Three infinite planes current sheets, each of a uniform current density, exist in the coordinate planes of a Cartesian coordinate system. The magnetic flux density due to these current sheets are given at three points as follows: at (1,5,3), = 0( + 2), at (6, -1,2), = 0(− + 2 + ) , at (1,2,-2), = 0( + 2) . Let the current densities on the , , on the x=0,y=0 and z=0 planes, respectively. Find the magnetic flux density at the following points: a/ (-1,1,4) b/ (-1,-2,-4) Really need help with this one, I have no idea where to start. I'm confident with vectors, though, but what about this problem? I've only read how to deal with one plane of current sheet.