A plane electromagnetic wave propagating along x direction can have the following pairs of E and B. a. Ex, By. b. Ey, Bz. c. Bx, Ey. d. Ex, By.

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b and d Explanation: As the EM wave is plane polarized and its propagation is in +X direction. So direction of vecE and vecB will be in either Y and Z direction or Z and Y direction. Here in the question, electromagnetic wave is propagating along the x-direction. So, electro and magnetic field vectors should have either y-direction or 2-direction.

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