Two concentric spherical surfaces P and Q are equipotential surfaces for a positive point charge placed at their common centre. If another point charge +Q is placed between P and Q, the new charge will move from

Question

Question

Answer 1

The correct answer is option 1) i.e. P to Q

CONCEPT:

Equipotential surface: The surface on which if all points are at the same electric potential is known as the equipotential surface.
Electric potential: The electric potential is the difference in potential energy per unit charge between two points in an electric field.

The electric potential (V) at a distance r from a point charge Q is given as:

\(V = \frac{kQ}{r}\)

Where k is Coulomb constant.

EXPLANATION:

Electric potential \(V \propto \frac{1}{r}\)

Thus, the potential at surface P is greater than the potential at surface Q.
A charge moves from a point of higher potential to a point of lower potential. Thus, it will move from surface P to Q.