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Two opposite and equal charges $4 ×10^{-8}$ coulomb when placed $2\times 10^{-2}$ cm away, form a dipole. If this dipole is placed in an external electric field $4 ×10^{8}$ newton/coulomb, the value of maximum torque and the work done in rotating it through 180° will be

• 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 $32 \times 10^{-4}J$
• ✓
  $32 \times 10^{-4}Nm $ and $ 64 \times 10^{-4}J$