#dipole_moment  the moment of a dipole
  supertype:  #moment.force  the moment of a couple is the product of its force and the distance between its opposing forces
  subtype:  #electric_dipole_moment  the dipole moment in an electric dipole
  subtype:  #magnetic_dipole_moment  (physics) a current loop gives rise to a magnetic field characteristic of a magnetic dipole; "An orbiting electron in an atom will have a magnetic dipole moment"

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