Q. Point charge (q) moves from point (P) to point (S ) along the path PQRS as shown in fig. in a uniform electric field E, Pointing coparallel to the positive direction of the x-axis. The co-ordinates of the points P,Q,R,S are (a,b,0) , (2a,0,0) , (a,-b,0) , (0,0,0) respectively. The work done by the field in the above process is given by the expression
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