If the change in the value of ' $g$ ' at a height ' $h$ ' above the surface of the earth is same as at a depth $x$ below it, then ( $x$ and $h$ being much smaller than the radius of the earth)

  • A

    $x=h$

  • B

    $x=2 h$

  • C

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

  • D

    $x=h^2$

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