Physics · Electromagnetic Waves
The electric field of a plane electromagnetic wave travelling in an unknown non-magnetic medium is given by Ey = 20 sin(3 × 106 x - 4.5 × 1014 t) V/m (where all values are in S.I. units). The dielectric constant of the medium is: (Speed of light in free space = 3 × 108 m/s)
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