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The speed of light in vacuum is given by the expression:

1. $\epsilon_0\mu_0$
2. $\epsilon_0/\mu_0$
3. $\mu_0\epsilon_0$
4. $\dfrac{1}{\sqrt{\mu_0\epsilon_0}}$

Correct answer: $\dfrac{1}{\sqrt{\mu_0\epsilon_0}}$

Solution

From Maxwell’s equations, the speed of electromagnetic waves in vacuum is $c=\frac{1}{\sqrt{\mu_0\epsilon_0}}$. This is the standard relation for light in free space.

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