Question

Easy point...

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. In the similar manner, force due to any portion of the Earth at the centre will be cancelled due to the portion opposite to it. Thus, the gravitational force at the centre on any body will be 0.

Explanation:

Answer 2

Let's see why g is 0 at centre of earth

$\\ \rm\rightarrowtail g\propto \dfrac{1}{h}$

Means g is indirectly proportional to height of object.

• If height is more gravity is less
• If height is less gravity is more

At centre h=0

• So if height is 0 then gravity is also zero.

And at centre the distance from top of earth surface is equal in opposite directions from centre.

So

$\\ \rm\rightarrowtail F_{net}=0$

• So gravity remains 0