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Electrostatics question

2022 · Q166
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Electrostatics question

2022 · Q166

NEETPhysicsElectrostaticsMCQ+4 / −1

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

NEET 2022 Phase 1 Physics - Electrostatics Question 15 English

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

  1. A
    1R2{1 \over {{R^2}}}R21​
  2. B
    1R3{1 \over {{R^3}}}R31​
  3. C
    1R4{1 \over {{R^4}}}R41​
  4. D
    1R6{1 \over {{R^6}}}R61​
View written solutionFree

Correct answer: B

For R >> L, arrangement is an electric dipole

$$E = {{2p} \over {4\pi {\varepsilon _0}{R^3}}}$$; where $p = qL$

$$E \propto {1 \over {{R_3}}}$$

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