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?

Step-by-step solution

Direction = E → × B → (i) ( j ^ + k ^ ) × ( j ^ + k ^ ) = 0 (ii) ( - j ^ + k ^ ) × ( - j ^ - k ^ ) = 0 + ı ^ - ( - ı ^ ) + 0 = 2 ı ^ (iii) ( j ^ + k ^ ) × ( - j ^ - k ^ ) = 0 (iv) ( - j ^ + k ^ ) × ( - j ^ + k ^ ) = 0