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[" A thin circular disk of radius "R" is...

[" A thin circular disk of radius "R" is uniformly charged with density "sigma>0" per unit are "(1)/(1)" Ares "2" of "],[" about its axis with a uniform angular speed "omega" .The magnetic moment of the disk is "],[[" (A) "2 pi R^(4)sigma omega," (B) "pi R^(4)sigma omega," (C) "(pi R^(4))/(2)sigma omega," (D) "(pi R^(4))/(4)sigma_(0)]]

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