Question

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

Answer 1

Answer:

At the centre of Earth, the force due to upper half of the Earth will cancel the force due to lower half. ... Therefore, when F=0, then g has to be 0. Thus, the value of g is zero at the centre of Earth.

Answer 2

Answer:

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

Hope it helps you.