Re: Magnetic field and relative motion
From: Bilge (dubious_at_radioactivex.lebesque-al.net)
Date: 06/16/04
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Date: Wed, 16 Jun 2004 05:26:08 -0000
V.K.Tamhane:
> For an observer on the disc, the circuit ABCED is
>rotating in the opposite direction and so he concludes that emf is
>produced in this circuit.
Do a calculation for once. The observer onthe disk sees an electric
field in the radial direction of the disk, since that observer is
moving at some velocity relative to the B field (which is no different
than the B field moving relative to the observer):
E' = \gamma\beta x B
\beta = w x r/c, \beta x B = (1/c)(w x r) x B = w.B r/c
E' = w.Br/sqrt(c^2 - (wr)^2)
Integrate that to the potential difference between the rim and axle.
[*other nonsense without calculations, snipped*]
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