A film of water is formed between two straight parallel wires each 10cm long and at a separation 0.5cm. Calculate the work required to increase 1 mm distance between them. Surface tension of water `=72xx10^(-3)N//m`

Answer

`1.44 xx 10^(-5)J`

Explanation

Work `= ( 2 xx 0.1 xx 6 xx 10^(-3) -2 xx 0.1 xx 5 xx 10^(-3)) xx 0.0 72 = 1.44 xx 10^(-5) J`