Electromagnetic waves travel in a medium with speed of 1.5 × 1 0 8 m s − 1 . The relative permeability of the medium is 2.0 . The relative permittivity will be:

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​ ε 0 ​ × μ 0 ​ ε m ​ × μ m ​ ​ = c 2 1 ​ v 2 1 ​ ​ ε r ​ × μ r ​ = v 2 c 2 ​ ε r ​ × 2 = ( 1.5 × 1 0 8 ) 2 ( 3 × 1 0 8 ) 2 ​ ε r ​ × 2 = 4 ε r ​ = 2 ​

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