# Worksheet: Using Coulomb's Law to Determine an Electrostatic Force

In this worksheet, we will practice determining the force a charge exerts on charges around it using Coulomb's law.

**Q5: **

If both the Earth and the Moon were each given a particular net charge , this would produce a repulsive force between them equal in magnitude to the attractive gravitational force between them. In considering the relationship of gravitational to electrical forces, model Earth and the Moon as point masses of kg and kg respectively.

Determine the magnitude of .

- A C
- B C
- C C
- D C
- E C

How many electrons would be required to produce the net charge sufficient to counteract the gravitational attraction between Earth and the Moon?

- A
- B
- C
- D
- E

**Q6: **

Two small identical conducting spheres repel each other with a force of 0.01 N when they are 0.45 m apart. After a conducting wire is connected between the spheres and then removed, they repel each other with a force of 0.10 N. What is the largest possible value of the total charge on the spheres before the conducting wire is connected between them?