Question

A charge of +5 μC is placed at the centre of two concentric spheres of radii r₁ = 3 cm and r₂ = 5 cm. The ratio of the flux through sphere of radius r₁ to that through sphere of radius r₂ will be ______.

Options

• 5 : 3

• 3 : 5

• 9 : 25

• 1 : 1

Answer 1

A charge of +5 μC is placed at the centre of two concentric spheres of radii r₁ = 3 cm and r₂ = 5 cm. The ratio of the flux through sphere of radius r₁ to that through sphere of radius r₂ will be 1 : 1.

Explanation:

If the charges enclosed by the two surfaces are the same, then the flux through them would be the same, irrespective of their shape or size.