A) \[v=\frac{1}{\sqrt{{{\mu }_{r}}K}}\]
B) \[v=c\sqrt{{{\mu }_{r}}K}\]
C) \[v=\frac{c}{\sqrt{{{\mu }_{r}}K}}\]
D) \[v=\frac{K}{\sqrt{{{\mu }_{r}}C}}\]
Correct Answer: C
Solution :
[c] Speed of light of vacuum\[c=\frac{1}{\sqrt{{{\mu }_{0}}{{\varepsilon }_{0}}}}\]and in another medium \[v=\frac{1}{\sqrt{\mu \varepsilon }}\] \[\therefore \,\,\,\frac{c}{v}=\sqrt{\frac{\mu \varepsilon }{{{\mu }_{0}}{{\varepsilon }_{0}}}}=\sqrt{{{\mu }_{r}}K}\Rightarrow v=\frac{c}{\sqrt{{{\mu }_{r}}K}}.\]
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