A straight piece  of wire 4 cm long is placed horizontally  on the surface  of water annd is
Channel: Doubtnut
Date: 14/06/2020

A straight piece  of wire 4 cm long is placed horizontally  on the surface  of water annd is gently pulled up . It is found that a force of 560  dyne in addition to the weight of the wire is required  for this purpose . Then surface tension of the water is