PYQ NEET- Electric Charges And Fields L-4

Question: The electric field at a point on the equatorial plane at a distance $r$ from the centre of a dipole having dipole moment $\overrightarrow{\mathrm{P}}$ is given by ( $r»$ separation of two charges forming the dipole, $\varepsilon_0=$ permittivity of free space)#

A) $E=\frac{P}{4 \pi \varepsilon_0 r^3}$

B) $\mathrm{E}=\frac{2 P}{4 \pi \varepsilon_0 r^3}$

C) $E=-\frac{P}{4 \pi \varepsilon_0 r^2}$

D) $E=-\frac{P}{4 \pi \varepsilon_0 r^3}$

Answer: $E=\frac{P}{4 \pi \varepsilon_0 r^3}$#

Sol:#

Electric field due to electric dipole on equatorial plane at a distance $r$ from the centre of dipole is given as

$$ E=\frac{1}{4 \pi \varepsilon_0} \cdot \frac{p}{r^3} $$