2. Two identical charged conducting sphere are at a distance r = 30 cm. The attractive force F1 balls is 90 mN. After the balls have been brought into contact and separated from each other by the former distance, they have repelled with a force F2 = 160 mN, determine the charges Q1 and Q2, which have been on the balls to their contact. The diameter of the balls be considered a lot less distance between them.

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)