The correct answer is: A. 90 degree to each other.
An electromagnetic wave is a wave that consists of an electric field and a magnetic field oscillating at right angles to each other and to the direction of the wave’s propagation. The electric and magnetic fields are in phase with each other, meaning that they reach their maximum and minimum values at the same time.
The electric and magnetic fields of an electromagnetic wave are perpendicular to each other because they are generated by the motion of electric charges. When an electric charge moves, it creates an electric field. This electric field then creates a magnetic field. The magnetic field then creates an electric field, and so on. This process continues to create an electromagnetic wave that travels through space.
The electric and magnetic fields of an electromagnetic wave are also perpendicular to the direction of the wave’s propagation because they are generated by the motion of electric charges. When an electric charge moves, it creates an electric field that is perpendicular to the direction of the charge’s motion. This electric field then creates a magnetic field that is perpendicular to the electric field and to the direction of the charge’s motion. The magnetic field then creates an electric field, and so on. This process continues to create an electromagnetic wave that travels in a straight line.
The electric and magnetic fields of an electromagnetic wave are also in phase with each other because they are generated by the same source. The electric field is generated by the motion of electric charges, and the magnetic field is generated by the electric field. The electric and magnetic fields are therefore in step with each other, and they reach their maximum and minimum values at the same time.