Electric field of an electric dipole at a point in space depends upon the position of the point.
- The dipole field at a point is inversely proportional to the cube of distance from the center to the point.
- For a very small dipole, the 2a approaches zero. This is called point dipole.
Example:
To calculate electric field at mid point of line joining two charges 3 & -3 μC, which are 20 cm apart, we can use the formla for electric field of a dipole on an axis.
