JEE Main 2025 (7 Apr, Shift 2) Physics Q37: Electric Dipoles

Question

A dipole with two electric charges of

2\ \mu

C magnitude each, with separation distance

0.5\ \mu

m, is placed between the plates of a capacitor such that its axis is parallel to an electric field established between the plates when a potential difference of 5 V is applied. Separation between the plates is 0.5 mm. If the dipole is rotated by

30^\circ

from the axis, it tends to realign in the direction due to a torque. The value of torque is :

(1) $5\times10^{-3}$ Nm
(2) $5\times10^{-9}$ NmOfficial answer
(3) $2.5\times10^{-9}$ Nm
(4) $2.5\times10^{-12}$ Nm

Official answer

Option 2

NTA final key.

Accepted Answer

Option 2: $5	imes10^{-9}$ Nm

Answer

$5	imes10^{-3}$ Nm

Answer

$5	imes10^{-9}$ Nm

Answer

$2.5	imes10^{-9}$ Nm

Answer

$2.5	imes10^{-12}$ Nm

JEE Main 7 April 2025, Shift 2, Physics Q37

Same idea in other shifts