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NEET 2022 (Phase 1) · Electric Dipole

Electric Dipole question from NEET 2022 (Phase 1)

Q49NEET 2022 · PHASE 1Easy

Electric Dipole

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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Answer: (b)

For $R \gg L$ the pair is a short dipole of moment $p = qL$ .
Dipole field at any direction: $E = \frac{kp}{R^3}\sqrt{1 + 3\cos^2\theta}$
So $E \propto \frac{1}{R^3}$ , answer (b).

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