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Question

A soap film supports 4.0×10−2N over a 40cm slider. What is the surface tension?

Options

Choose one · Correct answer highlighted

Explanation

S = F2l. F = 4.0×10−2N, l = 0.4m. S = 4.0×10−22×0.4 = 0.05N/m. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 0.05 N/m. This satisfies dimensional consistency and physical conditions given, so option C is scientifically correct.