Two opposite and equal charges 4 x 10-8 coulomb when placed 2 x 10-2 cm away, form a dipole. If this dipole is placed in an external electric field 4 x 108 newton/ coulomb, the value of maximum torque and the work done in rotating it through 180 ° will be

Dipole moment p = $4 \times 10^{- 8} \times 2 \times 10^{- 4} = 8 \times 10^{- 12} m$

Maximum torque = $pE = 8 \times 10^{- 12} \times 4 \times 10^{8} = 32 \times 10^{- 4} Nm$

Work done in rotating through 180 ° = 2pE $= 2 \times 32 \times 10^{- 4} = 64 \times 10^{- 4} J$

Two opposite and equal charges 4 x 10^-8 coulomb when placed 2 x 10^-2 cm away, form a dipole. If this dipole is placed in an external electric field 4 x 10⁸ newton/ coulomb, the value of maximum torque and the work done in rotating it through 180 ° will be