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
$\sqrt 2 qa$ along the line joining points (x = 0, y = 0, z = 0) and (x = $a$, y = a, z = 0)
q$a$ along the line joining points (x = 0, y = 0, z = 0) and (x = $a$, y = a, z = 0)
$\sqrt 2 qa$ along +x direction
$\sqrt 2 qa$ along +y direction.
Solution
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