When a charged particle is placed inside a spherical shell, the electric field inside remains zero, resulting in a constant electric potential. Introducing another charged particle near the shell alters this balance, creating a non-constant electric potential and an electric field. The electric field will vary from zero to a specific value, while the potential will change from its initial constant value to a new level. This phenomenon occurs regardless of whether the additional charge is placed inside or outside the shell. The presence of the new charge fundamentally alters the electric field and potential in the surrounding area.
