Electromagnetic Waves

For an electromagnetic wave, E₀ = cB₀ E₀ = 3×10⁸ × 20×10⁻⁹ = 6 V/m

we know that;
The direction of propagation of the electromagnetic wave is perpendicular to the plane of oscillation of electric and magnetic field of the EM wave.
Thus,
If, and are electric and magnetic field vectors of the EM wave, the direction of its propagation will be given by
As in an EM wave, the vectors and are perpendicular to each other, the direction of the wave propagation will be perpendicular to the plane containing the electric and magnetic field vectors.

Step 1: {Using the Speed of Light Formula}
Step 2: {Solving for }
Thus, the correct answer is .