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An electric dipole of dipole moment p is alignedparallel to a uniform electric field E. The energyrequired to rotate the dipole by 90° is [NEET Kar. 2013]
- a)pE2
- b)p2E
- c)pE
- d)infinity
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
An electric dipole of dipole moment p is alignedparallel to a uniform ...
When electric dipole is aligned parallel
θ = 0° and the dipole is rotated by 90° i.e.,
θ = 90°.
Energy required to rotate the dipole
W = Uf – Ui = (–pE cos 90°) – (–pE cos 0°)
= pE.
θ = 0° and the dipole is rotated by 90° i.e.,
θ = 90°.
Energy required to rotate the dipole
W = Uf – Ui = (–pE cos 90°) – (–pE cos 0°)
= pE.
Most Upvoted Answer
An electric dipole of dipole moment p is alignedparallel to a uniform ...
Degrees from its initial position is given by:
U = pE(1 - cosθ)
where θ is the angle between the dipole moment and the electric field. When the dipole is initially aligned parallel to the electric field, θ = 0, and the energy is zero. When the dipole is rotated by 90 degrees, θ = 90 degrees, and the energy required is:
U = pE(1 - cos90) = 2pE
Therefore, the energy required to rotate the dipole by 90 degrees from its initial position is 2pE.
U = pE(1 - cosθ)
where θ is the angle between the dipole moment and the electric field. When the dipole is initially aligned parallel to the electric field, θ = 0, and the energy is zero. When the dipole is rotated by 90 degrees, θ = 90 degrees, and the energy required is:
U = pE(1 - cos90) = 2pE
Therefore, the energy required to rotate the dipole by 90 degrees from its initial position is 2pE.
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