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  4. A small spherical body of radius r and density  moves with the terminal velocity v in a fluid of coefficient of viscosity η and density σ. What will be the net force on the body ?

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Q. A small spherical body of radius r and density  moves with the terminal velocity v in a fluid of coefficient of viscosity $\eta$ and density $\sigma$. What will be the net force on the body ?

WBJEEWBJEE 2019Mechanical Properties of Fluids

Solution:

$V_{terminal} \Rightarrow F_{net} =0$