An electric dipole is placed at an angle of 30° with an electric. field intensity $2 \mathrm{x} {10}^5 \mathrm{N}/\mathrm{C}$. It experiences a torque equal to 4 Nm. The charge on the dipole, if the dipole length is 2 cm, is :

• A

  5 mC

• B

  7 μC

• C

  8 mC

• D

  2 mC