(a) A phonograph record carries a uniform density of "static electricity" o. If it rotates at angular velocity , what is the surface current density K at a distance r from the center?

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(a) A phonograph record carries a uniform density of "static electricity" o. If it
rotates at angular velocity , what is the surface current density K at a distance
r from the center?
Transcribed Image Text:(a) A phonograph record carries a uniform density of "static electricity" o. If it rotates at angular velocity , what is the surface current density K at a distance r from the center?
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