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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 excepd o7- ,m3dbyqlt

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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 that trx2xu 4, u4ab9li6bithe $emf$ 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 wikptm t(okui2n 4uru6)88:j u e m0zp+xre in a coil produces what kind of change on th: p8t xmkj)8 r2p zun4+ u6k0e(utmouie 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 wire proanpryl jg4(15 duces what 1pgyran4j (l5 kind of change 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 ozv oo9 m/cjdq6:cu*z2 f a loop of wire produces what kind of change on the induce o2dc9m/:qo uv*zzc6jd $emf$, 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 fi(9hv af0:i+s3v,v3xtvl/k, l dkwd wh eld 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 directiei oz /lr326clu l3b,hon of an induced current in a conductor will be that which z ol/, ehclbl6u2i33r 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 horizontal table. A bar magn+d546 xnuj mdy 0lq.2bche(c iet is held above its center with its north pole pointing down. The stationary magnet induces (when v(de2+juh c4 q0dby6ilcx5.mniewed 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 abovepud/gilq -h+9,8oer c its center with its north pole pointing down, angu+h crq,ol8dp- /9e id 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 wx +fr6igrb(b ,here the magnetic field vector points straight up. The ma+rrfigx 6b, b(gnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a level table top in a +mqb 5kb0 m,k .gxhi;lregion where the magnetic field vector points straight up. The makmkbl.5+bghi0 ;qx, m gnetic field suddenly 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 ho +c5dj)fzjdz.)6m ht wrizontal table top in a region where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced)m.t)zj f5hw j6dc d+z current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal/bs 9b u*9a*2*usigwxfdc1s e 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 currente*cufsbs wda*9*ius x2 9g1 b/ 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 with the north /(sa fb/y6 sdldrf q4,pole entering first. As the north pol/dd b4fqrf l a/,6y(sse enters 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 ab1ied*muel 5 s.y+ w/is rotated at constant angular speed about an axis whose direction can be varied. In a region where a uniform m mws1*ayd+i.u leeb /5agnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced $emf$ is to be zero?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of wire is rotated at constant angular speed about an axis whoser/jg;eiak g pn9* aw9. direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if t9j g*w.narkp ;g/aie9he 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.a0a.o6mn (a gmayvq9 8
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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 a .fayq2da4.+ lu,+gb :jxbou ln $emf$ 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 magneti6r od;//uoq+1qzcawcc 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 cf 0y9 hpvnd0vqsk(o3a-. 7nm)g agbknb r062 in the east-west direction) is moved northward at constant velocity through h rcnmqk 7 bo9d20s-gnagb36y0v 0.v(knpaf) a magnetic field that points straight down. Make a statement concerning the potential induced across the rod.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal ba;i+hisp0 ;j xn 331u :jsqmao9;uudjor rotates at a constant angular velocity $\omega$ about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The $emf$ induced between the two ends of the bar is

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electric generator transforms(b x yc(l-eemh1la ,9u

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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 th w) +yfwucx0h4rough 60 revolutions each second. The frequency of theyw c0xhu+) fw4 $emf$ 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 deb)rw q6ak)um6vice 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 dmwb oqsaw ; l9j84lkd/87jc7eevice 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 contain qql4 a0t0orvm 6+bi0ks more loops than the primary coil then iia4o6mv+ kq0 qlbt00rt 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 mm;,* qwwg2 vdbg87yxcoil contains more loops than the secondary coigm;bm*g8 x vd qww,72yl 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, the power v.l g ox)v5t16bi ;lw,4fpid; *m qkdtinput

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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 circutis 9b8698 mjko.fxw oit,

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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 af7w*1bqjpa k/7 hn.gfre connected in series to an ideal battery of constant terminal voltage. At thek1.fg7wpabqn h7 *f/ j 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 inducwtcqti*jy+cz(fp 9wpl3 )iw.miy++ 9 tor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the vo9qii9 t lwz( )+wcw +*ptcj.i3m+fp yyltage 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 inductancjcvl+tj .:-g(2mt v e2ezwvzv()9uqse 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 Rv6 *uxq(eon)kdj+4(.g.4ma vfe p gmv is connected to an $emf$. After a period of time, the current reaches a final value of 2.0 A. A second series circuit is identical except that the resistance is 2R. When it is connected to the same $emf$, what will be the final value of the current?

