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Two opposite and equal charges $4 \times {10^{ - 8}}\,coulomb$ when placed $2 \times {10^{ - 2}}\,cm$ away, form a dipole. If this dipole is placed in an external electric field $4 \times {10^8}\,newton/coulomb$, the value of maximum torque and the work done in rotating it through $180^\circ $ 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 $32 \times {10^{ - 4}}\,J$
  • D$32 \times {10^{ - 4}}\,Nm$ and $64 \times {10^{ - 4}}\,J$
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