The dimensions of torque are the same as that of

Turpentine oil is flowing through a tube of length $l$ and radius $r$. The pressure difference between the two ends of the tube is $P$. The viscosity of oil is given by $\eta = \frac{P(r^2 - x^2)}{4vl}$,where $v$ is the velocity of oil at a distance $x$ from the axis of the tube. The dimensions of $\eta$ are

Dimensions of the coefficient of viscosity are

Select the pair whose dimensions are the same.

$\left[ML^2 T^{-2} K^{-1}\right]$ is the dimensional formula of which physical quantity?

The dimensional formula of potential difference is ........