Two point charges –q and +q are placed at a distance of L, as shown in the figure.The magnitude of electric field intensity at a distance R (R>>L) varies as :

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Two point charges –q and +q are placed at a distance of L, as shown in the figure.

The magnitude of electric field intensity at a distance R (R>>L) varies as :

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$\frac{1}{R^{6}}$

$\frac{1}{R^{3}}$

$\frac{1}{R^{4}}$

$\frac{1}{R^{2}}$

answer is A.

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Detailed Solution

$When R is much much greater than L it acts as a dipole and electric field on the axial line is \frac{K 2 p}{R^{3}} where p is the dipole moment = QL$

$E \propto \frac{1}{r^{3}}$

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