A charge +10 μC is placed at (0 mm, 0 mm) Another charge –5 μC is moved from (3 mm, 0 mm) to (0 mm, 3 mm). Work done by the external agency is

0 J -150 J +150 J -300 J

0 J

Here, A and B are equidistant from Origin ,OA = OB ∴ VA = VB Than ΔV = VA – VB = 0 Hence, W = q(Δv) = 0