Electrostatics

Two test charges are brought separately into the vicinity of a charge +Q. First, test charge +q is brought to point A a distance r from +Q. Next, +q is removed and a test charge +2q is brought to point B a distance 2r from +Q. Compared with the electrostatic potential of the charge at A, that of the charge at B is ....

• greater

• smaller

• the same

Two test charges are brought separately into the vicinity of a charge +Q. First, test charge +q is brought to a point a distance r from +Q. Then this charge is removed and test

charge –q is brought to the same point. The electrostatic potential energy of which test charge is greater:

• +q

• -q

• It is the same for both.

An electron is pushed into an electric field where it acquires a 1-V electrical potential. Suppose instead that two electrons are pushed the same distance into the same electric field. The electrical potential of the two electrons is ....

• 0.25 V

• 0.5 V

• 1 V

• 2 V

• 4 V

A solid spherical conductor is given a net nonzero charge. The electrostatic potential of the conductor is ....

• largest at the center

• largest on the surface

• largest somewhere between center and surface

• constant throughout the volume

Consider two isolated spherical conductors each having net charge Q. The spheres have radii a and b, where b > a. Which sphere has the higher potential?

• the sphere of radius a

• the sphere of radius b

• they have the same potential