Q 11-01-190JEE MainJEE Main 2021 (27 Aug, Shift 1)Easy
Which of the following is not a dimensionless quantity?
Answer: (C) Permeability of free space $(\mu_0)$
Power factor ($\cos\phi$), quality factor and relative permeability are pure ratios.
$\mu_0$ has unit T m A$^{-1}$, dimensions $[\text{MLT}^{-2}\text{A}^{-2}]$, so it is not dimensionless.
Solution by Sreeraj P, M.Sc Physics