An electric dipole is placed at an angle of $30^\circ$ with an electric field intensity of 2 $\times$ 105 N/C. It experiences a torque equal to 4 Nm. The charge on the dipole, if the dipole length is 2 cm, is ______.

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An electric dipole is placed at an angle of $30^\circ$ with an electric field intensity of 2 $\times$ 105 N/C. It experiences a torque equal to 4 Nm. The charge on the dipole, if the dipole length is 2 cm, is 2 mC. Explanation: We know, τ = pE.sin$\theta$ $\therefore$ p = tau/("E".sintheta) q $\times$ 2l = 4/(2 xx 10^5 xx 0.5) ............(∵ p = q $\times$ 2l) $\therefore$ q = 4/(2 xx 10^5 xx 0.5 xx 0.02) ....(∵ 2l = 0.02m given) = 2 $\times$ 10-3 C q = 2 mC

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