Electric Charges and Fields - Result Question 25

25. If a dipole of dipole moment p is placed in a uniform electric field E, then torque acting on it is given by

[2001]

(a) τ=pE

(b) τ=p×E

(c) τ=p+E

(d) τ=pE

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Answer:

Correct Answer: 25. (b)

Solution:

  1. (b) Given : Dipole moment of the dipole =p and uniform electric field =E. We know that dipole moment (p)=qa (where q is the charge and a is dipole length). And when a dipole of dipole moment p is placed in a uniform electric field E, then Torque (τ)= Either force × Perpendicular distance between the two forces = qaEsinθ or τ=pEsinθ or τ=p×E (vector form)


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