two positively charged sphere have combined charged of 0.5microcolumb and repulsive force of 1.0newton and it's distance separation is2.0meter.what is the charge of each spheres?

Answer 1

F = k * (q1 * q2) * (1/r^2)

Where k is a constant = 9 * 10^9
q1 and q2 are the individual charges, and r is the distance between them.

When you plug in the given values, you will get an equation of the type:
q1 * q2 = something

Combine this with (q1 + q2 = 0.5 microcolumb), and you'll have your answer.