(21-65) An electric dipole, of dipole moment p and moment of inertia I, is placed in a uniform elect

(21-65) An electric dipole, of dipole moment p and moment of inertia I, is placed in a uniform electric field E. (a) If displaced by an angle θ as shown in Fig. 21-44 and released, under what conditions will it oscillate in simple harmonic motion? (b) What will be its frequency?