A solid sphere of radius R carries a charge density –ρ0 in the region r = 0 to r = Rs and an equal charge density of opposite sign, +ρ0, between r = Rs and r = R. The net charge carried by the sphere is zero.
(a) What must be the ratio R/Rs?
(b) If this sphere rotates with angular velocity ω about its diameter, what is its magnetic moment?
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