Q 1.10) An electric dipole with dipole moment is aligned at 30° with the direction of a uniform electric field of magnitude . Calculate the magnitude of the torque acting on the dipole.
Electric dipole moment, Angle made by p with a uniform electric field, θ = 30°Electric field, E=5×104NC−1Torque acting on the dipole is given by the relation, τ=pEsinθ=4×10−9×5×104×sin30=20×10−5×12=10−4Nm
Therefore, the magnitude of the torque acting on the dipole is 10-4 Nm.