I need to find Fe so that I can use it to find the charge of the of the ping pong ball. Fe is the force pushing the ball away, Fg and T are holding it static. So that should mean that T + Fg = Fe?
TL;DR Summary: Ping-pong ball hanging static from infinite plane of charge and a string
Really struggling with this question. I'm not sure if I have set up the free body diagram correctly and don't know how to set up the x and y components