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    The equation:

    Change in gravitational potentional
    --------------------------------------
    Change in distance between two points

    =g (Gravitational field strength)


    Where does this value of g exist? Halfway between the change in distance between the two points?
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    The equation is wrong

    g = rate of change of potential at a point, i.e. the slope of the tangent of a V against r graph at a point.

    g = dV/dr

    It is then the value of g at that point.
 
 
 
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