An electric dipole is placed at an angle of 30o with an electric field intensity 2 × 105 N C ⁻¹. It experiences a torque equal to 4 N m. The charge on the dipole, if the dipole length is 2 cm, is (a) 8 mC (b) 2 mC (c) 5 mC (d) 7 μ C

Answer: (b). τ = q(2l)Esin θ 4 = q × 0.02 × 2×10⁵ × 1/2 = 2000 q q = 2×10⁻³ C = 2 mC So the answer is (b) 2 mC.

An electric dipole is placed at an angle of 30o with an electric… | NEET 2016 (Phase 2)

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Electric Dipole

An electric dipole is placed at an angle of 30o with an electric field intensity 2 $\times$ 105 N C ${}^{-1}$ . It experiences a torque equal to 4 N m. The charge on the dipole, if the dipole length is 2 cm, is

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Answer: (b)

$\tau = q(2l)E\sin\theta$
$4 = q \times 0.02 \times 2\times10^{5} \times \frac{1}{2} = 2000\,q$
$q = 2\times10^{-3}$ C $= 2$ mC
So the answer is (b) 2 mC.

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