Question

explain why the value of g is zero at the centre of the earth

Answer 1

the value of g is higher at the poles as compared to the centre of the earth and hence the value of g is zero at the centre of the earth

Answer 2

Hey!

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When we move towards centre of earth, the mass is equally distributed in all directions.

The mass beneath you = Mass in front of you = Mass behind you

Thus, all the gravitational forces applied cancel each other and acceleration due to gravity (g) at centre of earth on centre of earth becomes zero (0).

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Hope it helps...!!!