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A drop of water of 0.2 g mass is placed ...

A drop of water of 0.2 g mass is placed between two well cleaned glass plates, the distance between which is 0.01 cm. Find the force of attraction between the plates,

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Suppose the drop spreads evenly and as seen from above has the shape of a circle of radius R (Fig. 21.9). The area of this circle is `S = V//d = m//rhod`. The force of Fig. 21.7. attraction between the plates is `F = DeltapsS` where `Deltap= 2 sigma//d` is the excess pressure under the curved surface. Therefore
`F=2sigma m// rho d^(2)`
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