What is the relationship between the electric and magnetic fields of an electromagnetic wave?
They travel at different speeds
They are in parallel
They revolve in opposite directions
They are at right angles✓Correct answer
Explanation
An electromagnetic wave carries an electric field and a magnetic field that are perpendicular to each other and to the direction of travel. They are in step in time and travel together at the same speed, so answers describing different speeds or parallel fields are wrong.