Recent content by stanlee

Can you derive this formula in detail or some website I can learn by myself? Thank you very much!

Then every images should have negtive charge in the up semi-cylindrical and positive in the bottom semi-cylindrical.

If there is only a vertical electric field, can you show me the charge distributed in there surface? And is the current equals to zero in first image? Why?

I don't know whether this is correct.

Maybe I should use this?