Q.

When a sphere falling in a viscous fluid attains the terminal velocity, then

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a

The net force on the sphere acts down wards

b

The viscous retarding force plus the buoyant force equals the weight of the sphere. 

c

The viscous retarding force pluse the weight of the sphere equals the buoyant force

d

The buoyant force is zero and viscous force equals the weight of the sphere

answer is B.

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