93. A ball weighing 2 g, having a charge of 3 ∙ 10−8 C, is motionlessly hanging on a silk thread in the air. If another ball with the same charge of 2 ∙ 10−7 C is placed under the ball at a distance of 10 cm from it, then what is the tension of the thread equal to?

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