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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
Related Questions: - Two metallic spheres of radii 1 cm and 3 cm are given charges of -1 x 10⁻² C
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Topics: Electrostatics
(146)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Two metallic spheres of radii 1 cm and 3 cm are given charges of -1 x 10⁻² C
- A transformer having efficiency of 90% is working on 200 V and 3kW power supply
- Which of the following measurement is most precise?
- The oscillation of a body on a smooth horizontal surface is represented by the equation
- A wire of length 1 m is moving at a speed of 2 ms⁻¹ perpendicular to its length
Topics: Electrostatics (146)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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