Three point charges 2q, -q and -q are located at (0, a, a), (0, a, -a) and (0, 0, -a), respectively, as shown. The dipole moment of this distribution is:

Options

• Option A

  2qa in the y-z plane at tan⁻¹(1/4) with the z-axis

• Option B

  √17 qa in the y-z plane at tan⁻¹(1/4) with the z-axis

• Option C

  √5 qa in the x-y plane at tan⁻¹(4) with the y-axis

• Option D

  4qa in the x-y plane at tan⁻¹(4) with the y-axis