1、单选题：
A charge +Q is fixed in position as a small charge +q is brought near it and released from rest. Which best describes the magnitude of the velocity of the charge +q as r, the distance between the charges increases? ( )
选项：
A:The magnitude of the velocity will remain constant.
B:The magnitude of the velocity will increase, and its rate of increase will also increase.
C:The magnitude of the velocity will decrease, and its rate of decrease will also decrease.
D:The magnitude of velocity will increase, but its rate of decrease will increase.
E:The magnitude of the velocity will increase, but its rate of increase will decrease.
答案: 【The magnitude of the velocity will increase, but its rate of increase will decrease.】

2、单选题：
The motion of large bodies at great distances is governed primarily by gravity and not by the electrostatic force because ( )
选项：
A:the majority of matter is electrically neutral
B:of the relative scarcity of antiparticles
C:gravity is a much stronger force than the electrostatic force
D:the electrostatic force is canceled out by the magnetic force
E:the electrostatic force is felt only over short distances
答案: 【the majority of matter is electrically neutral】

3、单选题：
An object with a charge of –2q feels a force of F when put at a point P in an electric field. In terms of F and q, the strength of the electric field at this point is ( ).
选项：
A:2qF
B:

C:

D:

E:

答案: 【
】

4、单选题：
All of the following are true about Gauss' law EXCEPT ( )
选项：
A:Gauss' law is useful when the electric field is zero.
B:Gauss' law refers to the flux through a closed surface.
C:Gauss' law states that the flux through the closed surface is proportional to the total charge within the surface.
D:A rectangle is an example of a Gaussian surface.
E:Gauss' law is useful when the electric field is perpendicular to the differential area.
答案: 【A rectangle is an example of a Gaussian surface.】

5、单选题：
Based on Gauss' Law, which of the following affects the electric flux through a Gaussian surface?( )
选项：
A:a stationary electric charge outside the surface
B:a charge moving with a constant velocity outside the surface
C:a magnetic monopole enclosed by the surface
D:a magnetic dipole outside of the surface
E:a stationary electric charge enclosed by the surface
答案: 【a stationary electric charge enclosed by the surface】

6、单选题：
Which of the following pairs of charge distributions and Gaussian surfaces are correctly paired such that the Gaussian surface can be used to find the electric field associated with that charge distribution?( )
选项：
A:plane and sphere
B:plane and cylinder
C:infinite line and sphere
D:plane and rectangle
E:infinite line and rectangle
答案: 【plane and cylinder】

7、单选题：
If the electric field does positive work on a negative charge as the charge undergoes a displacement from point A to point B within an electric field, then the electrical potential energy ( )
选项：
A:decreases.
B:increases.
C:is positive.
D:electric fields cannot do work.
E:is negative.
答案: 【decreases.】

8、单选题：
The negative derivative of electric potential with respect to radius is equal to （ ）
选项：
A:electric field
B:potential energy
C:capacitance
D:charge
E:electric force
答案: 【electric field】

9、单选题：
The potential difference due to a finite rod along the x-axis is given by the equation V(x) = C[ln(x + L) – ln(x)], where C and L are constants. What is the electric field due to this rod? （ ）
选项：
A:

B:

C:

D:

E:

答案: 【
】

10、单选题：

Point A is a distance L to the left of a charge Q. Point B is a distance 3L to the left of point A. If the electric field at point A due to charge Q is E, what is the electric field at point B?
选项：
A:E/16
B:E/9
C:E/3
D:3E
E:E
答案: 【E/16】

11、单选题：

选项：
A:
B:
C:
D:
E:
答案: 【】

12、单选题：
Two solid spheres, both of radius 5 cm, carry identical total charges of 2 nC. Sphere A is a good conductor. Sphere B is an insulator, and its charge is distributed uniformly throughout its volume. How do the magnitudes of the electric fields they separately create at a radial distance of 6 cm compare?
选项：
A:
B:
C:
D:
E:
答案: 【】

13、单选题：

选项：
A:
B:
C:
D:
E:
答案: 【】

14、单选题：

选项：
A:
B:
C:
D:
E:
答案: 【】