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Given below are two statements:
Statement $I$ : A time varying electric field is a source of changing magnetic field and vice-versa. Thus a disturbance in electric or magnetic field creates $EM$ waves.
Statement $II$ : In a material medium. The $EM$ wave travels with speed $v =\frac{1}{\sqrt{\mu_{0} \varepsilon_{0}}}$.
In the light of the above statements, choose the correct answer from the options given below
Both statement $I$ and statement $II$ are true
Both statement $I$ and statement $II$ are false
Statement $I$ is correct but statement $II$ is false
Statement $I$ is incorrect but statement $II$ is true
Solution
The statement $II$ is wrong as the velocity of $sm$ wave in a medium is $\frac{1}{\sqrt{\mu \varepsilon}}=\frac{1}{\sqrt{\mu_{0} \mu_{ r } \varepsilon_{0} \varepsilon_{ r }}}$.
