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An electric dipole of dipole moment p is aligned parallel to a uniform electric field E. The energy required to rotate the dipole by 90⁰ is
Options
(a) p E²
(b) p² E
(c) p E
(d) infinity
Correct Answer:
p E
Explanation:
When electric dipole is aligned parallel θ = 0⁰ and the dipole is rotated by 90⁰ i.e., θ = 90⁰
Energy required to rotate the dipole W = Uⱼ – Uᵢ = (- pE cos 90⁰) – ( – pE cos 0⁰) = p E
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Topics: Electrostatics
(146)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Imagine a new planet having the same density as that of earth but it is 3 times bigger
- Find the fundamental frequency of a closed pipe if the length of air column is 42m.
- A wire is suspended vertically from one of its ends is stretched by attaching a weight
- If in a nuclear fusion process, the masses of the fusing nuclei be m₁ and m₂
- In an LCR series A.C circuit, the voltage across each of the components, L, C and R is 50V
Topics: Electrostatics (146)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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