Question

Derive an expression for electric potential due to an electric dipole.

Answer 1

Derive an expression for potential due to an electric dipole at a point (r,

Derive an expression for potential due to an electric dipole at a point (r, theta) what will be the expression for the potential for special cases ,when the point lies a)on the axial line but on the side of positive charge b)on the axial line but on the side of negative charge c)on the equatorial line of dipole?

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Answer 2

The NCERT formula is correct if used with vector notation as the direction of electric dipole moment is from -q(negative charge) to +q(positive charge) and the resultant electric field at any point on equatorial line is in direction opposite to the electric dipole moment so negative sign is used. The other formula which does not include negative sign is applicable to calculate the magnitude(not direction) of electric field.