The velocity of electromagnetic radiation in a medium of permittivity $\varepsilon_0$ and permeability $\mu_0$ is given by:
- A$\sqrt{\frac{1}{\mu_0 \varepsilon_0}}$
- B$\sqrt{\frac{\mu_0}{\varepsilon_0}}$
- C$\sqrt{\frac{\varepsilon_0}{\mu_0}}$
- D$\sqrt{\mu_0 \varepsilon_0}$
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