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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 unitj b v+8quhdlnygvdt.(ln+ 90;s of magnetic flux except

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Faraday's law of induction states thatoco99) ;ohqhg.z2ow5usd ma upnu,3.4uhz 3m the emf induced in a loop of wire is proportional to

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the number of loops of wire in a coil produces what 1ph,si59wo ouesnr2-6j:wj:f:a 2k mkip3k v kind of change on thewi3soj1 ks9-: a:km25:2 uje r wo phfnkivp,6 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 m5c5 kkskym5 t-agnetic field through a loop of wire produces what kind of change on tkk5- tkyc5 5mshe induced emf, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire pgvb(ipbm 2vm6nmt6u 3-d x4cy)d6r5croduces what kind of change on the induced24pm cnbd 5gcrd ym)t(i 6vxu6v3-b6m 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 m mqiit;lq)6 :d6ja0u pagnetic 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 in a conductor wilqfe k/,r/7c4o+ mchfzh sz8 j0l be tchk87/zc fz+r ohj/m4f0 se, qhat 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 fnv,am9jfa uo u8 pj0ewa8l421lat on a horizontal table. A bar magnet is held above its center wina,jal 8m19a 024j8o wvueupfth its north pole pointing down. The stationary magnet induces (when viewed from above)

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular coil lies flat on a horizontal table. A bar magnet is held above it6wu1 j *+ddg)quww :kes center with its north pole pointing down, and released. As it approachesq1ug: w)ej du+d*kw6w 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 i9r 2j/u fu1 u3 o3z4ffkupykg-n a region where the 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 fu1y j- k24gu fo9urfk z3/u3pthe 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 tablewmv 3f,uduv5f35 pr,p ox9e.n top in a region where the magnetic field vector points straigh 3vpe.o,xnrfu3 fm,wu59d p5 vt up. The magnetic 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 horizontal table top in a rxj :jp8;puvy+h v+;vy egion where the magnetic field points straight down. The magnetic field disappears suddenly. When viewed from above, what is the direction of the induced current in this coil as the field disappearsy y8: +vp pxv;;ujjvh+?

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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 hori aj3 qz)1uz.k+wgp;lxzontal table and carries an ever-increasing current northward. Twog)+zua.w3k; lq1pz j x coils of wire lie flat on the table, one on either side of the wire. When viewed from above, the induced current circles

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bar magnet falls thrpg :nk6knv1nqg,.l,r qym fwt-(-rg- ough a loop of wire with the north pole entering first. As the north pole enters the wir k,,61-qw v(n-- qmykn.tg nr glr:fpge, 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 spvameihg0 06m,1y5i0o mbk 9 aleed about an axis whose direction can be varied. In a region where a unia ilkb0me,5v m6ao mi0hy0g91form magnetic 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 consw u5vmg /ztw+ q) 1lv,t-yu6wetant angular speed about an axis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the orqw6v-l1v/5m+,ztygwtu uw)e ientation 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.bcw2ta na- 6v +4r1.fn,ezt wo*/ owl7hvjzu)
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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 aggeiegwp+hk8b7 4.*p3 q z9lck :n)i bn 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. The j9 -akunyle.)9y,l ov emf produced in the wire depends on

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal rod (oriented in the east-west direction.4,qgvl o:bttl*nqn 0gb6(j(cfl. ah) is moved northward at constant velocity through a magnetic field that points straight down ,bhvl(bln 6t o*0:ft.aqc .j(nq 4ggl. 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 velocityaemn2l;6fh- q ω 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 transfor jdv 3 i9wx1:voon9,vlms

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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. The frequency of t l:i o,nczgb /k:j7yn2heoy72n bc,/ zg jk:i:ln 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 used h1+t)e zc(wcndu(u +pto

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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 de:i tv8 b7z/la;qm(bccvice 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 coxn vrw1.y-l 5tf7j vf8ntains more loops than the primary coilf xf- 5.vl81nvtw yr7j then 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 loops than the secc bsf:,j5 (6y+r-eo csy6gek nondary coil then it is-kege y5yrs : 6o,6c fsb+(cjn 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 poweiqo4bqk ycbis 9: 76(fr input

