Does the concentration of the earth's mass near its centre change the variation of `g` (acceleration due to gravity) with height from its surface?

Explanation

To determine whether the concentration of the Earth's mass near its center affects the variation of acceleration due to gravity (g) with height from its surface, we can analyze the situation using the principles of gravitation.

### Step-by-Step Solution:

1. **Understanding the Concept of g**:
The acceleration due to gravity (g) at a distance r from the center of the Earth is given by the formula:
\[
g = \frac{GM}{r^2}
...