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# A point charge q move from point P to point S along the path PQRS (as shown in the figure) in presence of an uniform electric field . The co-ordinates of the points are $P(−a, b, 0), Q(2a, 0, 0), R (a, −b, 0),$ and $S (0, 0, 0)$, respectively.The work done is

$(D)\;qE \sqrt {(a^2+b^2)}$