PHYS 2426 Engineering Physics II Problem 22.9 1. Charge Q is distributed uniformly around a circular arc of radius R subtending an angle o at the center of curvature as shown in the figure. Take the x axis to be the axis of symmetry. (a) Calculate the net electric field at the center of the arc in terms of d, R and p. (b) Let the angle d -/2. This will give you the electric field of a semicircular arc. (c) If R = 1.00 m, how large should the charge Q be in order for the electric field at the center to exceed the dielectric strength of air which is Emax = 3.00 x 106 V /m?