An electric dipole having point charges \(+q\) and \(-q\), separated by a fixed distance \(d\) is kept under the influence of a uniform electric field \(\mathrm{E}\), such that the axis of the dipole is making an angle \(\theta=45^{\circ}\) with the direction of \(\mathrm{E}\), as shown in the figure. If the electric dipole is allowed to rotate in the \(x y\)-plane with its center being stationary, what is the magnitude of the net torque acting on the electric dipole?

• A

  \(q d E\)
• Correct answer
  B

  \(q d E / \sqrt{2}\)
• C

  \(\sqrt{2} /(q d E)\)
• D

  \(\sqrt{2} q d E\)

Hence, the correct answer is option: 'B'.