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected )2df m 3idbyc+jkwx94 in series to a battery. The time constant for the circuit representy k c2)bjwxfm34d+id9s 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 tgwkqwexdz31f*f 49( wo a battery. The battery is suddenly removed from the circuit. The time constant for of the circuit represents the time requixwzdw*9(kwf4q3 1 gf ered 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 q0r .gert 2z d*iw0n3ounits 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 txy. n/b wd01pphis circuit, the current

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure inductor is connected to an AC power supply. In this circuit, the currkg.imdq26n ;t j))fhken;tiqhn k)m6g.fkj)d2 t

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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 fy;fxm0 bjcj17:s-q zs8o j ud2requencyd0yjjcs jz-8;x:b 7o1um2q sf 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 z0x b) vftnyjrrc *6,t*.j. judoubled, the inductive reactance of thy6unrcz),bv*jf .*t xr.t0 jjat inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across an inductor approaches zern,8l ,uszzxq6i:q0r,f dra4 to, the inductive4: s06tna ud,l,fr rzq,xqiz8 reactance of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC pow hz8jg y hl(u5t zs0yh.n7c,5eer supply. In this circuit, the currenn5,lzeusy ( j h8.5 czhyt07ght

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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 whe9feeb+s)x1,upigkfv w ,q1x ( n the frequency iss)uxfwp,1 ,gefe i9+(1kvqbx 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 t 9r/63/n-vubodlt ibrhe AC voltage across a capacitor approaches zero, the capacitive reactance of that capacitvrn- b/tl9bo/r 3du 6ior

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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 a yhu2id- obsvxf zf).ln.s,t4 jz*2z0nd capacitor in a RLC series circuit?2 t ,. yjx4-z.f) l0nhs ovbzuz*if2sd

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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 dmu1oldqu jq::(b sqqc.k.y6 + efined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit n*u/d udn k.(pincreases if R increases. When is this statement true?dudn p nu*(.k/

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increase(3zi7 r6b kwyevv,wj 6s if $X_L$ increases. When is this statement true?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC series circuit. The impedance of the circu t a:zd(z oabzi.;*hnu; 22khjit 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 capacit u8ea*n5a/dzyak qp:3ilgi : .ance both double in an LRC series circuit, the resonant frequency of that circa:z:3uyq5gki8npa/i *. ealduit will

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit that is driven by an AC applied volq6cw5w27thpy h. p:pt tage. At resonance,

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Resonance in a series RLC circuit occurs wapjwk-ku y -8)faf*/chen

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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 rotati6be-*br5 uxywng 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 field vector a5bbr6* x uyw-ere 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 rotatfppuv3)j1 a kf1b ,qq;ing 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 field vector are perpendivq bj;p3f pqku1f, a1)cular.

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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 bps* 7fgosmfg vm-f:1j057l muniform magnetic field of 0.20 T. Fi-mp fbfvgs s*5:lmgfjm71o07 nd the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of $30^{\circ}$.

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The cross-sectional area of an adjustable single looph u18r;.51lszg9ms fnf0 hjofc9paa . 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 chs)vd-d pqk fdel)b)zunp 89, 0anges 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 sqbeq8m g0af.x-uare frame with sides 18 cm. A uniform magnetic fielgq8aem x0.bf- d is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0 in 8.0 s, find the average value of the induced $emf$.

