Figure shows variation of acceleration due to gravity with distance from centre of a  uniform spherical planet, Radius of planet is $R$. What is $r_2 -r_1.$

827-92

  • A

    $\frac{R}{4}$

  • B

    $\frac{7R}{4}$

  • C

    $\frac{4R}{3}$

  • D

    $2R$

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