In the class on Feb 24, I worked out the magnetic field on the bisecting plane of a straight wire of length 2L carrying a current I. Apply the results of that problem directly to determine the magnetic field H on the axis of a square loop of side 2L carrying a constant current I. [Hints: Can you express the unit vector ϕ^​of class notes in terms of the direction of current flow and the direction of position vector of observation point? Identify what distance r in the notes corresponds to. Use superposition at the end.] (40 points) of in the xy-plane reld at (0,0,z) ? Figure1: Square loop of side 2L carrying a current I