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A plane electromagnetic wave propagating along y-direction can have the following pair of electric field (E⃗) and magnetic field (B⃗) components. (1) Ey, By or Ez, Bz (2) Ey, Bx or Ex, By (3) Ex, Bz or Ez, Bx (4) Ex, By or Ey, Bx

1. Ey, By or Ez, Bz
2. Ey, Bx or Ex, By
3. Ex, Bz or Ez, Bx
4. Ex, By or Ey, Bx

Correct answer: Ex, Bz or Ez, Bx

Solution

The correct option indicates that the electric field (E) and magnetic field (B) components are perpendicular to each other and to the direction of wave propagation, which is a fundamental characteristic of electromagnetic waves. In this case, Ex and Bz or Ez and Bx satisfy this requirement, as they are oriented correctly with respect to the y-direction of propagation.

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