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Electrostatics question

2016 · Q131
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Electrostatics question

2016 · Q131

NEETPhysicsElectrostaticsMCQ+4 / −1
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
  1. A
    8 mC
  2. B
    2 mC
  3. C
    5 mC
  4. D
    7 μ\muμC
View written solutionFree

Correct answer: B

Torque is given by τ = pE sin θ

τ = pE sin θ = qlllE sinθ

⇒\Rightarrow⇒ q = τ /lllE sinθ

= 4/(2 × 10-2 × 0.5 × 2 × 105) = 2 mC

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