z6/juspply?

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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 pq6lvkm 6q+:g500-W resistor for a phase angle of qg6lk+:q m6vp $40^{\circ}$ 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 p.*d* ;woiwty. At what frequency should the circuit be dr*w;d wtpyi*.o iven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in an ac series circuit with 12.0 W resistance, 15.0 W q48ntj5ddwz-y -7rv-2:ryh5 i 3(k evkgstsbinductive reactance, and 10.0 W capacitive reactan(i bv5ez7hydj g8rqd5 k tt -4y-k2s nv-r3w:sce, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC circuit irmcr, n)g ;w/gzek3,h s $63^{\circ}$. 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 i++0b+4y+ zv rsy ffdjkmpedance of 60 W and a resistance of 30 W. What is 4kd+frzf y0j vs++yb +the power 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 co72t77 yms(5boulit q u xo:lv)ntaining a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hb( o27)q 7m5il7:toutuls vy xz 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-mHv/ e 2gmvo cph.,uom+q)9zh 8g coil in series?2v )cm oo 8.egp uh9qgz/hm,v+

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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.* g dq61lszqk97-mF capacitor for a resonant frequency of 1 qgqd9lkz*s6 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 f/7eqy;ri xe7c requency of 100/ei7 rx7ey ;cq0 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 pljjg,x 2;;b3vwyt-yd7b7lm44 syjlh daced in series with a 30-W resistor and a 40-mH coil if the resonant frequency of the circuit is ytj;b 3m74 -j7dg 2svdyj;4xl hwb,y lto be 1000 Hz?

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