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A plane electromagnetic wave is propagating in a lossless dielectric. The electric field is
given by
Ē(x,y,z,1)= E₁ (ŵ+ A²)exp[ik, {_ct+ (x+√3 =)}],
where c is the speed of light in vacuum, E, A and k are constant and ✰ and 2 are
unit vectors along the x- and z-axes. The relative dielectric constant of the medium &
and the constant A are
1
1
(a) &,
= 4 and A =
(b) &, = 4 and A = +-
(c) &₁ = 4 and A = √√3
(d) ₁ = 4 and A = -₁
-√√3

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