Aspects of the present invention relate to a device and method for examining and using an electrical field in a magnetic gradient field, containing magnetic particles in an examination area of an object under examination, including introducing magnetic particles into at least part of the examination area of the object under examination； generating an electrical field at least in part of the examination area； generating a magnetic field having a spatial magnetic field strength profile with a first sub-zone with a low magnetic field strength and a second sub-zone with a higher magnetic field strength in the examination area； varying a spatial position of the two sub-zones in the examination area such that a magnetization of the particles changes locally； detecting signals which depend on the magnetization in the examination area influenced by this variation； evaluating the signals to obtain information about the spatial distribution of the magnetic particles in the examination area； and determining a conductivity in the examination area as a function of a magnetization status of the magnetic particles.
