(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?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F5cacf114-1548-412d-ab48-9f4d3b4e5e45%2F83e1fa6f-dd1b-4182-bf45-357de1e556f2%2Fdfkfdb_processed.png&w=3840&q=75)
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