The change in the value of $g$ at a height $h$ above the surface of the earth is the same as at a depth $d$ below the surface of earth. When both $d$ and $h$ are much smaller than the radius of earth, then which one of the following is correct ?

  • A

    $d = \frac{h}{2}$

  • B

    $d = \frac{3h}{2}$

  • C

    $d = 2h$

  • D

    $d = h$

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