Question: What is the force between two charges of 1 microcoulomb each, separated by a distance of 0.5 meters?

Options:

1. 0.36 N
2. 0.72 N
3. 0.18 N
4. 0.09 N

Correct Answer: 0.36 N

Solution:

Using Coulomb\'s law, F = k * |q1 * q2| / r^2. Here, F = (8.99 x 10^9) * (1 x 10^-6)^2 / (0.5^2) = 0.36 N.