Physics - Electrostatics Question with Solution | TestHub

Below the fixed end of the insulating horizontal thread, there is a fixed charge A of $20\mu$C, which is the same as the charge of the small body B of mass $m$ at the end of the thread, as shown in the figure. The body B is released, and when it is at the lowest position, the thread is vertical. Assume that the thread does not strike the fixed charge. The body B comes to a stop at the lowest position.(Take g=10$\frac{m}{s^2}$)