A) 1.0
B) 1.8
C) 2.5
D) none of these
Correct Answer: B
Solution :
: \[\frac{v}{c}=\frac{1}{\sqrt{{{\mu }_{r}}{{\varepsilon }_{r}}}}\] \[\frac{2.5\times {{10}^{8}}}{3\times {{10}^{8}}}=\frac{1}{\sqrt{0.8\times {{\varepsilon }_{r}}}}\] \[{{\varepsilon }_{r}}=\frac{3\times 3}{0.8\times 2.5\times 2.5}=1.8\]
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