An electric dipole is formed by placing a charge of $4 \times 10^{-8} \ C$ at a distance of $2 \times 10^{-2} \ cm$. If it is placed in an electric field of $4 \times 10^8 \ N/C$,what is the maximum torque acting on it and the work done to rotate the dipole by $180^{\circ}$?

• 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 $64 \times 10^{-4} \ J$