Three point charges +q, -q and +q are placed at points (x = 0, y = a, z = 0) , (x = 0, y = 0, z = 0) and (x = a, y = 0, z = 0) respectively. The magnitude and direction of the electric dipole moment vector of this charge assembly are

1. A. 2 qa along the line joining points (x = 0, y = 0, z = 0) and (x = a, y = a, z = 0)
2. B. qa along the line joining points (x = 0, y = 0, z = 0) and (x = a, y = a, z = 0)
3. C. 2 qa along +ve x direction
4. D. 2 qa along +ve y direction

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