Question

The surface tension of a liquid is 10 N/m. If a thin film of the area 0.05 m² is formed on a loop. Then the surface energy will be:

Options

• 5 J

• 3 J

• 2 J

• 1 J

Answer 1

1 J

Explanation:

Surface energy = S × ΔA = 2 × 10 × 0.05 = 1 J ...(Because film has two surfaces)