An electric dipole of moment is placed in an electric field of intensity

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

An electric dipole of moment pp is placed in an electric field of intensity EE. The dipole acquires a position such that the axis of the dipole makes an angle θ\theta with the direction of the field. Assuming that the potential energy of the dipole to be zero when θ=90∘\theta = 90^\circ, the torque and the potential energy of the dipole will respectively be: (2012 Pre) (a) pEsin⁡θ,−pEcos⁡θpE\sin\theta, -pE\cos\theta (b) pEsin⁡θ,−2pEcos⁡θpE\sin\theta, -2pE\cos\theta (c) pEsin⁡θ,2pEcos⁡θpE\sin\theta, 2pE\cos\theta (d) pEcos⁡θ,−pEcos⁡θpE\cos\theta, -pE\cos\theta

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