Acceleration due to gravity at depth d & effect of depth on the value of acceleration due to gravity

Chapter: Gravitation : Find the expression of acceleration due to gravity at a depth d ::::
The acceleration due to gravity at a point A on earth surface is
g = 4π ρ G R ; where R is the radius of earth
The acceleration due to gravity at the point B at depth d below earth surface is
g'' = 4π ρ G . R -d
∴ g'' / g = R - d / R
∴ g'' = g . 1 - d / R
*** • Acceleration due to gr...

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