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JEE Main & Advanced Physics Electrostatics & Capacitance Question Bank Electric Dipole

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    An electric dipole has the magnitude of its charge as q and its dipole moment is p. It is placed in a uniform electric field E. If its dipole moment is along the direction of the field, the force on it and its potential energy are respectively [CBSE PMT 2004]

    A)                    \[2q\cdot E\] and minimum                                      

    B)            \[q\cdot E\] and \[p\cdot E\]

    C)            Zero and minimum            

    D)            \[q\cdot E\] and maximum

    Correct Answer: C

    Solution :

               In the given condition angle between \[\vec{p}\] and \[\vec{E}\] is zero. Hence potential energy \[U=-\,pE\cos 0=-\,pE\,=\min .\] Also in uniform electric field \[{{F}_{net}}=\text{ }0\].


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