Recent content by jackyyoyoyo

You are right! and the charge is uniformly distributed.

Thanks for answering my question. I think I lack of consideration on whether the sphere is conducting or insulating. The conducting sphere will have E=0 while the insulating sphere will have E=keQr/a^3

I'm confused with the electric field inside a sphere. The book said that E=keQr/a^3 While one of the properities of electrostatic equilibrium mentioned that the E-field is zero everywhere inside the conductor. Are there any exceptional cases? Thanks in advance.

Thanks for response Now I can figure out why I'm trapped

I'm studying relation between conservative force and potential energy,and getting a big question on change in potential energy is always negative. For gravitational PE ,when an object is lifting up, it's work done is negative(opposite direction). so the change in work done is negative. On the...