In a conductor of length l and area of cross section A, if vd is the drift velocity of the charge carriers of charge q having a number density of n, then what is lABnqvd if B is the magnetic field  ?

Magnetic Moment Force Momentum Electric field.

Force

lABnqvd  lA = Volume(V) nqV = Total Charge(Q) $\Rightarrow lABnqv_d = Qv_dB = \text{ Magnetic Force}$