An electric dipole with dipole moment $4 \times 10^{-9} \;C \,m$ is aligned at $30^{\circ}$ with the direction of a uniform electric field of magnitude $5 \times 10^{4} \;N\,C ^{-1}$. Calculate the magnitude of the torque acting on the dipole.
- A$10^{-5} \;N \,m$
- B$10^{-2} \;N \,m$
- C$10^{-4} \;N \,m$
- D$10^{-3} \;N \,m$
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