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A plane electromagnetic wave propagating in a non magnetic dielectric medium is given by E=E0sin[2×107x50t], where 'x' is in meter and 't' is in second. If the relative permeability of the medium μr=1 then the dielectric constant of the medium is

a
2.50
b
4.80
c
8.20
d
1.44

detailed solution

Correct option is D

Speed of electromagnetic wave in Vacuum is  C=1μ0∈0Speed of electromagnetic wave in a dielectric medium of dielectric constant (k) is given by  C'=1kμ0∈0=CkFrom given equation  C'=ωk=502×10−7C'=52×108m/s  and  C=3×108m/s Using,  C'=Ck ⇒52×108=3×108k ⇒254=9k ⇒k=1.44

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