At a certain depth "$d$" below surface of earth. value of acceleration due to gravity becomes four times that of its value at a height $3\,R$ above earth surface. Where $R$ is Radius of earth (Take $R =6400\,km$ ). The depth $d$ is equal to $............\,km$

  • [JEE MAIN 2023]
  • A

    $5260$

  • B

    $640$

  • C

    $2560$

  • D

    $4800$

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