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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 magneti,1yozz y( ay;pb gei-r8sw .g3c 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 thfxz(f;d gk q4 ruw(,j+at 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 wir;xc*b sna ih(lo9z5zxo7 ;agy79j:jhe in a coil produces what kind of change on the s;*a( hx9: oij n 59ay7hzcx7z;oljg binduced $emf$, 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 thr 2 tc,l3diul9nough a loop of wire produces what kind of change on the induc,ni 2tucd3l l9ed $emf$, assuming all other factors remain constant?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Doubling the diameter of a loop of wire produces what kind of ,nf pz b 3-x.7(p+ywfu seok5er6x8mxchange on the inducezps p ffu6+xy8- .,roxn57x3wbeme( kd $emf$, 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 oeutj36. o)kemagnetic 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 indq:1 wped: mcaey3;l*un l6qg4uced current in a conductor will be that which tends to produce which of the followga lc;:lne e*6u1yq:w43dpq ming 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 tabc,9gl+3ab n g7fy*tgi le. A bar magnet is held above its center with its north pole pointing down. The stationarylg+n3i,ytg9fg 7 b*ac 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 bar8t (pi/x x6l zef;v 8fr6cllw8 magnet is held above its center with its nor8e ;fcxlrpitwlvz 6 86(f lx/8th pole pointing down, and released. As it approaches the coil, the falling magnet induces (when viewed from above)

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil lies flat on a table top in a region where the magpv3j5qhx 2 i6jc,pme -netic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced c , jiepphmx65vc3j -2qurrent 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 atxpl7f+x/b gpvy w/g/,u+x)n 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 in this coil as the field wvx g/ upptby )g7x l/+,xf/+nincreases?

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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 tabliw kym(ui) q -,iltbf1f8)cv1e top in a region where the magnetic field points straight down. The magnetic field disappears sud1f( cluy1i i)vb twf- )mk8qi,denly. When viewed from above, what is the direction of the induced current in this coil as the field disappears?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A long straight wire lies on a horizontal table and carries an ever3sd829 ykjgn r-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 currenn92k 8gs3jyd rt 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 pole enl+; vi7rgmh3vq ddka 92o 71kbtering first. As the north pole enters the wire, the induced current wil9 l v1rag;midb dk72h73kqv+o l 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 z)*p,.szxf- +/mhzf blj,ma baxis whose direction can be varied. In a region where a uniform magnetic field points straight down, what must be the ora zmh bb/.*zx-zf+)p,lj ,mf sientation 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 abox2rn gw 17yaw uh8y:7iut an axis whose direction can be varied. In a region where a uniform magnetic field points strai 7ayighy xw2w1 :u8n7rght 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.7z*vhboh4b q y f+3v3k
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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 an 3.e b63 qwy ydwtijfi.2hcg*nb5 r*z2 $emf$ 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/uwxmfrcg2m8)*pbi:tq tgf (-al+; 7ijd ph; magnetic 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-0g eegr) dhww;-b,c,o west direction) is moved northward at constant velocity through a magnetic field that points straight down. Make a statement concerning the potent0ce)e, rg ,;wgdobw- hial 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 :a 33rxsd/vna(d u+y zangular 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 generatorb-aqk hn.n mq8k 8o29u transforms

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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 sec nk(vlju i8g81ond. The frequency of the nul8 g v1j8ki($emf$ 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 usedgbx/0id u5t(;pra :te to

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A transformer is a device td 81jr8.g(ecwgypp xfenf 7gh4..5gl hat

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, if the secondary coil contains more loops than the primary 2wfmbi ye-e8k b667vkcoil then68-b7mb6fyeie 2vwkk 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 secondary cokj5 w7(refyl 6il t(wlfjery 5k67hen 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 powe+)pl ghp5uth 2r 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 resonasjwi qwvi:*hp7 w27 0gnt circuit,

