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Torque on a dipole of moment p placed in a uniform field E at angle θ is:
Ap E sinθ
Bp E cosθ
Cp E
Dp / E
Answer & Solution
Correct answer: A. p E sinθ
1. τ = p × E = p E sinθ in magnitude, with direction by right-hand rule.
2. Torque vanishes at θ = 0 (stable equilibrium) and θ = 180° (unstable).
3. Net force on a dipole in a UNIFORM field is zero; only torque acts.
_Source: NCERT Class 12 Physics Ch 1 §1.9 Dipole in Uniform Field_
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