Question: A solid sphere of radius R carries a charge density 0 in the region r = 0 to r = R s and an

A solid sphere of radius R carries a charge density –ρ₀ in the region r = 0 to r = R_s and an equal charge density of opposite sign, +ρ₀, between r = R_s and r = R. The net charge carried by the sphere is zero.

(a) What must be the ratio R/R_s?

(b) If this sphere rotates with angular velocity ω about its diameter, what is its magnetic moment?

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