Electromagnetic waves: The energy per unit volume in an electromagnetic wave is
A) equally divided between the electric and magnetic fields.
B) mostly in the electric field.
C) mostly in the magnetic field.
D) all in the electric field.
E) all in the magnetic field.

Question

Quizplus · Accepted Answer

In an electromagnetic wave, the energy per unit volume is equally divided between the electric and magnetic fields. This is known as the Poynting vector, which describes the direction and magnitude of energy flow in an electromagnetic wave.

Electromagnetic Waves: the Energy Per Unit Volume in an Electromagnetic