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Q.

A thin liquid film formed between a U-shaped wire and a light slider supports a weight of 1.5 × 10-2 N. The length of the slider is 30 cm and its weight negligible. The surface tension of the liquid film is

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a

0.0125Nm-1

b

0.1Nm-1

c

0.05Nm-1

d

0.025Nm-1

answer is D.

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Detailed Solution

At equilibrium, weight of the given block is balanced by force due to surface tension, i.e., 2L.T =W or T=W2L=1.5×10−2N2×0.3m=0.025Nm−1
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