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A large drop of oil, whose density is less than that of water, floats up through a column of water. Assume that the oil and the water do not mix. The coefficient of viscosity of the oil is η0 and that of water is ηw. The velocity of the drop will depend on (a) both η0 and ηw (b) η0 only (c) ηw only (d) neither η0 nor ηw |
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Answer» Correct Answer is: (c) ηw only Forces of viscosity arise in a fluid when different sections of the fluid move with different velocities. Here, there is no such motion inside the oil drop and hence the viscosity of oil does not come into play. |
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