Question
Write the expression for speed of electromagnetic waves in a medium of electrical permittivity $\in$ and magnetic permeability $\mu$.
✓
Answer
$c=\frac{1}{\sqrt\mu\in}$
Alternate Answer
$c=\frac{1}{\sqrt{\mu_0\mu_r\in_0\in_r}}$
Alternate Answer
$c=\frac{1}{\sqrt{\mu_0\mu_r\in_0\in_r}}$
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