A thin liquid film formed between a \( U \) shaped wire and a light slider supports a weight of ....

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A thin liquid film formed between a \( U \) shaped wire and a light slider supports a weight of \( 1.5 \times 10^{-2} \mathrm{~N} \),
\( \mathrm{P} \)
as shown in the figure. The length of the slider is 30 \( \mathrm{cm} \) and its weight negligible. The surface tension of the liquid film is
(1) \( 0.0125 \mathrm{~N} / \mathrm{m} \)
(2) \( 0.1 \mathrm{~N} / \mathrm{m} \)
(3) \( 0.05 \mathrm{~N} / \mathrm{m} \)
(4) \( 0.025 \mathrm{~N} / \mathrm{m} \)


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