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Why electric field of dipole is inverse of cube of distance?

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Q. Statement I: The electric field due to a very small dipole at a large distance from its centre along its axis is

\frac{2 \to P}{4 π ε_{0} r^{3}} .

Statement II: Coulomb’s inverse square law is not valid in case of electric field due to a dipole.

Q. Assertion :On going away from a point charge or a small electric dipole, electric field decreases at the same rate in both the cases. Reason: Electric field is inversely proportional to square of distance from the charge or on electric dipole.

Q. The electric field due to a dipole at a distance r on its axis is

Q. Electric field of a dipole is related to distance

r

Q. The magnitude of the electric field at a distance

r

far away along the axis from an electric dipole is

E

. Find the magnitude of the electric field at distance

2 r

along the perpendicular bisector of the dipole.

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