For a plane electromagnetic wave propagating in x -direction, which one of the following combinations gives…

For a plane electromagnetic wave propagating in x-direction, which one of the following combinations gives the correct possible directions for the electric field (E) and magnetic field (B) respectively?
  1. j^+k^, j^+k^
  2. -j^+k^, -j^-k^
  3. j^+k^, -j^-k^
  4. -j^+k^, -j^+k^

Solution

Direction =E→×B→

(i) (j^+k^)×(j^+k^)=0

(ii) (-j^+k^)×(-j^-k^)

=0+ı^-(-ı^)+0

=2ı^

(iii) (j^+k^)×(-j^-k^)=0

(iv) (-j^+k^)×(-j^+k^)

=0

Asked in: NEET 2021

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