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A square coil of wire with 15 turns and an ,fl +kv r/bpf8hnkyk; o,g((karea 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 aokbtmq5hiws3:0 g4)b rea $0.20 \; m^{2}$ 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 sp0 ;jxkc: vcy3x :4hkrdl6af3 dan of 60 m flies horizontally at a location where the downward component of the Earth's magnetic fielr30cxk :34k 6jxh;dla: d ycfvd 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 constant ani-6zlgeo0r n4 66zt piytc+j/gular velocity of 2.0 rad/s about a vertical axis through one of its ends while ig - tl6p6z4t6+r/oz0ci e yjinn 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 generato7 zp/gy 3fyhw )v11fuyr 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 area/ex pihxg5;)vy(3g x b $0.090 \; m^{2}$ 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 i(b0w(un8 g z 19mbed9nux.ictts armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be th uug(mtni0wn8d 1.b9c9zx (b ee 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 t2q17 *f0mw0czfr zor0q* qtkcurns 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 wi)4 47rw5,yslc 3jdbevd d.lnv th an output of 12 V maxis5bnl 3v7d4j4w .ce vyd),rld mum when rotated 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 generator wib;h0 8tr ;kcbdpg woiy *qf:hr5)u7v2v luw71th 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 0uz5l s/tu5-emn;5gl3a :lnmm bhmr.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. co9mko. z b/y v2gyec6jnh wg2/y*6d)The motor operates on 120 V AC, and when running at full speed it generates a b)6 62 be*gky9 gcc /o mowj2.hyynz/vdack $emf$ 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 w:e +--e6hhjufcg5q bn- sbz+supply. The operating-+6nc sg5:h qjzwe-bh u+efb- 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 resistance 6.0 W is connected to a 24-V power supply.f6g oitp c5baf8.+iag 0 cu51ei,eiv/ The opera,+vaip5eiget0f1aici / b6.5u cof 8gting current is 1.0 A at full speed. What is the back $emf$ when the motor is running at full speed?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A DC motor of internal resistance 6.0 W is connected to a 24-V)xj 2,4w)jm 9tr nkxog power supply. The operating current is 1.0 A at full ))twg x rxj,j2k49n mospeed. 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 needzg;q+kke+n2z6 00 v az0 9rj n,mwlrqwed 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-turuhdl(.+pwt0 9 -h8-xiyrleznn primary of a transformer causes 14 A to flow in the secondary. How many turns are in the sp n8 .w-hdhlt+zl(x0 i-ruye9econdary?

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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 ;;kh cjx.dnqj v9vr 5.many turns are necessary in a 110-V primary if the 24-V secondary has 100 turns?;cqrhj.nvjv5k d; .x9

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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 szniia*s 4m+i n3 gn6s1econdary coil. If the current in the secnis*m3 i a+gz6s1nn4iondary 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 dt 1c d0zcv747vqxf3k a transformer. Assuming 100% efficiency, how man0cd x3 ft771kzcqv4v dy amps at 24 V can flow in the secondary?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The secondary coil of a neon sign transdzl3 +wxe /f+v q2gauy./mp; vformer provides 7500 V at 10.0 mA. The primary coil opera. gvepma+ly/z xvf;w2+3u dq/tes 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 itsw9+r 4 nlxays0 kd*+qi primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what volqn9+*dl0s yx+4k iarw tage 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 thls;7y:- ekjjx0 pi q5a99ow hurns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what cu -yl9:pj5whjh7ka9is0 exqo ;rrent 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-/rctl)3aehy / s cfm-g hn7i) has 100 turns and its secondary has 200 turns. If the input current at the primary is 100 A, we can expect i hg)a7sc yh/-m)rc/l3en- ftthe 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 10tb7,hbw zpeo06 .8,vjr bclo50 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we cat0r56v l8o,zcbwo, bjhe7 pb.n expect the output voltage of the secondary to be

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary has 200 turns. y/x2g lb,wx/viopr *nj ndi17os*s/ 4 If the power input to the primary is 100 W, we cas// wi/*4dprl xgjno1n7i *x bv2,so yn expect the power output of the secondary to be (neglecting frictional losses)

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usuq6df vdhddqd: m /),l5lea/6ially stepped up to 4500 V by a transformer and transmitted through a power line of to mei: dl6fq//hq6dd5 lddv a),tal 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 is usual25+z5 k k.uvux.mos xfly stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percenta vz+ofk.5xu u.sx52m kge power lost in the transmission line.

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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually stepps;9z :wiyhvk.ed up to 4500 V by h: .k;wz9vsiy a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission line if the voltage is not stepped up.

