The change in the value of g at a height...

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?

`d=(h)/(2)`

`d=(3h)/(2)`

`d=2h`

`d=h`

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