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 \theta with the direction of the field. Assuming that the potential energy of the dipole to be zero when \theta=90^{\circ}, the torque and the potential energy of the dipole will respectively be :

Correct Answer is : pEsinθ,−pEcosθ

{\p} E \sin \theta,- {\p} E \cos \theta

p E \sin \theta,-2 p E \cos \theta

p E \sin \theta, 2 p E \cos \theta

p E \cos \theta,-p E \cos \theta

AIPMT 2012 Physics and Chemistry Paper

Question : 6 of 100

Marks: +1, -0

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 θ=90∘, the torque and the potential energy of the dipole will respectively be :

pE‌sin‌θ,−pE‌cos‌θ
pE‌sin‌θ,−2pE‌cos‌θ
pE‌sin‌θ,2pE‌cos‌θ
pE‌cos‌θ,−pE‌cos‌θ

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