current I flows long straight wire of radius a, has susceptibility Xm magnetic field in the conductor B = mui0 ( 1 + Xm) H by amphere\'s law integral H .dl = If enclosed = I x pi r2/ pi a2 H . 2pi r = I r2/a2 H = I r/ 2pi a2phi B = mui0 ( 1 + Xm ) Ir/ 2pi a2 phi bound currents, Jb and Kb volume current density, Jb = del x M = del x Xm H = Xm del x H = Xm Jf z Jb = Xm I/pi a2 z surface current, Kb = M x n = Xm H phi x r Kb = Xm I/ 2pi a z Solution current I flows long straight wire of radius a, has susceptibility Xm magnetic field in the conductor B = mui0 ( 1 + Xm) H by amphere\'s law integral H .dl = If enclosed = I x pi r2/ pi a2 H . 2pi r = I r2/a2 H = I r/ 2pi a2phi B = mui0 ( 1 + Xm ) Ir/ 2pi a2 phi bound currents, Jb and Kb volume current density, Jb = del x M = del x Xm H = Xm del x H = Xm Jf z Jb = Xm I/pi a2 z surface current, Kb = M x n = Xm H phi x r Kb = Xm I/ 2pi a z.