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Expression of torque on an electric dipole placed in an uniform electric field | class 12 Physics


Consider, an electric dipole of length '2a' having charges '+q' and '-q' placed in an uniform electric field 'E'. The dipole moment 'p' is making an angle 'θ' with the electric field. There are two equal amount of electrostatic forces acting in opposite direction on the dipole which resulting zero net force but a torque 'τ' on the dipole.

As,
torque = force × perpendicular distance
         Ï„ = qE × 2aSinθ


For "potential energy of an electric dipole rotated in an uniform electric field"
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by     www.advguruji.blogspot.com
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