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

Options

A. `sqrt(2qa)` along + y -direction
B. `sqrt2qa` along the line joining points `(x = 0, y = 0, z = 0)` and `(x = a, y = a, z = 0)`
C. `qa` along the line joining point `(x = 0, y = 0, z = 0)` and `(x = a, y = a, z = 0)`
D. `sqrt2qa` along + x-direction

Answer

B