Directions: Carry Two Marks Each.

The electric field of a plane wave that is propagating in a lossless non-magnetic medium is given by

E(z, t) = a_x 5 cos(2^_$\pi$ x 10⁹ t + ^_$\beta$z) + a_y3 cos x (2^_$\pi$ x 10⁹t + ^_$\beta$z - ^{$\frac{\pi}{2}$})

The polarization is

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