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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 series to an idhr-5y v,cmq+ deal battery of constant terminal voltage. At the moment contact is made vcmh5dr -+y ,qwith the battery, the voltage across the resistor is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A resistor and an inductor are connected in series to an ideal battery of consjj,ti vtgt+rnm +;+r1kj +m fx9:xmy4tant terminal voltage. At the moment contact is made with the battery, the voltage across jxr, : kt1;m tjigtr+m+m+4xv9 +jnfythe 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 connected to an wv *t7dn* )rvz4 5kofc$emf$. 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-b h r a7:+p1,hz ebegp6t8ogr1psgo( 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 in series to a battery. The time edu,c;z3xxq 4 +sed/mqa/gb, constant for the circuit represents x/a ;qcsb+eg4/ due,3x,mzd qthe 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 serf4 hg94u pa)deies to a battery. The battery is suddenly removed from te4 )9huap4df ghe circuit. The time constant for of the circuit represents the time required for the current to decrease to

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  All of the following have the same units exc)3lu9wf i u.;mwl3ecp p( j/tdept:

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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.*56reum f(b0euio6-daz- yk o9ufx2 t On 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 AC power supply. In this circuit, thezi g :c pu6,0l4wqpia5 current ,g 5ipc lz:06qauw4ip

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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 ana h-u c6lmz7g85o cba6 ac circuit changes by what factor when the frequency is87g -albcc6 zm5hua o6 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 A ;9 v h k3x;5vvd)*a4htb6gvfj ezbzq+C voltage across an inductor is doubled, the inductive reactanvkf9v zq;zhhja+v;dt ev*b5 6 x)4 g3bce of that inductor

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage a)h*xpd8ktghs) 2b a. pcross an inductor approaches zero, the inductive reactance h2.spkdt p8ah)gbx )* of that coil

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pure capacitor is connected to an AC power supply. In this circuit, the c(ejhb7y2( vhe urrent( v2by(h jehe7

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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 bh0z8, bo;wtbcircuit changes by what factor when the frequenbobh8,b ;t0w zcy is tripled?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the frequency of the AC voltage across a capacitor approaches zero, the 6 buf11*dcnqnol g;6+z rf9of capacitive reactance of that capobzr;fu *6fn6+lc9d1 onfqg1acitor

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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 t fgx9u( a,nd3orr9 yuq;sxf71he voltages of the inductor and capacitor in a RLC sraf,1(nuxu gx7ofsd 9r; y3 q9eries circuit?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The power factor of an RLC cir01i ur*+ecvp bcuit is defined as $\cos M = R/Z$, but the phase angle can also be calculated from .

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an RLC circuit. The impedance of the circuit increa hx,qvs;m9ms:ses if R increases. When m:,hv 9x;smsq is 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 impedance of ticif 7lff8 ,wh 9,/yhphe 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 circuit. The impedance of the circuit i oynga;wf)k4 a0 j1ow6p:1fxn ncreases 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 capacmlukwmpz*y b tu7c-a4 g(noz92i-7u/itance both double in an LRC series circuit, the resonant frequency of*yzguptim n-c7(km-w /o ul7 42 b9zau 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 applied voltage. At resonance,8 j uevzd:cza+crg51)

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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 occk 5o*k ,;qsb ag+6nxo:zp dtu)urs 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 magnetdzcsyg5(ld :z4x7ijv.7 l *mbic field of 0.20 T. Find the magnetic flux tli: .c(bjgdz7mzxd v4 ls5y*7hrough the loop when the plane of the loop and the magnetic field vector are parallel.

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A circular loop of radius 0.10 m is rotating in9iycy db/uc/( 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 v9/ubd yc/y(ciector 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 fielp:ej ,d f6j1f zv9kn;io1uz5hd of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are at an angle of zpjedj ,5 9i;f1 :6fkuohnvz1 $30^{\circ}$.

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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 ad217em 5z5uy w0evbj ikjustable 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 changes fromdal p;1u* wx.npi(+o a $4.0 \times 10^{-5} \; Wb$ 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 squareljb 7j:b kox-9 frame with sides 18 cm. A uniform magnetic field is applied perpendicula-bb:jlj 7k9x or 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 15s/v qc2u 0tfc(e4 69vh4 7pdfszf. nyw turns and an area of $0.40 \; m^{2}$ is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s. What is the magnitude of the average induced $emf$?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A coil of 160 turns and are,y ,m vc jj1,q*hdv1iy:yg,v s:3u jkta $0.20 \; m^{2}$ 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 hol. imsrh 7g(*prizontally at a location where the downward lpr s(m*gi7. hcomponent of the Earth's magnetic field is $6.0 \times 10^{-5} \; T$. Find the magnitude of the induced $emf$ between the tips of the wings when the speed of the plane is 225 m/s.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horizontal metal bar that is 2.0 m long rotates at a cont)4b2/j tiyr lstant angular velocity of 2.0 rad/s about a vertical axis through one of its ends while in a constant magnetic fiely /b 2tlrtij)4d 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 loodg6(o 8 b6vqwydz+e z9ps 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 a) h 4nipmeufk(;vli1 smpa-j h7-5 ;sof 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 armature. Each loop yx-lkr )s p 3/*7bufabis 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, whatu)k7s*ybf3p x-arb l/ 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 10:ds-7e5p(z4 xae7 t spvd)pqlt 73h 2cizu:eq0 turns of wire of area $0.090 \; m^{2}$ and total resistance 12 W. The loops rotate in a magnetic field of 0.50 T at a constant angular speed of 60 revolutions per second. Find the maximum induced current.

