Решение задачи по физике раздел 73 пункт 99 электро

99. A ball weighing 150 g is suspended on a silk thread and has a charge of 10 nC. At a distance of 30 cm from it, another ball is placed below. What should be the charge of this ball 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)