The electric field of a plane electromagnetic wave, travelling in an unknown nonmagnetic medium is given by, E_ y =20 (3 × 10^ 6 x-4.5 × 10^ 14 t) V / m (where x, t and other values have S.I. units). The dielectric

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Correct answer: 4

From the wave equation E_y = 20 (3 × 10^6 x - 4.5 × 10^ 14 t) : Wave number: k = 3 × 10^6 m⁻¹ Angular frequency: ω = 4.5 × 10^ 14 rad/s Speed of wave in medium: v = (ω)/(k) = 4.5 × 10^ 14 3 × 10^6 = 1.5 × 10^8 m/s Speed of light in vacuum: c = 3 × 10^8 m/s Refractive index: n = (c)/(v) = (3 × 10^8)/(1.5 × 10^8) = 2 For a nonmagnetic medium: n = _r Dielectric constant: _r = n^2 = 4

The electric field of a plane electromagnetic wave, travelling in...

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