A small plastic ball of mass 7.51 × 10-3 kg and charge +0.123http://edugen.wileyplus.com/edugen/courses/crs6407/art/qb/qu/c18/lower_mu.gifC is suspended from an insulating thread and hangs between the plates of a capacitor (see the drawing). The ball is in equilibrium, with the thread making an angle of 30.0o with respect to the vertical. The area of each plate is 0.02109 m2. What is the magnitude of the charge on each plate?
electric field= q/EoA
electric force= qE
The Attempt at a Solution
I have found the electric field and the force from above equations, I just get lost on how to go from here.