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4. The electric dipole moment is a measure of the separation of positive and negative electrical charges with in a system that is a measure of the system overall polarity. the SI unit of electric dipole moment are coulomb meter ( C )

5. (a) electric field due to an electric dipole at a point on its axial line : AB is an electric dipole of two point charge -q +q separated by small distance 2d. p is a point along the axial line of the dipole at a distance r from the midpoint O of the electric dipole.

( b ) Drive an expression for intensity of electric field at a point broadside position or an equatorial line of an electric dipole . The direction of electric field E is ' antiparallel' to the dipole axis .