Would I be able to detect E field around magnet spinning on its axis using electroscope? I like to use electronic electroscope in setup like this:
I think the question is equivalent to asking whether there is B field when you have a rotating electret. Which is equivalent to two rotating surface current density. And the answer is yes, there is B field in the radial and axial direction when the thickness of the electret has a finite thickness. But for an ideal electret of zero thickness there will be no B field.
So I think for a real magnet with finite thickness, there will be E field in the radial and axial direction. But when thickness of the magnet is very small, the E field vanishes.