Question

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

Answer 1

There's gravity everywhere - it's an intrinsic property of all matter that has non-zero mass. If you were at the centre of the Earth it would feel like you were weightless. This is because all of the forces on you that result from the Earth's gravity are balanced. Mass attracts mass.....

Hope it helped buddy. . .

Answer 2

At the center of the earth, you would feel weightlessness, because the mass surrounding you would be pulling on you equally in all directions.