Two charges 5 μC and -2 μC (with no external field) are placed at (-9 cm, 0, 0) and (9 cm, 0, 0) respectively. The work required to separate the two charges infinitely away from each other is:

-0.5 J 0.5 J 5 J -5 J

0.5 J

The correct answer is Option (2) → 0.5 J