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JEE Main 2022 Physics question

PhysicsMechanical Properties of FluidsJEE Main 2022

A water drop of radius 1 cm is broken into 729 equal droplets. If surface tension of water is 75 dyne/cm, then the gain in surface energy upto first decimal place will be : (Given )

Answer: (3)

Solution

Conservation of volume: , so R = 9r and r = 1/9 cm. The gain in surface energy is $Δ U = SΔ A = S ×

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Question ID VK-025118