Magnetoquasistatic response of a distribution of small conducting and permeable objects

The authors study the magnetoquasistatic response of a collection of small conducting and permeable objects. In the formulation each individual object is characterized by its complex magnetic polarizability tensor which gives the dipolar response to a locally uniform exciting magnetic field including diffusion effects. Taking mutual interactions into account, a linear system of equations is solved for the vector dipole moments induced in the objects. Thus the total electromagnetic induction (EMI) response of the collection of objects is obtained, and the significance of mutual interaction and the influence of spatial distribution and varying parameters of the objects can be studied