Question

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

1. E_x, B_y.
2. E_y, B_z.
3. B_x, E_y.
4. E_x, B_y.

Options

• b and c

• a and c

• b and d

• c and d

Answer 1

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.