Решение задачи по физике раздел 73 пункт 80 электро

80. A ball of mass m and a charge q is suspended on a thread. When the same charged ball was brought up to it from below, then the thread tension force decreased by 4 times. Determine the distance between the centers of the balls.

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