Posted by **Anonymous** on Thursday, February 21, 2013 at 3:42am.

A flat thin non-conducting ring has an inner radius R1 and an outer radius R2 . The disk is uniformly charged with charge per unit area σ(>0) .

(a) What is the electric field at the center, P, of the ring? Express your answer in terms of the following variables, if necessary, R1, R2, σ and the constant ϵ0 (if needed, enter pi for π, epsilon_0 for ϵ0, sigma for σ, R_1 for R1 .. etc).

(b)What is the magnitude of the electric field at point A which is a distance x above the point P? The line AP is perpendicular to the plane of the ring. Express your answer in terms of the following variables, if necessary, R1, R2, σ, x and the constant ϵ0 (if needed, enter pi for π, epsilon_0 for ϵ0, sigma for σ, R_1 for R1 .. etc).

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