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stunner5000pt
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Homework Statement
A phonograph record of radius R carrying a unifrom surface charge sigma is rotating at a cosntant angular velocity omega. Find its magnetic dipole moment
Homework Equations
[tex] m = int I \bullet da [/tex]
The Attempt at a Solution
Need to find the current first
well the sruface charge density is
[tex] K = \sigma \omega R [/tex]
[tex] K = \frac{dI}{dl_{perp}} [/tex]
where dl perp is the infinitesimal widthruning parallel to the flow of current
so here dl perp refers to circumference
[tex] I = \int K \bullet 2 \pi r dr [/tex]??
is this even close to being right??
I fear i may have made some geomterical error..
thanks for your help!
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