A drop of water volume 0.05 \(\displaystyle cm^{3}\) is pressed between two glass-plates as a co...

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A drop of water volume 0.05 \(\displaystyle cm^{3}\) is pressed between two glass-plates as a consequence of which it spreads and occupies an area of 40 \(\displaystyle cm^{3}\). If the surface tension of water is 70 dyne/cm, find the normal force required to separate out the two glass plates in Newton
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