Ayesha Khalid2025-11-212025-11-212021https://escholar.umt.edu.pk/handle/123456789/11614The main purpose of this research is to study core-envelope model for anisotropic charged sphere by using the Einstein’s Maxwell field equations for compact stars. The equation of state is polytropic for core and linear for envelope. The core, envelope and the Reissner Nordström exterior regions of stars match smoothly. This discussion shows non-singularity, continuity at the collaboration and physical parameters inside stars. The presence of charge electric field in star influence the mass, radius, compactification factor and there effects on gravity. The metric potentials and matter distribution are well behaved.enThesis