Question

The oscillating electric and magnetic vectors of an electromagnetic wave are oriented along

• A. the same direction but differ in phase by ${90}^{\circ }$.
• B. the same direction and are in phase.
• C. mutually perpendicular directions and are in phase.
• D. mutually perpendicular directions and differ in phase by ${90}^{\circ }$.

Answer 1

Answer: (C)

mutually perpendicular directions and are in phase.

Electric and magnetic vectors are mutually perpendicular to each other and are in phase, i.e., they become a zero and minimum at the same place and at the same time.