Two glass plates are separated by water. If the surface tension of water is 75 dyne/cm and the area of each plate wetted by water is 8cm2 and the distance between the plates is 1.2 cm, then the force applied to separate the two plates is
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Solution
Excess pressure inside a liquid is
P=T(1r1+1r2)
where, r1 and r2 is radius in perpendicular directions