NEET2022PhysicsElectromagnetic WavesActual
When light propagates through a material medium of relative permittivity ϵ r and relative permeability μ r , the velocity of light, v is given by : ( c - velocity of light in vacuum)
Options
- Av = μ r ϵ r
- Bv = ϵ τ μ r
- Cv = c ϵ r μ r
- Dv = c
Correct answer
C. v = c ϵ r μ r
Step-by-step solution
We know, c = 1 μ 0 ε 0 for any medium v = 1 μ ε but μ = μ r μ 0 and ε = ε r ε 0 ∴     v = 1 μ r μ 0 ε r ε 0 = 1 μ r ε r × 1 μ 0 ε 0 = c μ r ε r