Answer :

Electric field due to charge q at distance r is given by … (i)


Now, the potential due to this charge is given by


… (ii)


Therefore, potential energy of a charge q’ in this potential is given by … (iii)


In the given problem, q = 7μC = 7 x 10-6 C


q’ = -2μC = -2 x 10-6 C



Therefore, potential energy of the system



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