Dimensional formula of magnetic induction (B) is 

• A

  ${\mathrm{MT}}^{-2}{\mathrm{A}}^{-1}$

• B

  ${\mathrm{MT}}^{-1}{\mathrm{A}}^{-2}$

• C

  ${\mathrm{M}}^{-1}{\mathrm{L}}^2{\mathrm{T}}^{-3}{\mathrm{A}}^{-2}$

• D

  ${\mathrm{M}}^{-2}{\mathrm{L}}^{-1}{\mathrm{T}}^{-2}{\mathrm{A}}^{-1}$