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

  • question_answer
    A point \[Q\] lies on the perpendicular bisector of an electrical dipole of dipole moment \[p\]. If the distance of \[Q\] from the dipole is \[r\] (much larger than the size of the dipole), then electric field at \[Q\] is proportional to                                                            [CBSE PMT 1998; JIPMER 2001, 02]

    A)                    \[{{p}^{-1}}\] and \[{{r}^{-2}}\]                                

    B)            \[p\] and \[{{r}^{-2}}\]

    C)                    \[{{p}^{-1}}\] and \[{{r}^{-2}}\]

    D)                                      \[p\] and \[{{r}^{-3}}\]      

    Correct Answer: D

    Solution :

               \[{{E}_{equatorial}}=\frac{kp}{{{r}^{3}}}\] i.e. \[E\propto p\] and \[E\propto {{r}^{-3}}\]


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