44. A thin silk thread withstands a maximum tensile force T = 20 mN. A ball m = 0.40 g and a charge q1 = 12 nC is suspended on a thread. From below, along the suspension line, a ball is brought to it, the charge of which is q2 = −15 nC. Determine at what distance between the balls the thread breaks?

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