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PhysicsEM WavesElectromagnetic wavesEasy2 minPYQ_2022

PhysicsEasysingle choice

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)NEET 2022 (Phase 1)

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Answer:

Solution:

We know, $c = \frac{1}{\sqrt{μ_{0} ε_{0}}}$

for any medium

$v = \frac{1}{\sqrt{μ ε}}$ but $μ = μ_{r} μ_{0}$ and $ε = ε_{r} ε_{0}$

$∴ v = \frac{1}{\sqrt{μ_{r} μ_{0} ε_{r} ε_{0}}}$

$= \frac{1}{\sqrt{μ_{r} ε_{r}}} \times \frac{1}{\sqrt{μ_{0} ε_{0}}} = \frac{c}{\sqrt{μ_{r} ε_{r}}}$

Stream:NEETSubject:PhysicsTopic:EM WavesSubtopic:Electromagnetic waves

⏱ 2mℹ️ Source: PYQ_2022

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