STANDARD Physics Dipole in Electric Field Multiple Correct Question
An electric dipole of moment P is placed in a uniform electric field E. Then (i) the torque on the dipole is p×E. (ii) the potential energy of the system is p·E. (iii) the resultant force on the dipole is zero. Choose the correct option.
(i), (ii) and (iii) are correct.
(i) and (iii) are correct and (ii) is wrong.
Only (i) is correct.
(i) and (ii) are correct and (iii) is wrong.
Correct Answer
Detailed Explanation
In a uniform electric field E, a dipole experiences a torque τ given by τ = p×E but experiences no force. The potential energy of the dipole in a uniform electric field E is U = –p·E.
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