Two balls, each of mass 0.50g are each suspendedd from an insulating thread 1.0m long. The upper ends of the threads are attached to the same point. When the balls are equally charged they repel each other and are in equilibrium when they are 30cm apart. Find the charge on the two balls. F = KQq/r^2 (where K is equal to 9x10^9) I really appreciate any help on this one. As I can't seem to find the answer. I know triganometry is involved and I know you need to find TcosΘ and TsinΘ and divide them but after that I'm completely stuck.