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Two point charges −4μC and 4μC , constituting an electric dipole, are placed at (− 9, 0, 0) cm and (9, 0, 0) cm in a uniform electric field of strength 104 NC−1 . The work done on the dipole in rotating it from the equilibrium through 180° is :

A
12.4 mJ
B
16.4 mJ
C
14.4 mJ
D
18.4 mJ
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