Force on charges = Bqv. It is quite obvious that charges are tiny dots (point charge) .
Force on current = BIL . The wire is straight. The two formulas are the same as I=Q/t , then L/t is v.
Force on charge, F= qE.
If E=V/d (uniform) or E=kQ/r2 (point charge),
the force F=qV/or F= kqQ/r2
Force on mass F = mg.
If g = go (uniform = 9.81ms-2 ) or g=GM/r2(point mass) ,
the force F = mgo or F = GmM/r2
