Previous Year Question- Gausss Law In Electrostatics

• Question: A point charge Q is placed at the centre of a spherical Gaussian surface of radius R. If the radius of the Gaussian surface is doubled, the electric flux passing through the Gaussian surface will (A) remain the same (B) be halved (C) be doubled (D) be quadrupled

Answer: (A)

Explanation: Electric flux is defined as the number of electric field lines passing through a given area. The electric field lines are radially outward from the point charge. Since the number of electric field lines does not change when the radius of the Gaussian surface is doubled, the electric flux through the Gaussian surface will remain the same.