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An EM wave from air enters a medium. The electric fields are

 

in air and E2=E02xcos[k(2z-ct)] in medium, where the wave number k and frequency v refer to their values in air. The medium is non-magnetic. If ∈r1 and ∈r2 refer to relative permittivity of air and medium respectively, which of the following options is correct ?

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Ans. (2)

velocity of EM wave is given by 1/√μ∈

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