JEE Main & Advanced Sample Paper JEE Main - Mock Test - 35

  • question_answer
    The region between two concentric spheres of radii 'a' and 'b' respectively (see figure), has volume charge density\[\rho =\frac{A}{r}\], where A is a constant and r is the distance from the r centre. At the centre of the spheres is a point charge Q. The value of A such that the electric field in the region between the spheres will be constant, is

    A) \[\frac{Q}{2\pi ({{b}^{2}}-{{a}^{2}})}\]

    B) \[\frac{2Q}{\pi ({{a}^{2}}-{{b}^{2}})}\]

    C) \[\frac{2Q}{\pi {{a}^{2}}}\]

    D) \[\frac{Q}{2\pi {{a}^{2}}}\]

    Correct Answer: D

    Solution :

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