The speed of any electromagnetic wave (EM) like light in any medium of permeability, μ and permittivity, ε is given by v=με1 Also, μ=μ0μr and ε=ε0εr where, μ0 and ε0 are permeability and permittivity in free space and μr and εr are relative permeability and relative permittivity of medium respectively. Here, μr=1.0 εr=1.44 ∴v=μrεrμ0ε01=μrεrc[∵c=μ0ε01]=1×1.443×108=2.5×108 ms−1
For a transparent medium relative permeability and permittivity μ_ and ε_ are 1.0 and 1.44 respectively. The velocity of light in this medium would be
NEET UG 2019 — Physics Electromagnetism
2019mcqeasy
For a transparent medium relative permeability and permittivity μr and ϵr are 1.0 and 1.44 respectively. The velocity of light in this medium would be
Official previous-year question
Held on 30 Apr 2019 · Verified 9 Jul 2026.
Options
- A
2.5×108 m/s
- B
3×108 m/s
- C
2.08×108 m/s
- D
4.32×108 m/s
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