A small charged ball is suspended by a string in a uniform electric field E. The ball is in equilibrium when the string makes an angle = 18 with the vertical. The tension in the string at equilibrium is T=0.1 N. (Take g = 10 m/s) (a) Calculate the mass m of the ball. (b) Calculate the force exerted by the electric field on the ball. (F= ?) (c) If the charge of the ball is q = -6 x 107 C, find the direction and the magnitude of the electric field. 18 mg FE X