A 0.80 g cork ball with a charge of 1.50 µC is suspended vertically on a 0.300 m long light string in the presence of a uniform, downward-directed electric field of magnitude E = 1.00*105 N/C. If the ball is displaced slightly from the vertical, it oscillates like a simple pendulum.
a) Decide the period of this oscillation.
T = s
b) By what percentage does the inclusion of gravity affect the period?
Percent