Small oscillations of an electric dipole in the presence of a uniform   magnetic field
  In this letter we study the classical motion of an electric dipole in the presence of a uniform magnetic field in the approximation of small oscillations. The normal modes of oscillations are obtained and propose a criterion of applicability of the method of small oscillations. In our opinion, the resolution of such examples is useful for training students in science and engineering. 
Luis Alberto del Pino
physics.class-ph