ferrous shield

A low-resistance electric-current conducting material that contains iron and therefore (a) prevents electric fields from being sustained, (b) provides a low-reluctance, high-magnetic-permeability path that conducts magnetic flux away from the shielded object, (c) causes incident electromagnetic waves to be absorbed or reflected, and (d) prevents electromagnetic waves from penetrating deeply and therefore prevents their transmission through the material. See also absorption, electromagnetic wave, electric current, electric field, incident, magnetic field, magnetic flux, magnetic permeability, magnetic reluctance, object, reflection, resistance, shield, shielding, transmission.