WBJEE 2014 Physics Solved Paper

A drop of some liquid of volume 0.04 cm3 is placed on the surface of a glass slide. Then another glass slide isplaced on it in such a way that the liquid forms a thin layer of area 20 cm2 between the surfaces of the two slides. Toseparate the slides a force of 16 × 105 dyne has to be applied normal to the surfaces. The surface tension of the liquidis (in dyne−cm–1)