Re: Charged spinning disks

On May 16, 8:23 pm, RP <no_mail_no_s...@xxxxxxxxx> wrote:

That view is incorrect as well. In ordinary conductors there are two
currents, one of positive charge and one of negative charge.

How did the disk get changed to an "ordinary conductor"? We are
talking about an isolated charged spinning disk. This disk is
presumably an insulator which causes the charges to spin with it. If
there are both resinous and vitreous charges in the material of the
disk they cancel at all times and move together. Hence the disk is
equivalent to isolated circulating charge and my statements stand.

Of course since you note that a B field from a conductor can't be
transformed away, that means that B fields from currents in wires are
"real" while B fields from circulating charges are not. This is an
interesting result!

[snip irrelevant answer to some other question]



.

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