An electric dipole is placed at an angle of 30 ° with an electric field intensity 2 × 10 5 N C - 1 . It experiences a torque equal to 4 N m . The charge on the dipole, if the dipole length is 2 cm , is

Step-by-step solution

Torque on the dipole in uniform electric field is given as τ = P E sin ⁡ θ ⇒ τ = q l E sin ⁡ θ ⇒ q = τ l E sin ⁡ θ = 4 2 × 10 - 2 × 0.5 × 2 × 10 5 = 2 × 10 - 3   C Hence, charge on dipole is 2   mC .