Fractional change in gravity with depth – Rankers Physics
Topic: Gravitation
Subtopic: Acceleration Due to Gravity and its variation

Fractional change in gravity with depth

The fractional change in acceleration due to gravity on surface of earth (g) when the body is taken to a depth h from the surface of earth, is (where R = radius of Earth)
\(1 - \frac{h}{R}\)
\(\frac{h}{R}\)
\(1 - \frac{2h}{R}\)
\(\frac{2h}{R}\)

Solution:

The acceleration due to gravity at depth \(h\) is \(g_d = g\left(1 - \frac{h}{R}\right)\). The change in gravity is \(\Delta g = g - g_d = g\frac{h}{R}\). Thus, the fractional change \(\frac{\Delta g}{g}\) is \(\frac{h}{R}\).

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