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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