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## Homework Statement

I don't understand how to apply coulombs law when there are 3 balls, giving each other charge. I know that the answer for part a) is 0.02N and part b) is 0.005 N but have no idea how to get these answers.

## Homework Equations

Two identical plastic balls A and B with a metallic coating are given identical but opposite charges and placed a fixed distance apart. There is found to be an attractive force of 0.04N between them. A third identical, but initially uncharged ball, C is now brought into contact with ball A and then removed.

a) what will be the force between A and B now

b) if ball c, still with the charge it obtained from ball a is now brought into contact with ball b and then removed, what will the force be between a and b now?

## The Attempt at a Solution

For part a) I tried substituting -1 and +1 for the charge but I still don't understand how the ball's A and C have transferred charge.

And for part b) I need to understand how to get part a) first