Expression for electric field intensity at a point:
Electric field intensity due to a point charge:
Electric field intensity at any point due to a group of point charges:
Electric field intensity at any point due to a group of point charges is equal to the vector sum of electric field intensities due to individual charges at the same point.
Electric Dipole:
An electric dipole consists of a pair of equal and opposite point charges separated by some small distance.
Dipole Moment:
It is a measure of the strength of electric dipole. The magnitude of dipole moment is given by product of either charge and the distance between them.
It is a vector quantity whose direction is from negative to positive charge.
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