A) \[3\times {{10}^{8}}\,\,m/s\]
B) zero
C) infinite
D) none of these
Correct Answer: A
Solution :
Velocity of electromagnetic waves in vacuum is given by \[C=\frac{1}{\sqrt{{{\mu }_{0}}{{\varepsilon }_{0}}}}\] (here:\[{{\mu }_{0}}=4\pi \times {{10}^{-7}}\,\,N/{{m}^{2}}\] \[{{\varepsilon }_{0}}=\frac{1\times coulom{{b}^{2}}}{4\pi \times 9\times {{10}^{9}}N\times {{m}^{2}}})\] \[{{\varepsilon }_{0}}=\frac{1}{\sqrt{4\pi \times {{10}^{-7}}\times \frac{1}{4\pi \times (9\times {{10}^{9}})}}}\] \[=\sqrt{9\times {{10}^{16}}}=3\times {{10}^{8}}\,\,m/s\]
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