Test Academy | A water drop of 0.05cm³ is squeezed between two glass plates and spreads into area of 40cm² . If the surface tension of water is 70 dyne/cm then the normal force required to separate the glass plates from each other will be 90 N, 45 N, 22.5 N, 450 N

Question

A water drop of 0.05cm³ is squeezed between two glass plates and spreads into area of 40cm² . If the surface tension of water is 70 dyne/cm then the normal force required to separate the glass plates from each other will be

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90 N
45 N
22.5 N
450 N

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