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Physics-Surface Tension

NEET Physics Surface Tension MCQ Question

Type: MCQ-diagram based-Hard-Class 11

Consider a horizontal liquid film ending in a bar free to slide over parallel guides, as described in the NCERT context. If the bar is moved by a small distance d, resulting in the area of the surface increasing, which expression correctly represents the surface tension S of the film?

Question diagram
A

S = F/2l

B

S = 2F/l

C

S = Fd/2l

D

S = 2Fd/l

Correct Answer

Option A

Detailed Explanation

The surface tension S is given by the expression S = F/2l, where F is the force applied and l is the length of the film. This is derived from the additional energy stored in the film due to the increased surface area.

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