Question
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 =90o, the torque and the potential energy of the dipole will respectively be
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pE sin θ, pE cos θ
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pE sin θ,-2pE cos θ
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pE sin θ, 2 pE cos θ
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pE cos θ,-pE sin θ
Solution
A.
pE sin θ, pE cos θ
Here
Torque =pE sin θ
