Electrostatics ...

Assertion The coulomb force is the dominating force in the universe.
Reason The coulomb force is weaker than the gravitational force.

Assertion A metallic shield in form of a hollow shell may be built to block an electric field.
Reason In a hollow spherical shield, the electric field inside it is zero at every point.

Assertion Electrons move away from a low potential to high potential region.
Reason Because electrons have negative charge.

Assertion If the distance between parallel plates of a capacitor is halved and dielectric constant is made three times, then the capacitance becomes 6 times.
Reason Capacity of the capacitor does not depend upon the nature of the materials

Assertion A parallel plate capacitor is connected across battery through a key. A dielectric slab of constant K is introduced between the plates. The energy which is stored becomes K times.
Reason The surface density of charge on the plate remains constant or unchanged.

Assertion Electric lines of force cross each other.
Reason Electric field at a point superimposes to give one resultant electric field.

Assertion If a proton and an electron are placed in the same uniform electric field. They experience different acceleration.
Reason Electric force on a test charge is independent of its mass.

Assertion Dielectric breakdown occurs under the influence of an intense light beam.
Reason Electromagnetic radiations exert pressure.

Assertion When charges are shared between any two bodies, no charge is really lost, but some loss of energy does occur.
Reason Some energy disappears in the form of heat, sparking etc.