An infinitely long wire lies all along the z-axis and carries a current of around 30 A in the positive z direction. The second infinitely long wire is parallel to the z axis, and intercepts the x-axis at x = 8.6 cm.
(i) Determine the current in the second wire when the magnetic field at x = 1.5 cm is zero.
(ii) Determine the magnetic field at x = 5.0 cm?