The electric field inside a perfectly conducting hollow object is

In electrostatics, the electric field inside a perfectly conducting object is zero. When a conductor is placed in an external electric field, free electrons within the metal redistribute themselves until the internal field they create exactly cancels the external field. This state is known as electrostatic equilibrium, where no further motion of charge occurs. This principle applies even to hollow conductors or those with cavities, provided no charges are placed inside the cavity. This phenomenon is the basis for electrostatic shielding, often referred to as the Faraday cage effect, where the interior is protected from external electrical influences. Gauss's Law further supports this, as any excess charge on a conductor resides entirely on its outer surface to minimize repulsive forces, leaving the interior net charge and field at zero.