An electromagnetic device comprises a magnetic field generating electrical
circuit including a winding (1) having at least one electrical conductor
(2). The winding comprises a solid insulation (4) surrounded by outer and
inner layers (3, 5) serving for equalization of potential and having
semiconducting properties. Said at least one electrical conductor (2) is
arranged interiorly of the inner semiconducting layer (3). The invention
also relates to methods for electric field control and production of a
magnetic circuit as well as use of a cable for obtaining a winding.
