Answer 1

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

`=4xx10^-9xx5xx10^4xxsin30`

`=20xx10^-5xx1/2`

`=10^-4 Nm`

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