## Relative permittivity and permeability

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### Relative permittivity and permeability

What is the magnitude of 1/4πϵ in cgs unit? Isnt it 1?

If it is so....then the value of µ0/4π should equal c^(-2) in cgs. Isnt it? But my physics teacher says it too equals 1....How is it possible....?

We know µ0/4π=(1/(4πϵ*c*c))=c^(-2) in cgs...(As 1/4πϵ=1)..Isnt it? Pls help...

Afif_D

Posts: 172
Joined: Wed Oct 06, 2010 2:56 pm UTC

### Re: Relative permittivity and permeability

You might want to take a look at the CGS wiki page.

Generally: Physics says µϵ = c^-2. CGS (unlike SI) does not specify a base measurement that sets specific units for electromagnetic quantities. Mostly, you either choose an "electric centric" system, with ϵ = 1 and µ = c^-2, or a "magnetic centric" system with µ = 1 and ϵ = c^-2. Neither of which seems to agree with your equations at all...
Life is mostly plan "B"

Goemon

Posts: 388
Joined: Mon Nov 19, 2007 4:57 am UTC