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Question
A dipole is placed in an electric field as shown. In which direction will it move ?
[NEET-
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2021]
[NEET- <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> 2021]
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Solution
Potential energy of electric dipole in external electric field,
U=−→P⋅→E=−PEcosθ
Angle between electric field and electric dipole is 180∘.
∴U=−PEcos180∘=+PE
On moving towards right, electric field strength decrease therefore potential energy decrease.
Net force on electric dipole is towards right and net torque acting on it is zero.
So, it will more towards right.
Therefore, the correct option is (C).
U=−→P⋅→E=−PEcosθ
Angle between electric field and electric dipole is 180∘.
∴U=−PEcos180∘=+PE
On moving towards right, electric field strength decrease therefore potential energy decrease.
Net force on electric dipole is towards right and net torque acting on it is zero.
So, it will more towards right.
Therefore, the correct option is (C).
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