If a negatively charged object has an excess of 2.5 x 10^19 electrons, its net charge is

1.6 C

2.5 C

6.5 C

4.0 C

A charged particle is placed in an electric field E. If the charge on the particle is doubled, the force exerted on the particle by the field E is

unchanged

doubled

quadrupled

halved

An object carrying a charge of -2 x 10^-6 C is acted upon by an electric force of 0.06 N. The magnitude of the electric field intensity at this point is

3 x 10^4 N/C

3 x 10^-5 N/C

1 x 10^2 N/C

3 x 10^3 N/C

Two point charges that are separated by a distance of 1.0 m repel each other with a force equal to 9.0 N. What is the force of repulsion when these two charges are 3.0 m apart?

1.0 N

27 N

3.0 N

81 N

If the charge on one of two positively charged spheres is doubled, the electrostatic force of repulsion between the spheres will be

halved

doubled

quartered

quadrupled

The electrostatic force of attraction between two small spheres that are 1.0 m apart is F. If the distance between the spheres is decreased to 0.5 m, the electrostatic force will then be

F/2

2F

F/4

4F

How much energy is required to move 3.2 x 10^-19 C of charge through a potential difference of 5 volts?

5 eV

2 eV

10 eV

20 eV

Moving 2.5 x 10^-6 C of charge from point A to point B in an electric field requires 6.3 x 10^-4 J of work. The potential difference between points A and B is approximately

1.6 x 10^-9 V

2.5 x 10^2 V

4.0 x 10^-3 V

1.0 x 10^14 V

The energy required to move one elementary charge through a potential difference of 5.0 volts is

8.0 J

8.0 x 10^-19 J

5.0 J

1.6 x 10^-19 J

If a 1.5-volt cell is to be completely recharged, each electron must be supplied with a minimum energy of