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Electromagnetic waves travelling in a medium having relative permeability, \( \mu_{r}=1.3 \) and relative
\( \mathrm{P} \)
permittivity \( \varepsilon_{r}=2.14 \). The speed of electromagnetic
W
waves in the medium must be:
(1) \( 1.8 \times 10^{8} \mathrm{~ms}^{-1} \)
(2) \( 1.8 \times 10^{4} \mathrm{~ms}^{-1} \)
(3) \( 1.8 \times 10^{6} \mathrm{~ms}^{-1} \)
(4) \( 1.8 \times 10^{2} \mathrm{~ms}^{-1} \)
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