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a given LC resonant cicrvttgo1a z:gu262v7 ;pif2 siau5 v 8p.t0oyrcuit,

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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 seric:k .bz)qu-gnes to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across tg n:zqk -b.)cuhe resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in ser24lg x94x -. d 22jg lpiz.fgkpckgz afy9vs22ies to an ideal battery of constantg js2.d.ilzp2pak yfg9 k2g-242gxxv9 c4f lz terminal 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 inductance L and resistance R is o5gk 6ncj:x5 ksdyo2 ,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 respl9 - rsa-bt7apcxc34zv w7fu(.sv) xistance 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 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 indukkq08 tvb3t(ngtro:xy h ;/(o ctor are connected in series to a battery. The time constant for the circuit represen( r y8 n/o;t3th:xt0k koq(bvgts 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 battm qokss+ kga1+ zn8d/-ery is suddenly removed from the circuit. The time constant for of the circuit reprkoz8 q-ds/as nkmg1++esents 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-rwhl86 u1h lqc, bds* same units except:

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor is connected to an AC power supply. On this;kcdfn -u/4lm4x cm9ndvw.fqn3* g ,u 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. wht3beq4k -s/xqj9g tmii2,+ In this circuit, the current,qetkt-/9j2gmbh +wqi 43 xsi

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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 frequenr1u6h1r +t gva0pqwn8cy is triplaq6 wvgt+nrr18h0p 1ued?

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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, the3efj) :l+ kisa:u -a6xhkv3 yg inductive reactance of es ixj:g3vuf:l3h)a -6 yk +akthat 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 zerh4d)g0kr f v88lc b1eao, the inductive reactance of that coilrave k cg8fd)hb8014 l

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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. e z85t5 ygh+d2b pu2njIn this circuit, the curreh8du2 5pyjz+egtb5 2nnt

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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 a.zjp6r zes5-:1ific56 zpbmdn ac circuit changes by what factor when the frequency is triplesp1 -p bdimrejiz5c 5zz6:f .6d?

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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 capacitdli)a p9r6k u0or approaches zero, the capacitive reactance of that capac ul9)6dkr i0apitor

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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 voltcti;+qnk; n/ abo f7.dages of the inductor and capacitor in a RLC series circ;id;nc.+ nt/7fboqk auit?

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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 drxxgu7ews+7lb)p4c8 l se10 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 impedanc 55bfq an-5ueab e(60np f)dzre of the circuit increases if R increases. When is thi bfne ua(56 5rqf nbp-daz5e)0s 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 iv;thm+shny+t f ( dt+k2az asi43x 1l-mpedance of the circuit increases if XL 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.,q z4 +x0 dz5+ 79lemw qimr.lr+eh6t1pomijm The impedance of the circuit increases if XC 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 dou z/ zlp-,b+c*hjrgj1 gble in an LRC series circuit, the resc h- jjp/z+*,1lrbggzonant frequency of that circuit 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 applcphq jo kaxt5 (j1475sied 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 RLr9eh;3)sm q okC circuit occurs when

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A flux of 4.0×10−5Wb 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 -pcyzy 7, ;th;lhkoh *w+3yo ,nlj,gyfield of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field v7-,c*j n3 y ,z+;ghkywy lootp;ylhh,ector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in a uniform magnetic field of--m.mhi+luj4k8 w p;urvpqs+ 0.20 T. Find the magnetic flux throu.uwpi vq+-lh k+ 4rpm8muj; -sgh 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 magnetic field of 0vyi5+ik)x. +2gpt f yt.20 T. Find the magnetic flux throughtk fgyx. ivp25t+i+y) the loop when the plane of the loop and the magnetic field vector are at an angle of 30∘.

