Ncert Exercises & Solutions

A plane electromagnetic wave propagating along x-direction can have the following pairs of E and B.

(a) E_x, B_y
(b) E_y, B_z
(c) B_x, E_y
(d) E_z, B_y

1. (b, c)
2. (a, c)
3. (b, d)
4. (c, d)

(3) Hint: The direction of the electromagnetic wave is perpendicular to both the electric field and the magnetic field.

Step 1: Find the direction of the electric field and the magnetic field.

As electric and magnetic field vectors E and B are perpendicular to each other as well as perpendicular to the direction of propagation of the electromagnetic wave. Here in the question, the electromagnetic wave is propagating along the x-direction. So, the electric and magnetic field vectors should have either y-direction or z-direction.

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