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Three point charges +q, -2q and +q are p...

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

A

`sqrt2`qa along +y direction

B

`sqrt2`qa along the line joining points
(x = 0, y = 0, z = 0)
and (x = a, y = a, z = 0)

C

qa along the line joining points
(x = 0, y = 0, z = 0)
and (x = a, y = a, z = 0)

D

`sqrt2`qa along +x direction

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The correct Answer is:
B
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