A thin wire ring of 1m. Is situated on the surface of a liquid. If the excess force required to lift it upwards (before the liquid film breaks) from the liquid surface is 8N, then the surface tension of liquid is :-(in N/m)

A thin wire ring of 1m. Is situated on the surface of a liquid. If the

1.	A thin wire ring of 1m. Is situated on the surface of a liquid. If the excess force required to lift it upwards (before the liquid film breaks) from the liquid surface is 8N, then the surface tension of liquid is :-(in N/m)
Answer» `(1)/(PI)` `(2)/(pi)` `pi` `2pi` ANSWER :B