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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 t50d6+p dtl g/y6( qibijmp:padjustable single loop is reduced from 1.0m2 to 0.50m2 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 c;hr d6kf7 sq0ihanges from 4.0×10−5Wb to 5.0×10−5Wb 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 side3)u k+zpuxmc3s 18 cm. A unifo +pmk)c3 uuzx3rm magnetic field 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 x) 7 5mml1frtn15 turns and an area of 0.40m2 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 qnr s2pf8y8;j /d wmu8and area 0.20m2 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 w.) m:x 6rqcjmxing span of 60 m flies horizontally at a location where the downward compone: m.mr6x) cjqxnt of the Earth's magnetic field is 6.0×10−5T. 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 ao4*n *8 hsmh 1)lmydpzrxp, s/t a constant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a ch,1n ms y*lh4m) d8opxrszp*/onstant magnetic field of 5.0×10−5T. 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 qmrtusjs) c3ev4/p3 0 p5l vs5loops and a cross-sectional area of 0.25m2. 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 ,io 4zi-nbsx0 of area 0.090m2 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 rectw3qi/0na19zti e) t6vv)jvlaangular loops on its armature. Each loop is 12 cm long and 8 cm wide. The armature rotates at 1200 rpm about an axis parallel to the long side. If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, ) 06)t i9ltivqza v/vj3 anew1what 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 consistvsii cv4nf-bi ;iv+6a1d8*x hs of 100 turns of wire of area 0.090m2 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 construc0d g41sl+5 oifoszp )xt a simple AC generator with an output of 12 V maxd0xoiz5p+s 1)s4of glimum when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is 100cm2, 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 ge ltvgyod7 2nsxc)c9o+,;s 3jlnerator with a maximum emf of 8.0 V. If the generator coil has 200 turns and a cross-sectional area of 0.030m2, 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 hamglz a,y6 vw h(rdd51wv4*m( kve a resistance of 6.00 W. The motor operates on 120V 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 resist e*a(wm; 6+feg73asj1gxx7fqmb. 0l xh n: fjuance of 6.00 W. The motor operates on 120 V AC, and when running at full speeda* 7 :fb7e+xqan3mm s;0fw.6jjel(fgg xhux 1 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 suo4+vq dah9 vvdx* pwf4g- 1g*jaiw633 9jnbstpply. The oqig w9dp sh 361*vv ja-n3vda9f4x ob4jg+tw*perating 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-Vr0 4i69ad -r +:q94wezw;ipjcjar vax power supply. The operating current is 1. 4wi 0r 64zixacjep+d-vr r9w j;a9:aq0 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 rtecr5w c2zcs t4 be/8/2zi,a fesistance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A at full speed. fe42/bwt5ce tc / zci,sraz28 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 needed to reduce a prd8+1gctna)xp mci;k . imary voltage of 120V AC to 6.0V 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 transformh. p)f)w8 jvvwtyw 13eer causes 14 A to flow in the secondary. How many turns are in t.)y8vpwjhf3)1wevw the secondary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in ae l mpbv5d+ 2u hjtz5y0i.j:3r 110-V primary if the 24-V secondary5r0jp vlitbm 3yue2zj.:dh+ 5 has 100 turns?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An transformer consists of a 50 vb-4h:qxw-gw x(m)oy 0-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in4ow hw- gvxqxymb :-() 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 primarybx*fd( u4 u(6q8ymd gx of a transformer. Assuming 100% efficiency, how many amps a(mq6dfbu du 8yx*(g4xt 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 transformer provides 7500 V at 10.0 mA. Tb*7 t/xskqv*gmcj8p) x- (zx ohe primary coit 8(g7qvk pc-smoxx*)*xbj z /l 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 67 zf;.jp a3(*i4uwf1ek(iodzkw6tz5s f iqmon its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage is present in the secondary? j (d6 wio4e*pisia5tfzqf(k6zwu f7z1; .km 3

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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 anpz:e/ct:hpnolsi z+p57 . tk ;e- 1nm8rt 4xadd 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what curmppk-7;8tth:5 p 4/ai.ce:zx lns e+d1 ztnrorent is present in the secondary?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and its secondary hasahsr vr3+t evz/w pa6 :0b)axkr);si9 200 turns. If the input current at the primary is 100 A, we can expect the output curr3k+zehir0;)) svwasb t:6 xrr p9a/avent 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 th(br)o2;)8.ik z :9je(tggwabozn uburns and its secondary has 200 turns. If the input voltage ozjbb92zu t b(kr:i) )8(.gwno;eah gto 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 l .x(-wbo ocgz;y13 ey100 turns and its secondary has 200 turns. If the power input to the primary is 100 W, we can expect the power output of t3. ;-lyzcg ( oywoexb1he 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 cu(ct jzx2c v. or1fkpj8dtui 7)7fe/o 08gqa t)rrent at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200g.f 17u ) 0jpov 8jk(t8d qc)7xra/ ozcittfe2 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 120l1 u,iap g+w--xfy qt0 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total resistance 1.0 W. Find the percentage power lost in the transmission lin x0y-lg+ -i fpa1wtqu,e.

