(11%) Problem 3: A thin, flat ring (an annulus) with inner radius R and outer radius R2 is uniformly charged on one side with a surface charge density > 0. Refer to the figure. P h R R 17% Part (a) Select the correct expression for the magnitude of the electric field at point P, which is at height h over the plane of the ring above its center, as shown in the figure. E=2xko ++] Correct! A 17% Part (b) Calculate the magnitude of the electric field at P, in newtons per coulomb, for the parameter values R = 0.052 m, R2 = 0.16 m, = 0.23 10-4 C/m, and h = 0.17 m. E = || Grade Summary Deductions 0% Potential 100%