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A plane electromagnetic wave propagates along the x-direction. Which of the following pairs of E and B field components are POSSIBLE?

1. Eₓ, B_y
2. E_y, B_z
3. Bₓ, E_y
4. E_z, B_y

Correct answer: E_y, B_z

Solution

E and B must both be transverse for an EM wave. Options with Eₓ or Bₓ are invalid. E_y with B_z gives E x B along +x, consistent with propagation in +x. E_z with B_y gives propagation in -x. For propagation along +x direction: E_y, B_z is the correct pair.

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