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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
- In Moseley’s law √ν=a(z-b), the values of the screening constant for K-series
- A electric dipole is placed at an angle of 30⁰ to a non-uniform electric field.
- Two wires of the same dimensions but resistivities p1 and p2 are connected in series
- 24 cells of emf 1.5 V each having internal resistance of 1 ohm are connected
- A particle of mass 1mg has the same wavelength as an electron moving with a velocity
Topics: Electrostatics (146)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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