જયાં $B$ = ચુંબકીય ક્ષેત્ર, $l$ = લંબાઇ ,$m$ =દળ
$\therefore \,\,{\rm{Dimension}}\,{\rm{of}}\,{\rm{[}}B{\rm{]}} = \frac{{{\rm{[}}F{\rm{]}}}}{{{\rm{[}}I{\rm{]}}\,{\rm{[}}L{\rm{]}}}} = \frac{{[ML{T^{ - 2}}]}}{{[I]\,[L]}}$=$[M{T^{ - 2}}{I^{ - 1}}]$
$[P] = \frac{{{B^2}{l^2}}}{m} = \frac{{{{[M{T^{ - 2}}{I^{ - 1}}]}^2} \times [{L^2}]}}{{[M]}}$ $ = [M{L^2}{T^{ - 4}}{I^{ - 2}}]$