Electrostatics

JEE Main level, single correct, medium

249 of 311

Question 249 of 311

The electric field due to a short electric dipole at a large distance (r)\left(r\right) from center of dipole on the equatorial plane varies with distance as :

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Answer: (C) 1r3\dfrac{1}{{r}^{3}}

An electric dipole is a system of two charges of equal and opposite magnitude placed at a short distance.
The dipole moment is, p=2qlp=2ql.
The electric field due to the dipole is,
E=2kpr3E=\dfrac{2kp}{{r}^{3}}
Clearly, the electric field varies as 1r3\dfrac{1}{{r}^{3}}.

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