E xample A very long, hollowH23 conductor of inner radius a and outer radius b located along the z axis and carries a current l in the z direction, as depicted in figure. if the current distribution is uniform#je, determine the magnetic flux density磁通密度 at any point in space 71Example A very long, hollow中空 conductor of inner radius a and outer radius b is located along the z axis and carries a current I in the z direction, as depicted in figure. if the current distribution is uniform均匀, determine the magnetic flux density磁通密度at any point in space. b a y x 