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If electric permittivity and magnetic permeability of the medium are respectively ‘ε’ and ‘μ’, then the velocity (Cm) of the electromagnetic wave in the medium is given by:
Options:
A .  Cm = 1/εμ
B .  Cm = 1/√8 μ
C .  Cm = 5/√εμ
D .  None of these
Answer: Option B
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