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Q.
The dimensions of $\left(\frac{ B ^2}{\mu_0}\right)$ will be :
(if $\mu_0$ : permeability of free space and
B : magnetic field)
JEE MainJEE Main 2022Physical World, Units and Measurements
Solution:
$ u =\frac{ B ^2}{2 \mu_0} $
$ u \rightarrow $ Energy per unit volume
$ {\left[\frac{ B ^2}{\mu_0}\right]=[ u ]=\frac{\left[ ML ^2 T ^{-2}\right]}{\left[ L ^3\right]}=\left[ ML ^{-1} T ^{-2}\right]}$