A rectangular film of liquid is extended from (4 cm ) to \((4 ~\text{cm}\times 5 ~\text{cm})\). If the work done is J, the value of the surface tension of the liquid is:
1. | 0.250 Nm-1 | 2. | 0.125 Nm-1 |
3. | 0.2 Nm-1 | 4. | 8.0 Nm-1 |
A rectangular film of liquid is extended from \((4~\text{cm} \times 2~\text{cm})\) to \((5~\text{cm} \times 4~\text{cm}).\) If the work done is \(3\times 10^{-4}\) J, the value of the surface tension of the liquid is:
1. \(0.250\) Nm–1
2. \(0.125\) Nm–1
3. \(0.2\) Nm–1
4. \(8.0\) Nm–1