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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 curren ,5 jyj4c4bjovll85ilt at 120 V. The voltage is usually stepped up to 4500 V by a transformer and transmitted through a power line of total reyo4ic , 84bl j5ljvj5lsistance 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 hasu9rck ;f/: otk 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 ratio of 100:1. What percentage of the f/o; tru: c9kkoriginal 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 l ;n6o usqpv/j 7bd+f3kine 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 o67;nu fdbsvq+ 3/kpj 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 transmitted down a 6-W line at*tlx. m,/u ldnqlpc3 / :s6bmo 1000 V. How much less power would be lost if the power werel*ltp: sx6 l mqm/nuc,obd3 ./ 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 Visyvh 6p8c((whj de )v fh3(lyq52gz. at 20 A. It is 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 transmission is not to exceed 0.010% of the original poweryjyd6i(vw8le5g ( 2qpsvch h). (fhz3?

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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 os*a w4pk 9nd3: oxx:svf 5.0 A. How much energy is stored in the coil'po*x n:vs d:3xs4akw9 s 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 indu+zsej 4 vofv(i-fmf1 /ctor. What is this circuit's time 4e z iso(+ j-1vff/vfmconstant?

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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 vzqipjdxd4n 86 kv+ q++y u17omoltage 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 place4:a9oogc no p6d into 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 ou*lslqtv0h. 31-jef- uiy8zg mhb yz87 fwa4o8tlet. What is the resistance of the la0v-7h shg.zajlytm848 fi1w83 lq* - uefbo zymp?

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99#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10-W resistor is connected to a 120-V ac power supply. What 5oafof+-ov c8 is the peak current through the resis -vfaf o5+o8octor?

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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 tonaa:c x3jsdc:-8wxvxr m* aoh2* u u.4 a 120-V ac power supply. What is the power dissipated in the8:oj.mnh 4a*a:a d*ucv xc xr3-uw2xs 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 wb.tko9 e5d6 ra 50-W resistor is I=0.80sin⁡(240t). 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 sm;:m keed)+f9qw/ us50-W resistor is I=0.80sin⁡(240t). 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 is r s,,x r9p*y(9wmxnbhI=0.80sin⁡(240t). 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-)rzynaqo : hu/*tm2v inductor at 60 Hz?

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105#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the inductive reactance of a 2.50-mH coil a zem 8ld, dnpgklq-07)t 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 reactancekr2dcs 19,rab ho,/n i?

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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 reactancdj gbz-xij2od9 9.. )dbx*h10gxu zrqe at 1000 Hz?

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108#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows in a 60-mH inductor when 120 V AC at a frequency of 20 kHz 4: qmkt0vkd; fis applied 0t4;dfkm vk q: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 1lggjpc28 8m- +pap 2ox10-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 capacitivxq .kw*yhn4k56agq ;0stej*te reactance 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 reactancb.at8 w,bje7f7s gyt (e 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 120g- x*en4y l0yde;*nnk0 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 j19mn3voq2 s1nkwad1 capacitive reactance of a 0.010-mF capacitor be 100 Womn kdn1j2q1v3s 19w a?

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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 1003g6rfrgvn x3 -7grli( 0 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 h9 kfm1kq/q(-v4h 5mjfe7wh n 12.0 W resistance, 15.0 W inductive reactance, and 1hh/mq hj51v 97e-k 4(ffqkmwn 0.0 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 impe5 fzkp7 5e cjj7mf5;vkdance at 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are co55 5mkj;p ke7fcvz jf7nnected 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 Hx1g fk0sr nj7*j6e.lkz if a 100-W resistor, 20-mH coil, and 1.0-mF ckx nk7j6res1.ljg*0f apacitor 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 ismv8+ ii6v mi4 hki5vuw3)sns ; connected in series with a 20-mH inductor, what is the impedance at 1i+ 8iw354 6mvu) s;nhivmksvi000 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 20-mH induck w8hf8mge pt7r+ )-uzhp2f/ ntor, what is the phase angmrtnp 8z 7-2 +hhwef/g8)kfuple 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-zacwva a 7y3n ninm-6t2l):z9mF capacitor for a totw92an-:c7azzl6 m i3 yvnnat)al 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 series with a 10bq51h5,wz2i tsmo ) uewo,o0z 0-W resistor and 15-mH coil to get a total impedance of 110 Wuth02), seo,qz5b5mow iw1 oz 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 H k835xuo+/nl;k dd rbpz for a total imp5lu +db8 xkp3/;rdnko edance 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 wit-z:3ua zser.v h a 100-kW resistor at 1.0-MHz for a total impedance of 150 kW?3ues:z - vr.za

