Fig. 12.15. The lead field current density distribution of a unipolar single-coil magnetometer with a 10 mm coil radius in a cylindrically symmetric volume conductor calculated from Equation 12.42. The dashed lines are the isosensitivity lines, joining the points where the lead field current density is 100, 200, 300, 400, and 500 pA/m², respectively, as indicated by the numbers in italics.