A large drop of oil (density 0.8 g / cm 3 and viscosity η 0 ) floats up through a column of another liquid (density 1.2 g / cm 3 and viscosity η L ). Assuming that the two liquids do not mix, the velocity with which the oil drop rises will depend on:

Question

A large drop of oil (density 0.8 g / cm 3 and viscosity η 0 ​ ) floats up through a column of another liquid (density 1.2 g / cm 3 and viscosity η L ​ ). Assuming that the two liquids do not mix, the velocity with which the oil drop rises will depend on:, η 0 ​ only, η L ​ only, both on η 0 ​ and η L ​, neither η 0 ​ nor η L ​

MARKS App · Accepted Answer

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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