Question

formula to calculate electric field from epsilon

Answer 1

Also called the permittivity of free space, it is an ideal physical constant that represents the absolute dielectric permittivity of a vacuum. In other words, epsilon naught quantifies the ability of a vacuum to allow electric field lines to flow through. It is approximately 8.854 × 10^-12 farads per meter. E=kq/r^2. where k=1/4πepsilon