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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2009

  • question_answer
        An electric dipole placed in a uniform electric field will have minimum potential energy when the dipole moment is inclined to the field at an angle

    A)  \[\pi \]                                

    B)  \[\frac{\pi }{2}\]

    C)  zero                                     

    D)  \[\frac{3\pi }{2}\]

    Correct Answer: C

    Solution :

                    Since,                    \[U=-\overrightarrow{P}\,\,\overrightarrow{E}\] \[\Rightarrow \]                               \[U=E\text{ }cos\theta \] So, U is minimum When,                  \[\theta =0{}^\circ \]


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