Let $x = \pi R \left( \frac{P^2 - Q^2}{2} \right)$,where $P, Q$ and $R$ are lengths. The physical quantity $x$ is

The dimensional formula of permeability of free space $\mu_0$ is

Which of the following pairs of physical quantities has the same dimensions?

The dimensional formula of capacitance is . . . . . . . Take $Q$ as the dimensional formula of charge.

If mass $(M)$,length $(L)$,time $(T)$,and electric current $(A)$ are taken as fundamental quantities,then the dimensional formula of permittivity $(\epsilon_0)$ is:

Dimensions of the coefficient of viscosity are