A) \[\frac{\varepsilon \mu }{{{\varepsilon }_{0}}{{\mu }_{0}}}\]
B) \[{{\left( \frac{\varepsilon \mu }{{{\varepsilon }_{0}}{{\mu }_{0}}} \right)}^{1/2}}\]
C) \[\left( \frac{{{\varepsilon }_{0}}{{\mu }_{0}}}{\varepsilon \mu } \right)\]
D) \[{{\left( \frac{{{\varepsilon }_{0}}{{\mu }_{0}}}{\varepsilon \mu } \right)}^{1/2}}\]
E) none of these
Correct Answer: B
Solution :
Velocity of light in vacuum \[c=\frac{1}{\sqrt{{{\mu }_{0}}{{\varepsilon }_{0}}}}\] Velocity of light in medium \[v=\frac{1}{\sqrt{\mu \varepsilon }}\] \[\therefore \] \[\mu =\frac{c}{v}={{\left( \frac{\mu \varepsilon }{{{\mu }_{0}}{{\varepsilon }_{0}}} \right)}^{1/2}}\]
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