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习题练习:Fields D.2 Electromagnetic Fields & Potential



 作者: admin   总分: 37分  得分: _____________

答题人: 匿名未登录  开始时间: 24年01月22日 20:56  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  
  The work done on a beta-minus particle when moving it frp9omj+kg 4rhkf f b0:.om Y to X is found to be −10eV. Equipotential lines are represented by the dashed lineb.p m409fgkjko:f hr +s in the diagram.
What is the work done by the field on an electron when it is moved from Z to W in the field shown?


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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A point charge is movehnqz * i rwc9nl*0evpw8hy 682d between two parallel plates separated by a distance of 5cm. The potential difference between the po cl *pn*nrv w2 8zh0ewi69yh8qints is 50V.
What is the average electric field E?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following correctly lists the fundamental forces in (keqbio;clboyy9) c- 2k:ch2decreasing order :e2chi;ck - )ckblqyob ( yo29of strength?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A beam of electrons enters a uniform electric fieldbdwbq:e :atm*t6-caq jj0b 5), as shown.



What effect does this field have on the horizontal and vertical components of the electrons' velocity?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A hydrogen nucleus is held stationary in a uniform vertical electr ka,/)4hp xni d;uj)g 0tg9-rxwbmvu6ic field, represented by the arrows. Which of the paths shown kamgxhd u b;9jx)/,r 6 -)u wiv4ptn0gwould require the largest work to be done on the hydrogen nucleus?



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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two charges, separated by a large distrinuq i5(qxqci14e ui0g..9f ance, are shown below, along with the electric field lines around each chaui4i(q5e0q r g9.nqiuif1. cx rge.

Which of the following statements is correct?
I. The charge q is positive.
II. The charge q is equal in magnitude to +Q.
III. The electric field magnitude near the charge q is greater than the magnitude of the field near the charge +Q.

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A positive and a negative 9vtp;mma9b 3t charge of equal magnitude are located on the same horizontal line.mvb;tta3p9m9

What is the direction of the net electric field at the point marked X, equidistant from the two charges?

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A plastic rod carryinb1r:pabl5 c-mn7*v gn5uyez * g a uniformly distributed positive charge is bent into a quarter-circle. What is the direction of the electric fielda1 5uml*:-g nr5py 7*nbzvbc e at point P?


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9#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A non-conducting spha/eensni6y/bp 2m 6 2nx7me0m ere with radius R carries a uniformly distributed positive c/ien es07manx 6/2y62mbmp ne harge with charge per unit volume ρ.Point P is at a distance r from the center of the sphere.


The electric field outside this sphere is given by $E_{out}$ = $\frac{ρR^3}{​3ϵ_0​r^2}$
While the electric field inside the sphere is given by $E_{in}$ = $\frac{ρr}{​3ϵ_0​}$
Where $ϵ_0$​ is the free space permittivity.
The radius of the sphere is 2.0 cm.
1.Calculate ρ when the charge on the sphere is 0.1 μC. ρ =    $\times10^−3\,Cm^{−3}$
2.Determine the electric field at point P, when =r=3cm. E =    $\times10^5\,NC^{−1}$
3.In the space provided, sketch the variation of electric field E with the distance from the center of the sphere r.


A positive charge is released from the surface of the sphere.
4.Describe the motion of this released charge.

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The diagram shows the equipotential lines ib+kaf q jg+ i2)g-nj5ms+ l0aqn a field due to A and B. What may be represented by A agjaq+-+sq2 l)0bk5gni+a fjm nd B?

I. 2 equal masses.
II. 2 equal charges of the same sign.
III. 2 equal charges of opposite sign

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electron enters an electd.au; x w 4j(iq0f4edfric field represented by the equipotential lines shown by the lines in the diagram. The electron’s path is shown by the dotted line e f40iwx (fdaqj4;u.d.

What is the path of an alpha particle entering the same field with the same velocity as the electron?


