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Uttarakhand PMT Uttarakhand PMT Solved Paper-2010

  • 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, \[U=-\overrightarrow{p}\overrightarrow{E}\] \[\Rightarrow \] \[U=-pE\cos \theta \] So, U is minimum when, \[\theta =0{}^\circ \]


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