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that you wish to construct a simpjdwx)mwer8 lrw w 9a95ne8:*dle AC generator with an output of 12 V maximum when rotated at 60 Hm)d wnaw8d 8xw5jl :erw9 *9erz. 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 with a maxx sz mxp.vs.ln (9; t7(otgmv6 e0x4hbimum $emf$ 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 resistadv- nhixy;7jues4 ;7sru z)n+nce of 6.00 W. The motor operates on $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The windings of a DC motor iu9pxihk +2y-have a resistance of 6.00 W. The motor operates on 120 V AC, and when running at full speed it geu-2 hy+ ii9pxknerates 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 resio 35cr*wes4vm stance 6.0 W is connected to a 24-V power supply. The operating current is 1.0 A. What is the start-up current?54s3e wo c*rvm

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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 awq:lk j+b;p 5 s)fyjh6 24-V power supply. The operating current is 1.0 A at full speed. What k 6j+h:wpbjs;yfl q5)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 supply.slp..k-: ;avt p/ jezw The operating current i.vlzas ppe.-kt:j/; ws 1.0 A at full speed. 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 neede(f+pl2,3,evydg b kapd 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 t e( iz p6.b;gzp-ixhqlatk;,; he secondary. How many turns are in the secon z.pl-bei;pq zi,;6ax k(g; thdary?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a transformer, how many turns are necessary in a 110-V primary ifha0n uztn9p wbn1a5ilz 40a )8 the 24-V sechnt089 )inl10azun paa5wzb 4ondary 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 500-turn primary coil and a 2000-turn seconz(wr(hq(0 iq3(wm gl qywi9.qdary coil. If the current in the secondary isq(iw(9gqy0 (mw q. rh3lw(ziq 3.0 A, what is the current in the primary?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efficiencyoq*+fmn 0z(*gstzipu n;n b*4, how many amps z** t*fmn4pg z+osunin;b 0( qat 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 u : ;rn.wu4itgtransformer provides 7500 V at 10.0 mA. The primary co.ngui4trw: u ;il 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 turnrkzfxx4q.h+ikzu .f,pc8( z: s on 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 presen r kfu 8k,+zzxq.(pci.fhz: x4t 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 coi2 o -w/pw5zvcu;5zno el and 300 turns on its secondary coil. If 120 V at 2.0 A is appl / 5wwnz-oce2vupzo;5ied 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 transformer has 100 turns and its secondaryt hnk8 q*om/;l4/3sz-jv4 p txz coqg5 has 200 turns. If the input cur-n83xzkqo p mq;4s5jz c/ g4vtlo/t* hrent at the primary is 100 A, we can expect the output current at the secondary to be

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The primary of a transformer has 100 turns and it,jmik id t,z7sy k:8 .d:dj4tgs secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to bezygkdt:,t8m j7: 4. ddjsi,ki

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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 transdygy(/ 9 3lh; rq j;r8yp/jkgvformer has 100 turns and its secondary has 200 turns. If the power input to tl;yprh;// ky3jvg9 g( ry8jdqhe primary is 100 W, we can 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 3l1zbn8 * bnofvpph d (s/+toj)u4gc.current at 120 V. The voltage is usually stepped up to 4500 V jc8+ b4.zf/1)d*ol s g(nhtbp3pvnuoby a transformer and transmitted through a power line of total resistance 1.0 W. Find the number of turns in the secondary if the primary has 200 turns.

