Q.
Derive an expression for the intensity of the electric field at a point on the axial line of an electric dipole.
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answer is 1.
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Detailed Solution
Consider an electric dipole consisting charges –q and q, seperated by a distance 2a. Let p be a point on the axial line of a dipole at a distance r from centre of dipole as shown in figure
Electric field due to charge –q at P is
Electric field due to charge +q at P is
Resultant electric field at point P is
if a<<<r then 'a' is negligible
The direction of is in the direction of dipole moment
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