The point charges `+ q, -2q` and `+ q` are placed at point `(x = 0, y = a, z = 0), (x = 0, y = 0, z = 0)` and `(x = a, y = 0, z = 0)`, repectively. The magnitude and direction of the electric dipole moment vector of this charge assembly are

Options

A. `sqrt(2) q a` along the line joining points (x = 0, y = 0, z = 0) and (x = a, y = a, z = a)
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 + ve x direction
D. `sqrt(2) qa` along + ve y direction

Answer

A