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Q.
A steel ball is dropped in oil, then
BHUBHU 2011
Solution:
According to stokes, when a spherical body falls through a viscous fluid. It experiences a viscous force. The magnitude of the viscous force, increases with the increase in velocity of the body falling under the action of its weight. As a result, the viscous force soon balances the driving force (weight of the body) and the body starts moving with a constant velocity know as its terminal velocity.