An infinitely long, thin conducting sheet of width w along the x-direction lies in the x–y plane and carries a current I in the _ y-direction. Determine
(a) The magnetic field at a point P midway between the edges of the sheet and at a height h above it (Fig. 5-42 (P5.17)), and then
(b) Determine the force per unit length exerted on an infinitely long wire passing through point P and parallel to the sheet if the current through the wire is equal in magnitude but opposite in direction to that carried by the sheet.