An electric dipole is formed by two
equal and opposite charge q with
separation d, the charges have same
mass m. It is kept in a uniform
electric field E. If it is slightly
rotated from its equilibrium
orientation, then its angular
frequency w is
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we know T = PEsin©
now T = PE© for samll angle
now I@ = PE© hence
@ = PE©/I similar to w²©
hence w = square root of pe/I
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