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CBSE Class 12-science Answered

Define Electric dipole. Derive an expression for electric feild intensity at a point situated at a distance r from electric dipole
Asked by millionairekishan | 25 Jan, 2024, 12:34: PM
answered-by-expert Expert Answer

Two system charges, equal and opposite, are separated by a finite distance is called an electric dipole.

An equatorial line of a dipole is the line on a plane perpendicular to the dipole axis through its centre.

Consider a dipole consisting of -q and +q separated by a distance 2a. Let P be a point on the

equatorial line, as shown in figure.

electric dipole - electric field intensity at equatorial line

 

The magnitude of the electric field due to the two charges +q and –q are given by

The resultant electric field is the vector sum of the intensity due to charge +q and –q.

EA and EB can be resolved into vertical and horizontal component.

The components along dipole axis add up to give resultant field.

The vertical components of EA and EB cancel each other because they are equal and oppositely

directed. Therefore,

 

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