Решение задачи по физике раздел 73 пункт 89 электро

89. A small ball weighing 300 mg is suspended on a silk thread. The ball was given a charge of 3 ∙ 10−8 C. How close is it necessary to bring an equal charge to it so that the tension force of the thread is reduced by a factor of three?

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