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Q. The velocity of an electromagnetic wave in vacuum can be changed by changing

J & K CETJ & K CET 2009Electromagnetic Waves

Solution:

In free space speed of electromagnetic wave
$c=\frac{1}{\sqrt{\mu_{0} \varepsilon_{0}}}=\frac{E_{0}}{B_{0}}$
$=3 \times 10^{8} ms ^{-1}$
Thus, the value of electromagnetic wave is constant and cannot be changed by changing any of the given factors.