  This manuscript is devoted to study the combined effect of a viable model,
f(R) = R + \alpha R^n, and electromagnetic field on the instability range of
gravitational collapse. We assume charged anisotropic fluid that dissipate
energy via heat flow and discuss that electromagnetic field, density
inhomogeneity, shear and phase transition on astrophysical bodies can be
incorporated by locally anisotropic background. Dynamical equations help to
investigate the evolution of self-gravitating objects and leads to the
conclusion that adiabatic index depend upon the electromagnetic background,
mass and radius of the spherical objects.
