Q 1.10) An electric dipole with dipole moment is aligned at 30° with the direction of a uniform electric field of magnitude 5×104NC1. Calculate the magnitude of the torque acting on the dipole.

 
Electric dipole moment, p=4×109CmAngle made by p with a uniform electric field, θ 30°Electric field, E=5×104NC1Torque acting on the dipole is given by the relation, τ=pEsinθ=4×109×5×104×sin30=20×105×12=104Nm
Therefore, the magnitude of the torque acting on the dipole is 10-4 Nm.