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RAJASTHAN ­ PET Rajasthan PET Solved Paper-2001

  • question_answer
    The intensity of electric field at a point on the axis of an electric dipole depends on the distance r from the centre of the dipole as

    A)  \[E\propto \frac{1}{{{r}^{2}}}\]                

    B)  \[E\,\propto \frac{1}{{{r}^{3}}}\]

    C)  \[E\propto \,{{r}^{2}}\]           

    D)  \[E\propto \,\frac{1}{{{r}^{4}}}\]

    Correct Answer: B

    Solution :

     Intensity of electric field at axis line of dipole \[E=\frac{1}{4\pi {{\varepsilon }_{0}}}\frac{2p}{{{r}^{3}}}\] Or \[E\propto \frac{1}{{{r}^{3}}}\]


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