Question
A film of water is formed between two straight parallel wires of length 10cm each separated by 0.5cm. If their separation is increased by 1 mm while still maintaining their parallelism, how much work will have to be done (Surface tension of water = 7.2 x 10⁻² N /m)
Options :
7.22 x 10⁻⁶ J
1.44 x 10⁻⁵ J
2.88 x 10⁻⁵ J
5.76 x 10⁻⁵ J
Answer :
1.44 x 10⁻⁵ J
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