Assertion: Two concentric conducting spherical shells are charged. The charge on the outer shell is Varied keeping the charge on the inner shell constant, as a result, the electric potential difference between the two shells does not change.

Reason: If the charge is changed on a thin conducting spherical shell, the potential at all points inside the shell changes by the same amount.

Assertion: The electric potential and the electric field intensity at the centre of a square having four point charges at their vertices (as shown) are zero.

Reason: Electric field is a negative derivative of the potential.

Assertion : Positive charge always moves from a higher potential point to a lower potential point.

Reason : Electric potential is a vector quantity.

Assertion: On going away from a point charge or a small electric dipole, the electric field decreases at the same rate in both cases.

Reason: Electric field is inversely proportional to the square of the distance from the charge in all cases.

Assertion : The value of electric potential and electric intensity at the middle point of the line joining an electron and a proton is zero.

Reason : At mid point they cancel each other.

Assertion: No work is done in taking a positive charge from one point to other inside a positively charged metallic sphere while outside the sphere work is done in taking the charge toward the sphere.

Reason: Inside the sphere electric potential is the same at each potential, but outside it is different for different points.

Assertion: The whole charge of a conductor cannot be transferred to another isolated conductor.

Reason: The total transfer of charge from one to another is not possible.

Assertion : At a point in space, the electric field points towards north. In the region, surrounding this point the rate of change of potential will be zero along the east and west.

Reason : Rate of change of electric potential is along the direction of electric field.