KCET2020PhysicsElectrostatics
A dipole moment p and moment of inertia I is placed in a uniform electric field E . If it is displaced slightly from its stable equilibrium position, the period of oscillation of dipole is
Options
- Ap E I
- B2 I p E
- C1 2 p E I
- DI p E
Correct answer
B. 2 I p E
Step-by-step solution
Torque on electric dipole placed in uniform electric field E , where, p= electric dipole moment. For small angle , = ...(i) From Eq. (i), we have =p E ...(ii) but =I ...(iii) where is angular acceleration. From Eqs. (ii) and (iii), we have I =p E = p E I = I p E ...(iv) Time period for the oscillation of dipole, T=2 =2 I p E