Re: ORIGINAL simple magnets question

[paul o johnson <pojhome@FLASH.NET>]

Leigh

In my  reply to Beaty's original question about a magnetized disk, I said the B field has radial components everywhere except in the plane of the disk. I mentioned nothing about a purely radial field.

poj

Leigh Palmer wrote:

I don't remember when I missed it, but someone suggested that a disk
magnet spinning on its axis of symmetry might have a radial electric
field. Application of Gauss's law should convince one that a purely
radial electric field cannot exist in a radially symmetric geometry
for which translational symmetry holds in the direction of the axis
unless there is a nontrivial radially symmetric distribution of
electric charge. While this is not the situation in the complicated
case under discussion here, reflection on gaussian surfaces can be
enlightening.

Leigh