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Q.

A point Q lies on the perpendicular bisector of an electrical dipole of dipole moment p. If the distance of point Q from the dipole is r (much larger than the size of the dipole), then the electric field at Q is proportional to

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a

p^–1 and r^–2

b

p and r^–2

c

p² and r^–3

d

p and r^–3

answer is D.

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Detailed Solution

$E = \frac{p}{4 {πε}_{o} \cdot r^{3}}$

Apparently, $E \propto p$ and $E \propto \frac{1}{r^{3}} \propto r^{- 3}$

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A point Q lies on the perpendicular bisector of an electrical dipole of dipole moment p. If the distance of point Q from the dipole is r (much larger than the size of the dipole), then the electric field at Q is proportional to