(28-27) A 2.5-mm-diameter copper wire carries a 33-A current (uniform across its cross section). Det

(28-27) A 2.5-mm-diameter copper wire carries a 33-A current (uniform across its cross section). Determine the magnetic field: (a) at the surface of the wire; (b) inside the wire, 0.50 mm below the surface; (c) outside the wire 2.5 mm from the surface.