1. v = c/√(ε_r μ_r) 2. v = c 3. v = √(μ_r/ε_r) 4. v = √(ε_r/μ_r)

Answer: 1. v = c/√(ε_r μ_r) In a medium, v=1/√(με) with μ=μ₀μ_r and ε=ε₀ε_r . Since c=dfrac1√(μ₀ε₀) , we get v=c/√(ε_rμ_r) . Option (1) is correct.

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)

1. \(v = \frac{c}{\sqrt{\epsilon_r \mu_r}}\)

2. \(v = c\)

3. \(v = \sqrt{\frac{\mu_r}{\epsilon_r}}\)

4. \(v = \sqrt{\frac{\epsilon_r}{\mu_r}}\)

Doubtly Asked 30 Oct 2026 NEET UG 2022 Practice test neet Save WhatsApp Report

Best answer

Answer: 1. \(v = \frac{c}{\sqrt{\epsilon_r \mu_r}}\)

In a medium, \(v=\dfrac{1}{\sqrt{\mu\epsilon}}\) with \(\mu=\mu_0\mu_r\) and \(\epsilon=\epsilon_0\epsilon_r\).

Since \(c=\dfrac1{\sqrt{\mu_0\epsilon_0}}\), we get \(v=\dfrac{c}{\sqrt{\epsilon_r\mu_r}}\).

Option (1) is correct.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

Was this answer helpful?