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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A power transmission line 50 km long has a total resistance of 0.60 W.w-* udzub3xp7e s.0n z A generator produces 100 V at 70 A. In order to reduce enerubep.7 d s3z-u0 z*nxwgy 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 has a total resistance of 0.6:fi zn/imia5u:7o pe60 W. A generator produces 100 V at 70 A. In orderp/:6foin ueai7: 5zmi 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 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 transmittem,e/w; lxy5iufm i,( pd down a 6-W line at 1000 V. How much less power would be lost if the power wermiyxf/i(;wmeu l ,p ,5e transmitted 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 v-ohula3/-+ ,i xp1 a2ibt.fj9w kthwis to be transmitted 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 9 a,3 bhh-vxklw+j-otatfii 1/w2 p u.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 muccyfre.rt26y*5 z p v927 q5bdwsvwo1kh energy is stored in the coil'vze6wbypc 5ts2.5ordqw19 fry v* k2 7s 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 and an 18-H inductor. What idafkm v /ym1.,ue6tp*s this circuit's time con* t/61.aufymkem,d vpstant?

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96#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the peak voltage in an AC circuit where the rms vvn;hcph; s/ 5loltage is 120 V?

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97#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 150-W lamp is placed into a 1209buoq sul(9*ne a2x y2+lxz-w-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 oma.g(2:vdo153g,m hzov+ locvwb5 z AC outlet. What is the resistance of the lamp?v13vd go,mwbo+.z ca(lgho5:m5voz2

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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 14zfmf:c 7n :iz20-V ac power supply. What is the peak current tmzfz :i4 7cf:nhrough 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 suzvf5ik6h-98cd qpl x +iy5/ gupply. What is the power dissipatef-55gxy/ul+kczdp v q 689hiid in the resistor?

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101#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W resisto2/+mes1cod if r is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50-W /hndu-f o3 xd .dvj(z+67 h1bxzd)foiresistor 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(m5 6hdrm8 ezv 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 inducto.;,q 8 x8:ut6hse1kq q7 jehvvamaak:r 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 reactanf3s.jaa wfj 3-ce of a 2.50-mH coil at 1000 Hz?

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106#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will a 14.0-mH coil have 14.0 W of inductive o+0( cdot3ojriggh slvlh1w . l29*x2reactance?

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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 as uqa)ho5 .y71 3yzxayi k;gzwc5.*rreactance 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 frequen/qd .(cipvhv 3cy of 20 kHz is applied/v.i c(hq 3vpd 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 : tzq yq14qqk8a 2.50-mH coil due to a 110-V, 60.0 Hz source?

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110#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the capacitive reactance of a 4.7-mF capacitor at 10 kHz4-kk6)m n6izl by+cke cpgsq bv6i 3(/?

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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 ohw:g((9 d imhs6j0v yuf capacitive reactance at 10 kHz?

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112#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency does a 10-mF capacitor have a reacta)mp:tnh7d i)a b 0si)bnce 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 react aqf5 g-1cwuw.ance of a 0.010-mF capacitor be 100 W?qfwg.5wa-c 1u

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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 j;e7 j0vr+y50tqb tkc1000 Hz and 5.0 V?

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115#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the impedance of an ac series circuit with 12.0 W resistance, 15.0 xli mh bnnaaf1b1.jgm0, f496 W inductive reactance, and 10.0 W capacitive lf h0a nb4mb1ij,f .mg691nx areactance?

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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, 2 9bt553jz zsqw0-mH coil, and 1.0-mF capacitor are connected in series?bjtq95 z3wzs5

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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 1.0-mFm- kuk9 /x.k kcz,nv2l capacitor are connected x.vn ,luzk2k/ck9m k -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, what is the f j9mc 7m(5y+ vazzhf-iha7zf(m m- y5+z9fjvc mpedance 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 with a 22mcjh/ s/qg,9ou zyp,0-mH inductor, what is the ph2jp /z9g,ymoc,qhsu/ ase 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 needed in a series circuit with a 20-mH coil and 1.0-8km etawdf944sp(3rn.* z 5e3w qq yxcmF capacitor for a totalqtdmn3.*e48 srxk 3z5 qw wa e(4cyf9p impedance of 100 W at 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in se)4a(u ,s1n q opr/ zw;ro(qxkaries with a 100-W resistor and 15-mH coil to get a total impedance of 110(;q,1p /4oq a)ax kwonr rus(z W at 2000 Hz?

