What is meant by a dielectric ? Explain how it reduces the electric field between two oppositely charged plates, if the space between them be filled with it?

The dielectric between the conductors reduces the electric intensity

What is meant by electric lines of force represent ? Explain repulsion between two like charges on their basis.

How does the force of gravitation between two objects change when the distance between them is reduced to half ?

Find the electric intensity at a point in between two parallel opposite charged infinite sheets.

Define dielectric constant of a medium in terms of fore between two electic charges.

Assertion : The electrostatic force between the plates of a charged isolated capacitor decreases when dielectric fills whole space between plates. Reason : The electric field between the plates of a charged isolated capacitance decreases when dielectric fills whole space between plates.

A parallel plate capacitor with air between the plates has a capacitance of 8 pF.What will be the capacitance if the distance between the plates is reduced by half and the space between them is filled with a substance of dielectric constant 5?