derive the dimensional formula of magnetic flux with each steps clearly???

For a charge (q) moving with a speed v under the influence of a magnetic flux density of B, the force (F) exerted is given as

F = q (v x B)

or

B = F / qV

dimensionally

[B] = [MLT^-2] / [AT].[LT^-1]

so, [B] = [MT ^-2 A ^-1 ]