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:

1. A. 1.5 J
2. B. 0.8 J
3. C. 1.0 J
4. D. 1.2 J

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