An electric dipole with dipole moment 5 10^ -6 Cm is aligned with the direction of a uniform electric field of magnitude 4 10^5 ~N / C The dipole is then rotated through an angle of 60^ with respect to the electric field. The change in the potential energy of the dipole is:

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Correct answer: B. 1.0 J

Given, aligned & p =5 10^ -6 Cm \ & E =4 10^5 ~N / C \ & _ i =0^ , _ f =60^ \ & U = U _ f - U _ i \ & =- pE _ f - (- pE _ i ) \ & pE ( _ i - _ f ) \ & 5 10^ -6 4 10^5 (1- 1 2 )=1 ~J aligned

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