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The expression for an electric field in free space is , $E=E_{0}\left ( \hat{x}+\hat{y}+j2 \hat{z} \right )e^{-j\left ( \omega t-kx+ky \right )}$ where $x,y,z$ represent the special coordinates, $t$ represents time, and $\omega,k$ are constants.This electric field,

  1. Does not represent a plane wave
  2. Represents a circularly polarized plane wave propagating normal to the $z$-axis
  3. Represents an elliptically polarized plane wave propagating along the $x$-$y$ plane
  4. Represents a linearly polarized plane wave
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