The ratio of speeds of electromagnetic waves in vacuum and a medium, having dielectric constant k = 3 and permeability of μ = 2μ₀, is (μ₀ = Permeability of Vacuum)

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(3) √6 : 1. In the medium v = 1/√με with εᵣ = k = 3 and μᵣ = μ/μ₀ = 2 c/v = √μ₀ε₀⁻¹ ÷ √με⁻¹ = √μᵣεᵣ = (2 × 3) = √6

The ratio of speeds of electromagnetic waves in vacuum and a medium, having dielectric constant k = 3 and permeability of μ = 2μ₀, is (μ₀ = Permeability of Vacuum)

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