(n) an arrangement of coils used in sensitive electrical instruments; the coils are arranged to give zero resultant external magnetic field when a current passes through them and to have zero electromotive force induced in them by an external magnetic field
[盘 / 盤, pánㄆㄢˊ] dish; tray; to build; to check; to examine; to transfer; classifier for food: dish, helping; to coil; classifier for coils of wire; tectonic plate#579