Question

An electric dipole with dipole moment 4 x 10-9

cm is aligned at 300 with

the direction of uniform electric field of magnitude 5 x 104N/C. Calculate

the magnitude of the torque acting on the dipole ?​

Answer 1

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Electric dipole moment, p = 4 × 10−9 C m

Angle made by p with a uniform electric field, θ = 30°

Electric field, E = 5 × 104 N C−1

Torque acting on the dipole is given by the relation, τ = pE sinθ

= 4×10^-9×5×10^4×sin30

= 20×10^-5×1/2

=10^-4 Nm

Therefore, the magnitude of the torque acting on the dipole is 10−4 N m.