Which statement about EMF wave properties is true?

Which statement about EMF wave properties is true?

• A. The E field and H field are mass-bearing.
• B. The E field and H field are charged particles.
• C. The E field and H field are perpendicular and have no mass or charge.
• D. The E and H fields are identical in direction.

Answer: (C)

In an electromagnetic wave, the electric and magnetic fields are actual field components that oscillate together and carry energy through space. In free space they are perpendicular to each other and also perpendicular to the direction the wave is traveling, forming a transverse wave. They do not have mass or electric charge themselves; fields are not particles and do not consist of charged or massive objects. The energy and momentum flow is described by the Poynting vector E × H, pointing in the direction of propagation. Because of this, the statement that the electric and magnetic fields are perpendicular and have no mass or charge best captures their true nature. The other descriptions would imply particles or parallel fields, which aren’t how electromagnetic waves behave.

In an electromagnetic wave, the electric and magnetic fields are actual field components that oscillate together and carry energy through space. In free space they are perpendicular to each other and also perpendicular to the direction the wave is traveling, forming a transverse wave. They do not have mass or electric charge themselves; fields are not particles and do not consist of charged or massive objects. The energy and momentum flow is described by the Poynting vector E × H, pointing in the direction of propagation. Because of this, the statement that the electric and magnetic fields are perpendicular and have no mass or charge best captures their true nature. The other descriptions would imply particles or parallel fields, which aren’t how electromagnetic waves behave.