At what depth the acceleration due to gravity becomes zero ?

Explanation

To find the depth at which the acceleration due to gravity becomes zero, we can follow these steps:

### Step 1: Understand the formula for acceleration due to gravity at depth
The acceleration due to gravity at a depth \( d \) below the surface of the Earth is given by the formula:
\[ g' = g \left(1 - \frac{d}{r}\right) \]
where:
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