What is a parallel plate capacitor? Derive an expression for the capacitance of a parallel plate capacitor?

Derive an expression for capacitance of a parallel plate capacitor.

What is a capacitor? Derive an expression for capacitance of a parallel plate capacitor.

Derive an expression for energy density of a parallel plate capacitor.

Why is a parallel plate capacitor named so?

Define the capacitance of capacitor. Derive an expression for the capacity of parallel plate capacitor with a dielectric slab placed in between the plates of capacitor.