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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A generator produces 60 A of current at 120 V. The voltage is usually steq39:jcc4ad qbpped 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 a4 jb3q:c cq9dthe 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 cuc;0. uiqtil+-po4, wcse( qjapmu +(frrent 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. .-+;qj , c0pfe(wu+oq4 stmail ic u(pFind 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. f6ii n 5/0dz -/lgknwlA 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 an6zkg5fwl ld/n /i0 -i 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 li eyv4d* h0cu,ane 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 ratio of 100:1. What percentage of the original e vade h0y,*u4cnergy 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 *ez06rv p2ixc-W line at 1000 V. How much less power would be lost if the power were tran6erzi pcv *0x2smitted 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 ; tq t 8nl0ha vljfaf79s8b;a9z)wyb9is to be transmitted on a line with resistance of 0.60 W. Tv);; 9lb78an0 astw9zt yhafb8lqf9jo 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 power?

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94#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 4.0-mH coil carries a current of 5.0 A. How much energy is 25kzxi1nc5 u/*z rjpsstored in the coil's magnetic c2zpzn155ix* rksuj/ 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 i5lxnvqd.rnycg0- oy.-z)x,n 7s z f/)/yun iqs this circuit's t)qg.n) /, n uzcyqy0 xxd-fno-ny7s5z/vi .rlime 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 where o6qlk g9,:m yithe 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 into a 120-V AC outlet. What iszdxhj5at070wzng7xf:m0 jw v 0 :krb : 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 resistance of the : p/u,2 etpw3ii kxk-ilampip,xewiu-/ k 2 p:itk3?

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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 cj h1b,-z1 w4lg+i/ovvpw pi x/onnected to a 120-V ac power supply. What is the peak current through the rp bh,zx+iw1 v 4 p/1-gjlv/iwoesistor?

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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 nyg3; dgmf(m)p( i(ns120-V ac power supply. What is the power dissipated in t;(i s) fp n(dgnygm(3mhe 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-Wh,euh :6kfxcaxi mj1 -;ra 5-d resistor is $I = 0.80 \sin (240 t)$. What is the rms current?

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102#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 5aj*m nfx:a(mg )h ;s4a0-W resistor is $I = 0.80 \sin (240 t)$. At what frequency does the current vary?

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103#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The current through a 50wjckfu9a+go6o)oi- /mk v-i 5-W 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 agt5 9u;gefgzw3vr(v9 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 reactz6 :h-i2sjkzuance 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 o ;igfd*n2gyf ob4l5ttlxp,8*q + nz )ff inductive reactance?

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107#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What inductance is necessary for 157 W of inductive reactance at +;hcs. cefw3r1000 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 frequt1t0,-cql c goency of 20 kHz is applied to it0t1 l t-o,qcgc?

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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 tow0e7f-z :jln 7qo lcv/ kqd(;ni3 -hkj 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 1ods9 j3pixyv.k- kzl5z(*p7 ;5eb j lgar.nk 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 neb49vyx. xh9z woa;f knvbc, ltk 2f669eded to have 50 W of 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-mFsj6, yf1 zejsd0ib p6g,np.(f capacitor have a reactance of 1200 W?

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113#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what frequency will the capacitive reactance of a 0.010-mF ca-b. vcmwo) a4dpacitor be 100 W?ow4vc) a.-bmd

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114#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the current through a 0.0010-mF capacitor at 1000 Hz and 5.0 V? jms n*+lb/8wznlz+9z 1 ivfmtbke2( 0

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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, 1fw0 i2j ,xvsf15.0 W inductive jwxif s0fv12 ,reactance, and 10.0 W capacitive reactance?

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116#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the total impedance at 1y-3k aizc c2y/500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connect/ckyz-2iy3c aed 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 15004; f (a*iaegy.zuw5oc Hz if a 100-W resistor, 20-mH coil, and 1.0-mF capacitor are connectegcway;*a(i4 5fez u.o d 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 20pwcx- b9vg h553 mb+cs-mH inductor, what is the impedance xs 3hvp5b mg-bc9c+w5at 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 av ;6cl:gj t -h;vc3ez-evl0gp 20-mH inductor, what is the phase angle at 1000 Hz?lh6:gvej 0l;3pt ec -gzc;vv-

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120#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is neededjq,;nt :466dromcbak in a series circuit with a 20-mH coil and 1.0-mF capacitor for a total impedance of 100 W ajr; c4t qdok6b6 n:am,t 1500 Hz?

