The equation you use to solve the magnitude of the electric field at a point between two oppositely charged plates is qE=F right? Because I tried that and I did not get the answer. Heres the question. The two oppositely charged plates are 5.00mm apart and the point P is 2.00mm from the positively charged plate. If the potential difference between them is 450V, what is the magnitude of the electric field at point P?

Any help would be greatly appreciated.

Thanks