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See Gaussian-CGS v. SI units [0]. It really confused me going from a CGS physics class to an EE electrodynamics course!

[0] https://en.wikipedia.org/wiki/Gaussian_units

Oh yes. This is definitely a pet peeve of mine. CGS is so much nicer. I did E&M from Jackson before he converted it to MKS, and I still can't keep all those epsilon_0 and mu_0's straight. (Not that it comes up all that much.)

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