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  4. The speed of electromagnetic waves depends upon

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Q. The speed of electromagnetic waves depends upon

Electromagnetic Waves

Solution:

Speed of wave $=\frac{1}{\sqrt{u \varepsilon}}$
$=\frac{I}{\sqrt{\mu_{0} \,\mu_{r}\, \varepsilon_{0} \,\varepsilon_{r}}}$
It depends upon the medium.