Two charges each of magnitude $0.01\,C$ and separated by a distance of $0.4\,mm$ constitute an electric dipole. If the dipole is placed in a uniform electric field $\vec{E}$ of $10\,dyne/C$ making a $30^{\circ}$ angle with $\vec{E}$,the magnitude of torque acting on the dipole is:
- A$4.0 \times 10^{-10}\,Nm$
- B$2.0 \times 10^{-10}\,Nm$
- C$1.0 \times 10^{-8}\,Nm$
- D$1.5 \times 10^{-9}\,Nm$
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