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Q37. A point charge q moves from point A to point D along the path ABCD (as shown) in a uniform electric field E pointing parallel to negative direction of X-axis. The co-ordinates of A, B, C, D are (0,0,0), (a, b, 0), (3a,0,0) and (2a,-b, 0) respectively. The work done by the field in the above process is given by expression: (a) qEa (b) √2qEa (c) -qEa (d) -2aqE