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A thin square plate of side 5cm is suspe...

A thin square plate of side 5cm is suspended vertically from a balance so that lower side just dips into water with side parallel to surface. When the plate is clean `(theta = 0^@ )`, it appears to weigh 0.044N. But when the plate is greasy `( theta = 180^@ )`, it appears to weigh 0.03N. The surface tension of water is `sigma (10^(-2) Nm^(-1) )`. Find `sigma `

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