The diagram illustrates two parallel plates. They are charged in such a way that an electric field exists between them. P, Q and R are points located at $\frac{1}{4}$, $\frac{1}{2}$ and $\frac{3}{4}$ of the separation from the top plate down to the bottom plate. What is the electric field strength at point P?
- Athe same as that at point Q
- Btwice that at point R
- Chalf that at point R
- Done third that at point Q