Задача 30198.

A ball of mass m and charge q, suspended on a non-conducting thread of length l, rotates around a vertical axis so that the thread makes an angle a with the vertical. Determine the period of revolution of the ball and the tension force of the thread if a stationary point charge q is located in the center of the circle described by the ball.

Detailed solution with a brief record of the conditions, formulas and laws used in the solution, derivation of the calculation formula and answer.
If you have any questions regarding the solution, please write. I try to help.