Explain how does capacity of parallel plate capacitor change on introducing a conducting slab?

Explain how does capacitance of a 'parallel plate capacitor change on introducing a 'dielectric slab'?

The capacitance of a parallel plate capacitor increases with

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.

Assertion. Capacity of a parallel plate condenser remains unaffected on introduced a conducting or insulating slab between the plates. Reason. In both the cases, electric field intensity between the plates increases.