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MHT CET 2020 (16 Oct, Shift 2) · Force due to Surface Tension

Force due to Surface Tension question from MHT CET 2020 (16 Oct, Shift 2)

Q18MHT CET 2020 · 16 OCT · SHIFT 2Easy

Force due to Surface Tension

A square frame of each side $L$ is dipped in a soap and taken out. The force acting on the film formed is ( $T =$ surface tension of soap solution)

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Answer: (a)

A film has two surfaces, so $F = 2T \times \text{perimeter}$ .
$F = 2T(4L) = 8TL$ .
So the answer is (a) $8TL$ .

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