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12#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An atom is being modeled with an electron assumed to be orbiting the nucleus in knx3vi vvw 1)a av/ apy,j-x;-the f-jwv/x-pv3ixvy a;va1 ) a ,knirst energy level with a speed of  $2.18\times10^6ms^{-1}$
The orbital radius of the ground state, in m, is given by
$r=(0.53\times10^{−10})n^2$
Where
$n$ = order of the energy level.
1.Determine the charge of the nucleus. q =    $\times10^{−19}$C
2.(1)The electron moves to the second energy level where it orbits with a kinetic energy of $5.44\times10^{−19}\,J$.
(2)Explain whether the centripetal acceleration increases, decreases or stays the same.
Calculate the orbital period of the electron in the second energy level. T =    $10^{−15}\,s$

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13#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Two positive charges 2Q and Q are lo37jvl x;gn .jquj n0ri4cleoc3 +95jpcated as shown in the diagram. Some of the electric jg0 iucj.vpr9lc+oj354ej3 n ;7 l qxnfield lines due to the charges are shown on the diagram. Points P and S are two points as located on the diagram.



1.Define the term electric potential.
2.Sketch the equipotential line that passes through point P.
3.A positive charge is moved from point P to point S. State and explain how the electric potential energy changes due to this move.
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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following pairs of graphs represents how the electric field qbksgko v*d*b )2w0 5hand the electric potential due to a hollow conducting sphere vary with distance from the center? The origin of the graph represents the center of the spherb* q)k*dsv 05kgbh w2oe.




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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following is equivalent to the unit of electric potentialex0k0hol mg9o -8g+jp differenc8 p+9hk oxg-elm0 0goje?

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16#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two point charges of 5 l/ k1wf(+mpskxgy 4x−4.0μC and 88.0μC are separated by a distance r=2.0cm as sh l gx5x/k(kpsy1wf +m4own in the diagram

1.State what is meant by electric field strength.
2.Calculate the magnitude of the electrostatic force exerted on each charge. F =    N
3.Three points A, B and C are at the regions shown in the diagram.

(1)Deduce which point(s) could have zero electric field. Explain your reasoning.
(2)Calculate the distance(s) from charge q1​ to the point(s) of zero electric field. X =    cm
(3)The two charges are inserted in a water tank separated by the same distance as in air.The permittivity of water is 80 times that of free space.

Discuss what change, if any, will occur in the location of the point(s) of zero electric field in this case. Justify your answer.
4.The charges are removed from the water tank, and $q_1​$ is replaced by another charge that is identical to $q_2$​.
Point P is at equidistance d from both charges as shown.

Draw an arrow indicating the direction of the electric field at point P.

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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
1.Define electric potential enerb i*ssqxu;quj2 (dqh (zn5 p71gy.
2.Two parallel plates are at potentials −2V and +12V as shown in the diagram.

On the diagram, sketch
(1)The pattern of electric field lines between the two plates
(2)The equipotential line which represents zero volts.
3.Calculate the work done by the electric field on a charge of −6.0μC when it is moved from plate B to plate A.
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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A positive charge Q and four pointkf d1ry: .oj6ay,yo7w) j)zdm s on equipotential lines are represented in the diagram shoj .jk:,rdm7yw)1dz yao) oyf6wn.
A negative ion is moved from location 1 to 2, then to 3 and finally to 4. Which of the following gives the correct nature of the net work done on the ion during each section of this movement?


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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The diagram shows the ed1r l ye(p1cvgp:g- 6edr6h0jquipotential surfaces of two charges.

Which of the following can be the directions of the electric field at points A and B?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A charge of X and a charge of 20nC are held at aqivyb*;jcy.2 ,j l2tt fixed distance.

A point where the electric field is zero can only be found in region 1. Which of the following statements is true about the charge on X

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two charges separated by a distance r are placvx2lh:)rcc 5qi 5 v4v ecs(le9ed in a medium with permittivity ϵ. The charges are then moved to air so that they have the same force bc v54 vevq )2l9cilh5sc:xre(etween them as that in the medium.
What is the distance between the charges in air, knowing that $ϵ$=$ϵ_r$​$ϵ_0$​?

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An electron is released from the negative plate of two oppositely charged x) l-bkl o7;3:xqo hklparallel plates placed a fixed distance apart. The potential difference between the qk o3 x7l-h;lk:xo )bltwo plates is V, and the electron reaches the positive plate with a speed v.
What would be the final speed of the electron if the distance between the plates remained the same, but the potential difference between them were doubled?

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A proton and another object with charge +e exert electrim g-hb0t 5 5pdni;k+lrcal and gravitational forces on one another. To the nearest order of magnitude, what mass must the object havn5 0+-ig 5l mktbhdp;re to be so that the net force acting on it is zero?


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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Equipotential lines representing the corq;v +fp/1noisdm, kx5rc6hw/responding potentials are shown in the diagram /i1, wrh;cno/dfk qsx+6p 5vm, in an electric field.
Which of the following is a correct statement regarding this electric field?




