Interactions between electrons and nuclei of particles produce an electromagnetic field. Electric and magnetic fields are perpendicular forces that are interrelated. As electromagnetic radiation propagates, it is influenced by both planes of electromagnetism simultaneously. The magnetic field pulls electromagnetic waves one way, while the electric field pulls them the other. The forces of electromagnetism cause the wavelike qualities of electromagnetic waves. The repeated oscillation that causes peaks and troughs in electromagnetic waves are caused by the fields of electromagnetism.