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Solution


Q.

A dipole P is released from rest from point O as shown in figure.

Then,
1 it will make SHM  
2 it will move linearly along +ve y-direction  
3 it will be in rotational and translational motion  
4 it will be stationary  

Ans.

(2)

E will be maximum at y=±a2                         U=-P→·E→ is min at this location.

So, y=+a2 is stable equilibrium                      

Since dipole was released from O so it will continue upto ∞ (conservation of energy).