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Electrostatics question

2012 · Q171
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Electrostatics question

2012 · Q171

NEETPhysicsElectrostaticsMCQ+4 / −1
An electric dipole of moment p is placed in an electric field of intensity E. The dipole acquires a position such that the axis of the dipole makes an angle θ\thetaθ with the direction of the field. Assuming that the potential energy of the dipole to be zero when θ\thetaθ = 90o, the torque and the potential energy of the dipole will respectively be
  1. A
    pEsinθ\thetaθ,  −-−pEcosθ\thetaθ
  2. B
    pEsinθ\thetaθ,  −-−2pEcosθ\thetaθ
  3. C
    pEsinθ\thetaθ, 2pEcosθ\thetaθ
  4. D
    pEcosθ\thetaθ,  −-−pEsinθ\thetaθ
View written solutionFree

Correct answer: A

Torque, τ\tau τ = pEsinθ\theta θ

Potential energy, U = –pEcosθ\theta θ

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