An electromagnetic wave is traveling through free space. The amplitudes of the wave's electric and magnetic fields are E 0 E0 an
d B 0 B0 , respectively. The wave then passes through a filter that reduces the amplitude of the electric field by half ( E 0 / 2 ) (E0/2) . What is the amplitude of the magnetic field after the wave passes through the filter?
Since c is constant whatever happens to the electric field amplitude will also affect the magnetic field amplitude. In the same vein if the electric field amplitude is halfed, the magnetic field amplitude will also be halfed. Hence
