Whwn is the potential energy of electric dipole (i) maximum (ii) minimum in uniform electric field?

Potential energy of dipole is gievn by" U = -P.E = -PEcosθwhen angle between the dipole and field is zero degree then potential energy is minimumwhen angle between then is 180 degree then potential energy is maximum.

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Potential energy is maximum when dipole moment is anti parallel the the direction of EF  ( condition is called unstable equilibrium ) and minimum when dipole moment is parallel to the EF ( Stable Equilibrium ) . Hope that helps. 
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