CBSE Class 12-science Answered
Compare and define INVERSE SQUARE LAW AND INVERRSE CUBE LAW IN RELATION TO CHARGE AND ELECTRIC DIPOLE
Asked by pkguru | 08 Jul, 2011, 05:29: AM
Expert Answer
Inverse square law is any physical law according to which a specified physical quantity is inversely proportional to the square of the distance from the source of that quantity.
Similarly, if the physical quantity is inversely proportional to the cube of the distance from its source, then it is said to obey inverse cube law.
We know that the electric field intensity due to a single point charge(q) at a distance 'r' from it is given as
Therefore, it obeys inverse square law.
And the electric field intensity of an electric dipole (of dipole moment 
) on its axial line at a distance 'r' from its centre is given as
) on its axial line at a distance 'r' from its centre is given as
Therefore, it obeys inverse cube law.
Answered by | 08 Jul, 2011, 01:41: AM
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