#slider length

A soap film supports 3.6×10−2N over a 60cm slider. What is the surface tension?

S = F2l. F = 3.6×10−2N, l = 0.6m. S = 3.6×10−22×0.6 = 0.03N/m. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 0.030 N/m. This satisfies dimensional consistency and physical conditions given, so option C is scientifically correct.

Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.