Question

Parallel plate capacitor of a capacitance of 1 farad would have the plate area of

Answer 1

Let a parallel-plate capacitor, with area Aand separation d, have plates with charge density ±σ, so the electric field magnitude E0 = 4πkσ. (We neglect edge effects.) Now introduce a slab of dielectric (e.g., wood or glass) that just fits into the capacitor. Its molecules become polarized.