Two identical heavy spheres are separated by a distance 10 times their radius. Will an object placed at the mid-point of the line joining their centres be in stable equilibrium or unstable equilibrium ? Give reason for your answer.

Explanation

To determine whether an object placed at the midpoint of the line joining the centers of two identical heavy spheres is in stable or unstable equilibrium, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Setup**:
- We have two identical heavy spheres, each with a radius \( r \).
- The distance between the centers of the spheres is \( 10r \).
- The midpoint between the two spheres is at a distance of \( 5r \) from each sphere.
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