Hi everybody ! I would like to know if we can use the electromagnetic plane wave law : B₀ = E₀/c EVEN IF we're not in the vacuum?(well it's not specify in the problem solving help n1 of chapter 28)

Question

anonymous · Answer

The speed of light varies with the medium  (but is always less than c, the speed of light in vacuum) The relationship is only good in a vacuum as long as you use c as the speed of light in vacuum, but should hold if you replace c with the speed of light in the medium