Question

(a) Derive an expression for the electric field E due to a dipole of length '2a' at a point distant r from the centre of the dipole on the axial line.

(b) Draw a graph of E versus r for r >> a.

(c) If this dipole were kept in a uniform external electric field E₀, diagrammatically represent the position of the dipole in stable and unstable equilibrium and write the expressions for the torque acting on the dipole in both the cases.

Answer 1

(a) Consider an electric dipole whose length is 2a and center at O. From the mid-point O, consider a point at the distance r, where the electric field intensity is to be determined.

Comments

Thank you

---

Thanks a lot!