重庆大学
第一章单元测试
- 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? ( )
- The motion of large bodies at great distances is governed primarily by gravity and not by the electrostatic force because ( )
- 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 ( ).
- All of the following are true about Gauss' law EXCEPT ( )
- Based on Gauss' Law, which of the following affects the electric flux through a Gaussian surface?( )
- 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?( )
- 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 ( )
- The negative derivative of electric potential with respect to radius is equal to （ ）
- 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? （ ）
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?
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?
A:The magnitude of the velocity will decrease, and its rate of decrease will also decrease.
B:The magnitude of the velocity will increase, and its rate of increase will also increase.
C:The magnitude of the velocity will increase, but its rate of increase will decrease.
D:The magnitude of velocity will increase, but its rate of decrease will increase.
E:The magnitude of the velocity will remain constant.
答案:The magnitude of the velocity will increase, but its rate of increase will decrease.
A:the electrostatic force is felt only over short distances
B:the electrostatic force is canceled out by the magnetic force
C:of the relative scarcity of antiparticles
D:the majority of matter is electrically neutral
E:gravity is a much stronger force than the electrostatic force
答案:the majority of matter is electrically neutral
A:
B:
C:2qF
D:
E:
答案:
A:Gauss' law refers to the flux through a closed surface.
B:Gauss' law is useful when the electric field is zero.
C:Gauss' law is useful when the electric field is perpendicular to the differential area.
D:Gauss' law states that the flux through the closed surface is proportional to the total charge within the surface.
E:A rectangle is an example of a Gaussian surface.
答案:A rectangle is an example of a Gaussian surface.
A:a stationary electric charge outside the surface
B:a stationary electric charge enclosed by the surface
C:a magnetic monopole enclosed by the surface
D:a charge moving with a constant velocity outside the surface
E:a magnetic dipole outside of the surface
答案:a stationary electric charge enclosed by the surface
A:plane and sphere
B:infinite line and sphere
C:plane and cylinder
D:infinite line and rectangle
E:plane and rectangle
答案:plane and cylinder
A:decreases.
B:is negative.
C:is positive.
D:electric fields cannot do work.
E:increases.
答案:decreases.
A:electric field
B:electric force
C:potential energy
D:charge
E:capacitance
答案:electric field
A:
B:
C:
D:
E:
答案:
A:E/9 B:E C:E/3 D:3E E:E/16
答案:E/16
A:
B:
C:
D:
E:
答案:
A:
B:
C:
D:
E:
答案:
A:
B:
C:
D:
E:
答案:
A:
B:
C:
D:
E:
答案:
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