Решение задачи по физике раздел 74 пункт 9 электро

9. A ball of mass m = 2 g, having a charge q = 5 ∙ 10−7 C, is suspended on an insulating thread. At what distance r from below should the same charge be placed so that the tension force of the thread is reduced by half?

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