2. A ball of mass m = 50 mg is suspended on a non-conductive thread and has a charge q = 10–8 C. At a distance of L = 32 cm from it, another ball is brought from below. What should be the charge of this ball so that the tension of the thread increases n = 2 times?

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