GENERAL KNOWLEDGE

Detailed explanation-1: -When the dielectric medium is filled in the space between the plates of the parallel plate capacitor, its capacitance increases by K times. Hence, option 1 is correct.

Detailed explanation-2: -The capacitance of a parallel plate capacitor depends on area of each plate, dielectric medium between the plates and distance between the plates.

Detailed explanation-3: -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-4: -The capacitance of a capacitor reduces with an increase in the space between its two plates. The electrostatic force field that exists between the plates directly relates to the capacitance of the capacitor. As the plates are spaced farther apart, the field gets smaller.