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A coin of thickness x is half immersed in a liquid of surface tension T. Circular surface of the coin is vertical. Angle of contact between liquid and metal with which coin is made is 60°. If radius of the coin is r, surface tension force on coin by liquid is, (1) 4T(2r + x) upwards (2) 4T(2r + x) downwards (3) 2T(2r + x) upwards (4) 2T(2r+x) downwards (5) T(2r + x) downwards
Sagot :
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