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

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

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

Derive an expression for the capacitance of a parallel plate capacitor with dielectric as the medium between the plates.

Derive an expression for the capacitance of a parallel plate capacitor. How is the capacitance affected when a conducting slab is introduced in-between its plates? Explain