In cgs, the electric susceptibility is defined as the ratio of polarization P to electric field strength E,
where is the electric permittivity (Purcell 1985, p. 372).
In MKS, the electric susceptibility is defined as
where is the permittivity of free space (Griffiths 1998, p. 156)
D, Electric Displacement, Electric Permittivity, Electrical Conductance, Magnetic Susceptibility, Polarization
References
Griffiths, D. J. Introduction to Electrodynamics, 3rd ed. Englewood Cliffs, NJ: Prentice-Hall, 1998.
Purcell, E. M. Electricity and Magnetism, 2nd ed. New York: McGraw-Hill, p. 372, 1985.