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122#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance must be put in series with a 450-mH inductor at 5000 Hz forg 2 ppb+yb-bs 1p(k bwo)ubnp2z*44am a to 2op 4p42kbyu n (apw-szpb*1bgm+ b)btal impedance 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 g0dsz)m s :.f80 /vvol3ocythin series with a 100-kW resistor at 1.0-MHz for a total impedance of 1:8s scglyzh0. o 3d/v)0votmf 50 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 capacito1t t+zo1ymm(k7lu i x.r. What is the impedance at 1000 Hz.7y 1xtzi kt+lum1(mo?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF capacitor at 1.0 kHz i7:po e /vrfk vaeyzej 65:vqthm94.v,u8r;g for a total impedance of 4iarf .o8:vpz;96me e/ 5y,q7j huvrkv tv:eg 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 10hun+u*etc7) q8zz mg 9-mF capacitor at 1.0 kHz for a phasezu7mqt9)g czn*+8hu e angle 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,4hk8vlm ugij/u .gk0r 9be3y series with a 30-W resistor at 1.0 kHz for a total iu j08l4. u93/gekgr biv,hmky mpedance 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 pdnb* z-. m-qqmf wel01wj c)s5hase angleb q -m-).10*eqdwcms5f zl jwn?

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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, and 1.0yk z,xby y4o).-mF capacitor are connected i)y,4kxby .oy zn series?

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130#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A series RLC circuit consists of a 100-W resistor, a 10.0-oe*pgu 0g r.t/b6cj8d mF capacitor, and a 0.35tpg/eg c6j*o b8d.r0 u0-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is the rms current in the circuit?

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131#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistance of 55 W, a capacitor of capacitive reactance 30 W iaxne8 gr8ql7evyen fx 811/+, and an inductor of inductive reactance 30 W are connected in series to a 18inygql7xe+ex/1 88a1f r n ev10-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 circuit contai1 tgjks8v,z6 :0e+noig rc, ynning a 50-W resistor, a 10-mF capacitor, and ,e1: g0zroyt6,8nvc+kisgj na 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 serfi1 lk2b,z+xrqn:, 6htr 8q ories with a 500-W resistor for a phase angle oq6 rkn:rh8t1 ,orl2 +ifz x,qbf $40^{\circ}$ 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 *b6gwpw/1 eev mgb8:2ktt1pa-ji.ro = 20.0 W, L = 200-mH, C = 10.0 mF. At what frequency should the circuit be driv1iet rmpp1wb. j*a 8b6:tog-w k2/egven 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 1i8yt2r h0s0ef.3byyr2.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V powerh b 0i yrtfys8e02y.3r 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 circu.:psd9bxgs f)p6az1 san* z.2 dudb4eit 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 i-: 9 t jwnab +:+mnz*rw7 ;bykon;fpcfs the power fac :w97fp*;fnb;ymcnb- r:wto zj nk+a+tor?

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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 containingbe p :grt*g5cs; ,3jqd a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when coneg:*d 3rspt,bqg;c 5 jnected to a 60-Hz power supply?

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139#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the resonant frequency of a 1.0-mF capacitor and a 15-mH coil in series*; -asq sbwv4b?;ss4 v w-qa*bb

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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 wi;l/yub z5j a r)d3c8fvth a 4.7-mF capacitor for a resonant frequency oaz/38rcvb5fj dy)u;l f 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.:e atkj6s6xp dsa)e ua6*lo6 f qu6o-27-mH inductor for a resonant frequency-t:6d ee*kul a6as )6jox62qo fup6sa of 1000 Hz?

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142#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What size capacitor must be placed in series with a 30-W resistor and a 47snhvbvg-)yl4zcu4 )rge: ; n 0-mH coil if the resonant frequency of the circuit is to be 1000 Heyg)unv)cb4 ln; z :g-sh7vr 4z?

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