alt Hacker News> Picture yourself inside a gigantic, electrified sphere – akin to a Van De Graff generator. If your charge polarity matches that of the sphere, you'll experience a repulsive force.
This is not correct. The field inside a charged conductor is zero. You will experience no force. If there is a hole in the sphere you will experience a repulsive force if you are close to the hole (compared to its size).
Yes, just like with Newtonian gravity. Any inverse-square law force will be zero inside a spherical shell. The higher force from parts of the shell closer to you is exactly canceled out by the farther parts exerting less force but there being more of those farther parts.
https://en.m.wikipedia.org/wiki/Shell_theorem