GENERAL KNOWLEDGE

Detailed explanation-1: -Capacitance is directly proportional to the dielectric constant and the distance between its plates and inversely proportional to the area of the plates.

Detailed explanation-2: -The larger the dielectric constant, the more charge can be stored. Completely filling the space between capacitor plates with a dielectric, increases the capacitance by a factor of the dielectric constant: C = KCo, where Co is the capacitance with no slab between the plates.

Detailed explanation-3: -The amount of charge stored in a capacitor is directly proportional to the voltage applied across the capacitor.

Detailed explanation-4: -Introducing a dielectric into a capacitor decreases the electric field, which decreases the voltage, which increases the capacitance. A capacitor with a dielectric stores the same charge as one without a dielectric, but at a lower voltage. Therefore a capacitor with a dielectric in it is more effective.