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Fine particles of sand are shaken up in water contained in a tell cylinder. If the depta of water in the cylinder is 24 cm, calculate the size of the largest particle of sand that can remain suspended after the expiry of 40 minutes. Given density of sand =`2.6 g cm^(-3)` and viscosity of water = 0.01 poise. Assume that all the particles are spherical and are of different sizes.

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