NEET 2025 Physics Potential Energy in Electric Fields MCQ Question
An electric dipole with dipole moment 5 × 10⁻⁶ Cm is aligned with the direction of a uniform electric field of magnitude 4 × 10⁵ N/C. The dipole is then rotated through an angle of 60° with respect to the electric field. The change in the potential energy of the dipole is:
0.8 J
1.0 J
1.2 J
1.5 J
Correct Answer
Detailed Explanation
The change in potential energy ΔU = pE(cosθ₁ - cosθ₂). Initially, θ₁ = 0° and finally θ₂ = 60°. ΔU = 5 × 10⁻⁶ × 4 × 10⁵ (1 - 0.5) = 0.8 J.
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