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

Question

Aicharya · Accepted Answer

Torque on the dipole in uniform electric field is given as

τ = P E \sin θ

\Rightarrow τ = q l E \sin θ

\Rightarrow q = \frac{τ}{l E \sin θ}

= \frac{4}{2 \times 10^{- 2} \times 0.5 \times 2 \times 10^{5}} = 2 \times 10^{- 3} C

An electric dipole is placed at an angle of 30 ° with an electric field intensity 2 × 10 5 N C - 1 . It…

Solution