Question

For dielectrics, which two components will be in phase?

(a) E and wave direction

(b) H and wave direction

(c) Wave direction and E x H

(d) E and H

This question was posed to me in examination.

I'd like to ask this question from Dielectric vs Conductor Wave Propagation in section EM Wave Propagation of Electromagnetic Theory

Answer 1

The correct choice is (d) E and H

The best I can explain: In dielectrics, the electric and magnetic components E and H will be in phase with each other. This is due the variation in the permittivities and the permeabilities of the dielectric surfaces. The phase difference between E and H will be 0.