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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 withs1hks2lv 3uj)i:0kh f a 20-mF capacitor. What is the impedance avk kfuh:h1s0)j i3s2lt 1000 Hz?

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125#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 1n:m6 oy cx8ra+yam8 1s*q u8ov0-mF capacitor at 1.0 kHz for a total impeda8or c6 naum1 osxm*8vyy:8a+q nce 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 w18go4c peb w3jd s;-qi) wj1mmith a 10-mF capacitor at 1.0 kHz for a phase angle c i pswg3bom8m4 1q;e-j1dw)jof 40∘?

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127#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What capacitance is needed in series with a 30-W resistor at 1.0 kHz for a totad ;zwsm s4/2irdzra c9:5gkg:-pq,brl impedancergk qw /am:s p,cgzbddri5rz49:;2 s- 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 szo2.g 6ppy:vuv)u b e(eries with a 100-mF capacitor at 120 Hz. What is the phaseb6:euz pg2.o )vp(vyu angle?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows at 5.0 V and 1500 Hz if aj4zp3 l ;uod4dae- t;tgms *(i 100-W resistor, 20-mH coil, and 1.0-mF capacitor are coot4d (-4*zm ide 3 sp;;tgljaunnected 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 resistor1rrrb5:wwnn 0jp g2m6 x-nvy) , a 10.0-mF capacitor, and a 0.350-H inductor. Th1ryxpn5 n rwb:rw gnj-vm) 602e 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 offuy5ref ;(t,(xdlx 0q capacitive reactance 30 W, and an inductor of r( ,lu( q5;xed0tyf xfinductive reactance 30 W are connected in series to a 110-V, 60-Hz power source. What current flows in this circuit?

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132#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the phase angle for a s-ub82g kaz cx,ryg, f/3jq)vjeries RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-g2ba xjcy-rkqvzf,g )u ,/38jHz power supply?

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133#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary in series with a 500-W resistor for a phase ang w-c8jp3skp ,ole of pjs-3o8, cpkw 40∘ 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, az7b)666-bgea5dfrivk xy 3hmxm(q dev,. j:C = 10.0 mF. At what frequency should the circuit be,d5)hvxz.d ygq m6b6:ja- rix(6ev f7a kebm3 driven in order to have maximum power transferred from the driving source?

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135#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the power output in a0tp pot qu-7d)n ac series circuit with 12.0 W resistance, 15.0 W inductive reactance, 0ot-duq t )7ppand 10.0 W capacitive reactance, when the circuit is connected to a 120-V power supply?

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136#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The phase angle of an AC cir(sj aj0 ) 9il.-dleejdcuit is 63∘. 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 ysqr a 6oha17y-x n(l)W and a resistance of 30 W. What is tlyrn-hya 67oxq s)a( 1he 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 containing a 50-W resistor,4rh)yu (q)uqub7 ck1 +;e5 rpnyamp3y a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-Hz powerrpu)yqqbr)m;7 p+ y u(uk3 necy154ha 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-mr huzyft,4as2 )b g-:hH coil in series? ,fbar- g:su24 )ythzh

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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-sd w5(ax.z *jnmF capacitor for a resonant frequency of 10 * zxw a.dn5(jskHz?

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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 /ga+78p n kzibfor a resonant frequency of /8bapki+zn 7g1000 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+, ml* ytf8izx-W resistor and a 40-mH coil if the resonant frequency of the circuit is to be 108+yzlftm* xi, 00 Hz?

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