MHT CET Physics question
A drop of some liquid of volume is placed on the surface of a glass slide. Then, another glass slide is placed on it in such a way that the liquid forms a thin layer of area between the surfaces of the two slides. To separate the slides a force of dyne has to be applied normal to the surfaces. The surface tension of the liquid (in dyne ) is
Answer: (C)
Solution
Thickness of the layer cm; the film has two free surfaces, so , giving
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