The force of attraction due to a hollow spherical shell of uniform density on a point mass situated inside it is zero. This can be explained using the concept of gravitational forces and symmetry.

1. Gravitational Force:
Gravitational force is the force of attraction between two objects with mass. According to Newton's law of universal gravitation, the force of attraction between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

2. Hollow Spherical Shell:
A hollow spherical shell is a spherical shell with empty space inside it. It has a uniform density, which means that the mass is spread evenly throughout the shell.

3. Symmetry:
The key concept to understand here is symmetry. A hollow spherical shell has a symmetrical distribution of mass. This means that no matter where the point mass is situated inside the shell, the gravitational forces acting on it from all directions will cancel out.

4. Cancellation of Forces:
When the point mass is situated inside the hollow spherical shell, the gravitational forces acting on it from different directions will cancel each other out due to the symmetrical distribution of mass. For every force pulling the point mass in one direction, there is an equal and opposite force pulling it in the opposite direction. As a result, the net force on the point mass is zero.

5. Zero Force of Attraction:
Since the net force acting on the point mass is zero, the force of attraction due to the hollow spherical shell on the point mass is also zero. This means that the point mass will not experience any gravitational force from the shell.

In conclusion, the force of attraction due to a hollow spherical shell of uniform density on a point mass situated inside it is zero. This is because the symmetrical distribution of mass in the shell results in the cancellation of gravitational forces from all directions, resulting in a net force of zero.