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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two positive charges;s cx0sw zdynk:)fg 2* $q_1$​ and $q_2$​ are separated by a distance d. A third positive charge q is placed at a distance $\frac{d}{4}$ from $q_1$​ so that the charge q is in equilibrium.


What is the ratio $\frac{q_1}{q_2}$

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Four fixed charged point particles are at the vertices of a rectangle. Which arrsvvdifj .ld 12d+o.t +ow rvo2dfi1d + t..s vdjl+epresents the net electric field at the center of the rectangle?


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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Four identical negatively charged obg+cl pm, 8x(2njq-avrs:up g7jects move in an electric field along paths shown as arrows below. Equipotential lines for the field are s:p (g+js vm2cnqr8gx lp,7-ua hown. Initially, all four objects have the same kinetic energy.

What is the relationship between the kinetic energies of the objects at the end of their paths?

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two parallel plates are separated by a distance d and c mut9;y k4dpy-onnected to a battery of pote- p kmd;tuy4y9ntial difference V as shown in the diagram. A proton released from the positive plate gains a speed v when it reaches the opposite plate.
The separation of the plates is decreased to $\frac{d}{2}$​.
What would be the speed gained by an alpha particle released from the positive plate, when it reaches the opposite plate?



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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two positive charges of magnitude 2C and 8C respectivel,.nlgw-b kxxf n67*j oy are placed 9cm apart. A tg* fnxoj7 xl kw,-bn.6hird charge is introduced between the two charges as shown below;


At what separation, X, from the 2C charge is the electric field strength equal to zero?

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The diagram shows equigc6( udeqz( wg*2-z7o0ew b bkpotential lines due to a point charge.
A second point charge of 0.8μC is moved from X to Y.
What is the work done on this charge?



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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In the following diagram, the size of the charges is small compared to thw 8:u6m (h:dvrad85w l5bxnvje distance R. (l:a 55ubd j8mwhwvrx6:8d v n



What is the direction of the force on the charge in the center?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Estimate the speed of an alpha particle that has accelerated fromc0vxq4cfq7l 5 (k* hqt rest in a uniform electr4*q (qvtk0ccq57fh lxic field E=50 $^{−1}$ over a distance of 2.0m.

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The graph shows the variation of the total electrxi;*8q;ow. m lxbtz 6c)b(fbx zl;/zqic potential due to two point electric chocx;8; l; zzq/) tz(m6*xbwf iblbq.xarges $q_1$​ and $q_2$ located 4.0m apart. The distance r is defined to be zero at the location of $q_1$.

What is the ratio of $\frac{q_1}{q_2}$

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The graph shows the variapzy0ij6op)c* w j3h s9tion of the electric potential due to a point charge as a function the distanppo )iwcyzjsj 6h930* ce r from its center.

Which of the following gives the work done by the electric field‾by the electric field​ on a charge of −3μC when it is moved from $r_1$​ to $r_2$​ ?

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35#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A conducting sphere has a radius ot u9 3+rc4wopn;wo :gof 20cm and a charge of +3.2μC. Point A is used to describe a location 20cm from the nu woo p;c+3r9 :ogwt4surface of the sphere.

1.Calculate the electric potential at the surface of the sphere. State the correct SI unit for your answer. V=    $\times10^5\,v$
2.(1)On the axes given, sketch the variation of the electric potential due to the sphere with distance from its surface‾from its surface​. Label point A on the graph you have drawn.


(2)Without calculation, outline how the electric field strength at A may be determined using the graph you have drawn
(3)A proton is initially held stationary at the surface of the sphere. The proton is moved from the surface of the sphere to point A. Calculate the work done on the proton. W =    $\times10^{-14}\,J$
3.The proton is released from point A. Outline the subsequent motion of the proton.

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two point charges are separated by a distance r as shown. +oep14v*h2q en,xhblwl a-y:

The negative charge's acceleration is 3 times that of the positive charge.
What is the ratio $\frac{Gravitational force​}{Electrostatic force}$ between the two point charges?

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Four point charges are placed as shown on the corners of a square. Chargo-3e,l*h;- j6b v ffqycpuxu /es of +2Q and −Q, and unknown charges A and B are locate;3cjyq -hufe6x*fb-l v, pu/od as shown on the diagram.

At the center of the square, the total potential is zero, but the resultant electric field is not zero.
Which of the following is a possible combination for the charges A and B?

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