A cubical block of side $‘a’$ and density ‘$\rho $’ slides over a fixed inclined plane with constant velocity $‘v’$. There is a thin film of viscous fluid of thickness $‘t’$ between the plane and the block. Then the coefficient of viscosity of the thin film will be
A cubical block of side $‘a’$ and density ‘$\rho $’ slides over a fixed inclined plane with constant velocity $‘v’$. There is a thin film of viscous fluid of thickness $‘t’$ between the plane and the block. Then the coefficient of viscosity of the thin film will be
- A
$\frac{{3\rho agt}}{{5v}}$
- B
$\frac{{4\rho agt}}{{5v}}$
- C
$\frac{{\rho agt}}{{v}}$
- D
none of these
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