Current jetting and current channelling are discussed as representative models of magnetoresistance due to inhomogeneities. Induced torque experiments on the linear magnetoresistance of potassium show that its orientational dependance has uniaxial symmetry; and that the axis of symmetry is determined by the direction of growth of the single crystal. These, and a variety of other contactless measurements are consistent with a boundary‐conditions model for the current flow around non‐spherical inhomogeneities.