$A$ water film is formed between two straight parallel wires,each of length $10 \text{ cm}$,kept at a separation of $0.5 \text{ cm}$. Now,the separation between them is increased by $1 \text{ mm}$ without breaking the water film. The work done for this is (surface tension of water $= 7.2 \times 10^{-2} \text{ N/m}$)
- A$7.22 \times 10^{-6} \text{ J}$
- B$5.76 \times 10^{-5} \text{ J}$
- C$1.44 \times 10^{-5} \text{ J}$
- D$2.88 \times 10^{-5} \text{ J}$
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