A plane electromagnetic wave propagates along the + x direction in free space. The components of the electric field, E and magnetic field, B vectors associated with the wave in Cartesian frame are (a) Ex, By (b) Ey, Bx (c) Ey, Bz (d) Ez, By

Answer: (c). For propagation along +x, E and B lie in the y-z plane and E∥+i. (a), (b), (d) contain an x-component, not allowed for a transverse wave. j = i, so Ey, Bz works. So the answer is (c) Ey, Bz.

A plane electromagnetic wave propagates along the + x direction in… | JEE Main 2025 (29 Jan, Shift 2)

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Nature of EM Waves & Wave Equation

A plane electromagnetic wave propagates along the + x direction in free space. The components of the electric field, $\vec{E}$ and magnetic field, $\vec{B}$ vectors associated with the wave in Cartesian frame are

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Answer: (c)

For propagation along $+x$ , $\vec{E}$ and $\vec{B}$ lie in the y-z plane and $\vec{E}\times\vec{B}\parallel+\hat{i}$ .
(a), (b), (d) contain an x-component, not allowed for a transverse wave.
$\hat{j}\times\hat{k} = \hat{i}$ , so $E_y, B_z$ works.
So the answer is (c) $E_y, B_z$ .

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