A hollow metal ball carrying an electric charge produces no electric field at a point:

is it inside the ball?

yes, no charge inside.

To determine whether an electric field is produced at a point inside a hollow metal ball carrying an electric charge, we can rely on two key principles:

1. Electric Field Inside a Conductor: Inside a conductor (such as a hollow metal ball), the electric field is always zero.
2. Electrostatic Shielding: When a conductor is charged, the electric field inside it is completely shielded. Any excess charge resides on the outer surface of the conductor, distributing itself uniformly.

Applying these principles to the question, we can conclude that yes, there will be no electric field at a point inside a hollow metal ball carrying an electric charge. This is due to the combination of the electric field inside a conductor being zero, and the electrostatic shielding effect.

In summary, the absence of an electric field inside a hollow metal ball carrying an electric charge is a result of the properties of conductors and electrostatic shielding, where the excess charge resides only on the outer surface of the conductor.