A thin disc of radius R and mass M has charge q uniformly distributed on it. It rotates with angular velocity w. The ratio of magnetic moment and angular momentum for the disc is
(1) q/2M (2) R/2M (3) q^2/2M (4) 2M/q
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The formula to get angular momentum (L) is
L=Iw or L=
where
I= moment inertia for a disk which is
The formula for magnetic moment (M) is
Therefore the ratio of magnetic moment to angular moment is
M/L.
Therefore, the ratio is q/2m.
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