Two identical copper spheres of radius `R` are in contact with each other. If the gravitational attraction between them is `F`, find the relation between `F` and `R`.

Explanation

To solve the problem, we need to find the relationship between the gravitational force \( F \) between two identical copper spheres and their radius \( R \).

### Step-by-Step Solution:

1. **Understanding the Setup**:
- We have two identical copper spheres, each with a radius \( R \).
- The distance between the centers of the two spheres when they are in contact is \( 2R \).

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