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

  • question_answer
    An electric dipole of moment \[\overrightarrow{p}\] placed in a uniform electric field \[\overrightarrow{E}\] has minimum potential energy when the angle between \[\overrightarrow{p}\] and \[\overrightarrow{E}\] is                                                                         [UPSEAT 2004]

    A)                    Zero           

    B)                                      \[\frac{\pi }{2}\]

    C)                    \[\pi \]

    D)                                      \[\frac{3\pi }{2}\]

    Correct Answer: A

    Solution :

                       \[U=-PE\cos \theta \] It has minimum value when q = 0o i.e. \[{{({{U}_{P}})}_{\min }}=-PE\times \cos {{0}^{o}}=-PE\]


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