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Q.

The velocity of a small ball of mass 'm' and density d1, when dropped in a container filled with glycerine, becomes constant after some time. If the density of glycerine is d2, then the viscous force acting on the ball, will be :

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a

mg1-d1d2

b

mgd1d2-1

c

mgd2d1-1

d

mg1-d2d1

answer is B.

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Detailed Solution

FV=mg-FB =mg-md1×d2g =mg1-d2d1
 

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