The Collaborative International Dictionary of English v.0.48:

magnetic force \magnetic force\ n.
   The force caused by a magnetic field, a force which affects
   objects having a magnetic field and objects in which a
   magnetic field can be induced, such as ferromagnetic
   substances; a magnetic force manifests itself as an
   attraction for iron. It is associated with electric currents
   and moving charged paticles as well as permanent magnets.

   Syn: magnetism, magnetic attraction.
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

magnetic force
    n 1: attraction for iron; associated with electric currents as
         well as magnets; characterized by fields of force [syn:
         magnetism, magnetic attraction, magnetic force]