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If ' $c$ ' is the speed of electromagnetic waves in vacuum, then their speed in a medium of dielectric constant ' $\mathrm{K}$ ' and relative permittivity ' $\mu_{\mathrm{r}}$ ' is ____
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The correct answer is:
$\frac{\mathrm{c}}{\sqrt{\mu_{\mathrm{r}} \mathrm{K}}}$
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