Three point charges +q, –2q 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:-

Question

( A ) $\sqrt{2}$ qa along the line joining points
( x=0, y=0, z=0) and (x =a, y=a, z=0)
( B ) qa along the line joining points
( x=0, y=0, z=0) and (x =a, y=a, z=0)
( C ) $\sqrt{2}$ qa along + x direction
( D ) $\sqrt{2}$ qa along + y direction