As per this diagram a point charge +q is placed at the origin O. Work done in taking another point charge -Q from the point A coordinates (0,a) to another point B coordinates (a,0) along the straight path AB is

1. A. ( -qQ 4 0 1 a 2 ) 2 a
2. B. zero
3. C. ( qQ 4 0 1 a 2 ) 1 2
4. D. ( qQ 4 0 1 a 2 ) 2 a

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