JEE Main 2026 · 2 Apr · Shift 1 · Physics Q36

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Two short electric dipoles $A$ and $B$ having dipole moment $p_1$ and $p_2$ respectively are placed with their axis mutually perpendicular as shown in the figure. The resultant electric field at a point $x$ is making an angle of 60° with the line joining points O and $x$ . The ratio of the dipole moments $p_2/p_1$ is ________.

Two short dipoles centred at O: dipole A lies along the horizontal line (+ on the left, − on the right) and dipole B is vertical (+ above, − below). Point x lies on the horizontal line to the right of O, joined to O by a dashed line, so x is on the axis of A and on the equatorial line of B.

\dfrac{\sqrt3}2

2\sqrt3

\dfrac1{\sqrt3}

\sqrt3

Answer and worked solution

Official answer: B

Position of x. It lies on the axis of dipole A and on the equatorial line of dipole B.

Fields. $E_A=\dfrac{2kp_1}{r^3}$ along Ox and $E_B=\dfrac{kp_2}{r^3}$ perpendicular to it.

Angle. $\tan60^\circ=\dfrac{E_B}{E_A}=\dfrac{p_2}{2p_1}$ , so $\dfrac{p_2}{p_1}=2\sqrt3$ .

(B)

Topics:Electric dipole

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JEE Main 2026 · 2 Apr · Shift 1, Physics question 36