What is the maximum value of gravitational potential? Where ?

Explanation

To find the maximum value of gravitational potential energy and where it occurs, we can follow these steps:

### Step 1: Understand Gravitational Potential Energy
Gravitational potential energy (U) is defined in relation to the gravitational force (F) between two masses. The formula for gravitational potential energy is given by:

\[ U = -\int F \cdot dr \]
...