Two equal and opposite charges $8 \times 10^{-8} C$ are placed $2 \times 10^{-2}$ cm away from a dipole . If this dipole is placed in an external electric field $2 \times 10^8 N/C$. the value of maximum torque and work done in rotating through $180^{\circ}$ will be :

Question

$(A)\;64 \times 10^{-4} Nm \;and\; 64 \times 10^4 J \\ (B)\;32 \times 10^{-4} Nm \;and\; 32 \times 10^{-4} J \\ (C)\;64 \times 10^{-4} Nm \;and\; 32 \times 10^{-4} J \\ (D)\;32 \times 10^{-4} Nm \;and\; 64 \times 10^{-4} J$