Question

Mention two differences between potential due to a point

charge and potential due to an electric dipole. Also derive an

expression for the electric potential at a point on the extended

axis of an electric dipole.​

Answer 1

Answer:

Derive an expression for electric potential at any point due to an electric dipole. Potential at point P due to the dipole along the equatorial line will be zero as P is equidistant from the two charges.

Explanation:

Electrostatic potential at a point due to an electric dipole

Consider two equal and opposite charges separated by a small distance 2a as shown in Figure 1.26. ...

Potential at P due to charge +q =

Potential at P due to charge –q=

Total potential at the point P,

By the cosine law for triangle BOP,

Since the point P is very far from dipole, then r>>a.