An electric dipole with dipole moment 5 × 1 0 − 6 Cm is aligned with the direction of a uniform electric field of magnitude 4 × 1 0 5 N / C The dipole is then rotated through an angle of 6 0 ∘ with re

Question

An electric dipole with dipole moment 5 × 1 0 − 6 Cm is aligned with the direction of a uniform electric field of magnitude 4 × 1 0 5 N / C The dipole is then rotated through an angle of 6 0 ∘ with respect to the electric field. The change in the potential energy of the dipole is:NEET 2025

TestHub · Accepted Answer

Given, ​ p = 5 × 1 0 − 6 Cm E = 4 × 1 0 5 N / C θ i ​ = 0 ∘ , θ f ​ = 6 0 ∘ Δ U = U f ​ − U i ​ = − pE cos θ f ​ − ( − pE cos θ i ​ ) ⇒ pE ( cos θ i ​ − cos θ f ​ ) ⇒ 5 × 1 0 − 6 × 4 × 1 0 5 ( 1 − 2 1 ​ ) = 1 J ​

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