$A$ thin liquid film formed between a $U$-shaped wire and a light slider supports a weight of $1.5 \times 10^{-2} \, N$ (see figure). The length of the slider is $30 \, cm$ and its weight is negligible. The surface tension of the liquid film is (in $, N/m$)
- A$0.025$
- B$0.0125$
- C$0.1$
- D$0.05$
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