53. In an electric field, the intensity vector of which is directed horizontally and modulo equal to 2000 V / m, a thread with a small charged ball suspended on it deviated at an angle of 45 ° from the vertical. The mass of the ball is 2.8 g. What is the charge of the ball? Express the answer in microcoulombs.

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