Multiple choice

A plane wave having the electric field component $E_1$ = 24 cos(3$\times$108t -$\beta$y)$\widehat a_z$V/m and traveling in free space is incident normally on a lossless medium with m = m0 and e = 9e0 which occupies the region y ≥ 0. The reflected magnetic field component is given by

  1. $\dfrac{1}{10\pi} cos(3 \times 10^8 t + y) a_x \ A/m $
  2. $\dfrac{1}{20\pi}$cos (3$\times$108t + y)$\widehat a_x$ A/m
  3. -$\dfrac{1}{20\pi}$cos (3$\times$108t + y)$\widehat a_x$ A/m
  4. - $\dfrac{1}{10\pi}$cos (3$\times$108t + y)$\widehat a_x$ A/m
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