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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
- According to Bohr model of hydrogen atom, only those orbits are permissible
- Work done by an external agent in separating the parallel plate capacitor is
- A thin rod of length L and mass M is held vertically with one end on the floor
- A beam of cathode rays is subjected to crossed Electric (E) and Magnetic fields (B)
- A car of mass m starts from rest and accelerates so that the instantaneous
Topics: Electrostatics (146)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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