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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 with the direction of the field. Assuming that the potential energy of the dipole to be zero when = 90°, the torque and the potential energy of the dipole will respectively be :
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- p E sin θ, – p E cos θ
- p E sin θ, –2 p E cos θ
- p E sin θ, 2 p E cos θ
- p E cos θ, – p E cos θ
Correct Option: A
The torque on the dipole is given as
τ = pE sin θ
The potential energy of the dipole in the electric field is given as
U = – pE cos θ
