In a linear positioning device, distances along a straight conducting bar are measured from one end. A uniform magnetic field covers the bar from the 6.0 cm mark to the 15.0 cm mark. The bar is perpendicular to the field and carries a current of 1.6 A. The magnetic flux density is 0.25 T0.25\ \mathrm{T}0.25 T. Use F=BIlF=BIlF=BIl. What is the magnetic force on the part of the bar in the field?
0.024 N0.024\ \mathrm{N}0.024 N
0.060 N0.060\ \mathrm{N}0.060 N
0.036 N0.036\ \mathrm{N}0.036 N
0.084 N0.084\ \mathrm{N}0.084 N