Polar forces

(Physics) forces that are developed and act in pairs, with opposite tendencies or properties in the two elements, as magnetism, electricity, etc.

See also: Polar

References in periodicals archive ?
How these two polar forces balance out will determine whether cheaper oil proves to be a Good or a Bad Thing.
Above all, this aesthetic imparts an almost-gnostic economy of polar forces of good and evil, at work behind the superficial world of appearances.