In a metal spherical shell with a non-centered charge +q in its cavity, the induced negative charges on the inner surface are not uniformly distributed due to the asymmetrical influence of the +q charge. However, the outer surface of the shell must have a uniformly distributed positive charge to maintain electrical neutrality and ensure that the electric field inside the shell's material is zero. This uniform distribution occurs because there is no net electric field acting on the charges as they move to the outer surface. The electric flux through any Gaussian surface within the shell material remains zero, confirming that the net electric field is also zero. Understanding the process of charge distribution is essential to grasping the electrostatic equilibrium in this scenario.