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121#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following capacitances is needed in series with a 100-W resistod gju)xl+w 3yw2khv,p7n q0g8:hhqp ;r and 15-mH c yh dnv0;,p3 72 hkp wqhl+:8ugqwgx)joil 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 series with a 454 9 xd/u j5p 1ikwca;jb pf6a,ks14ubq0-mH inductor at 5000 Hz for a total impedance ji p4;d1f/a65ua, cj k4u xsb9p1wqkb 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 100pp+pri06tqkcanj r93zem*)- s8a 5wc-kW resistor at 1.0-MHz for a total impedance of 150 kWja8)z35nt9rpp cqcrik6+me p0- a *s w?

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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 ca6wge ox;;g;et pacitor. What is the impedance at 1000 Hzxgegto;6; w ;e?

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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 1.0y 2l vlxq6x t/0.3ujcr lxm-5ar5yc(g kHz for a total imped -.gtumcx06( r5 23rc y/yqlv xaj5lxlance of 45 W?

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126#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What resistance is needed in series with a 10-mF c pfbqo4dyn p+k,g(+5capacitor at 1.0 kHz for a phase + ,pqknyoc45f(+bp dg 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 series with a 3) c 46i o3dcsuq9rgf0d0-W resistor at 1.0 kHz for a total impeda o 6gicd)q9 ucf0sr4d3nce 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 se0h5dxm0ycaa r bbo)e418rw) dries with a 100-mF capacitor at 120 Hz. What is the phase angle5 1d b) emhdorwxy8)bacr0a04?

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129#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What current flows ajoi+,8 0apxs b lj+b5bw l( t0j+fy/iot 5.0 V and 1500 Hz if a 100-W resistor, 20-mH coil, and 1.0-mo sfw lt i+bi y0j+al5/+job,( b8xj0pF 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 resistor, a 10.0-mF capacitor, anda m3i5x,9if cw a 0.350-H inductor. The circuit is connected to a 120-V, 60-Hz power supply. What is twi9fcixa35 m,he 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 capacitc 5lr1z2l5rrb ive reactance 30 W, and an inductor of inlr2b rrzl1c 55ductive 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 series RLC circuit containing a 50-atwpx .ciei87(b /w5kW resistor, a 10-mF capacitor, and a 0.45-H inductor, when connected to a 60-5/7ti wwbx p(c ak8.eiHz 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 50tf d6w0i+ffnjet 0 ):v0-W resistor for a phase angle of )dw ftf int ve+60jf:0$40^{\circ}$ 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. A4/q(e nv8 6wyai rd pmv,3+ir eode)h6t what frequency d +hyqe)6 eioi3rwedpvn(a8,4m /vr6 should the circuit be 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 an ac series circuit with +68ks 3w9(vyvc-q41z ;w+evite f7dilsxv am12.0 W resistance, 15.0 W inductive reactance, and 10.0 W capacitive reactance, when the circuit is connected to a 120-V po3w q wfvv(7i4sxtsy198+vza;-ecv+ 6de iklm wer 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 circuitx ,m.cj/dd 7k *7ewrpo 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 Wnj)2 4j:(jx co:3ht u .q)hdz(dneqx b and a resistance of 30 W. What is the power factor?xj)j4 jdd3xqe :)( ncu .q:h(o2h nbzt

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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 facto k:jb 4l49kso6zkw3j xr for a series RLC circuit containing a 50-W resistor, a 10-mF capacitor, and a 0.45-H inductor, wokl z:j46sjb49 3w kkxhen connected 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 ca poj03mmj1u4uq1 ,hn79w sem spacitor and a 15-mH coil in series? ,u4 1jq130snuejw9opm mhm 7s

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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 seri1h mjv2s8bc83, cge/gtuj kd 2es with a 4.7-mF capacitor for a resonant frequency of 10 mh,v2 c3cbdg1tj 8/2j gse8uk 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,uq0 m5w gdv6y.:1zx-x kvcnn a resonant frequency o:6v d,1 nz.vuw gcx m5-0yknxqf 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 beud mosa*xn:53 placed in series with a 30-W resistor and a 40-mH coil if m*dxnuo:3 5asthe resonant frequency of the circuit is to be 1000 Hz?

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