Compute all parts of given question:
Question: A cork ball of mass m=5grams, carrying a charge of q=-2uC, is suspended from a string length l=1m above the horizontal, uniformly charged plate of charge density o=1uC/m2. The ball is displaced from the vertical by a small angle and allowed to swing.
Part A: Show that the ball moves in simple harmonic motion.
Part B: Calculate the angular frequency of this motion.
I need help to determine the angular frequency of this motion.