14.5 The Magnetic Field Intensity h We know that for non -magnetic material V×B=1(0Jf, where Jf is the free current density Now if we have a magnetized material as well as a free current density Jf, then V×B=0(Jr+Je) where both the free, and the equivalent currents con tribute This equation holds only at points where the deriva tives v x B exist. no at the boundary