Question

The direction of Poynting vector is perpendicular to the direction of propagation of wave.

(a) True

(b) False

I have been asked this question by my school teacher while I was bunking the class.

I want to ask this question from Poynting Theorem topic in section Electrodynamics of Engineering Physics II

Answer 1

Right option is (b) False

The explanation is: The Poynting vector is proportional to the cross product of Electric and magnetic field, E X B. Therefore, its direction is perpendicular to Electric and Magnetic waves, i.e., in the direction of propagation of wave.