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 $180^o$ will be
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 $180^o$ 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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