Hi, I'm very lost in this problem, anyone can help me? The problem is this: In steady state the magnetic field H satisifes the Maxwell equation delxH=J , where J is the current density (per square meter). At the boundary between two media there is a surface current density K (perimeter). Show that a boundary contidion on H is nx(H2-H1)=K. n is a unit vector normal to the surface and out of medium 1. Hint: consider a narrow loop perpendicular to the interface as shown in the figure. (The figure is attached). Note: del x H is the curl of H. Any ideas? Thank you.