Energy Stored & Force between Plates question from MHT CET 2026 (16 Apr, Shift 1)

Answer: (c)

1. Total field between plates $E = \frac{\sigma}{\varepsilon_0}$; half of it, $\frac{E}{2}$, is due to each plate.
2. A plate cannot push itself, so it feels only the other plate's field $\frac{E}{2}$.
3. $F = Q \cdot \frac{E}{2}$
4. So the answer is (c) $\frac{QE}{2}$.