(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

If the amplitude of the electric field of the light propagating through a glass whose refractive index is 1.5 is 100 V/m, what is the amplitude of the magnetic field?

What is the magnitude of the Poynting vector associated with this wave?

2. Relevant equations

Not sure for the first question and the second is [tex]\vec E \times \vec H[/tex] if if I remember well.

3. The attempt at a solution

So the second question is easily answered when I know what is the worth the magnetic field. I really don't know any equation that relates the E field and the B field of a wave.

Maybe Maxwell's equation? This one in particular (using Gaussian units): [tex]\frac{\partial B}{\partial t}=-c \vec \nabla \times \vec E[/tex].

Or maybe I should write the solution to the wave equation of the light in the medium?

I'm not really sure how it would be. [tex]E(x,t)=E_0 \cos (\omega t + \vec k \cdot \vec x )[/tex] or something like that, I'm not sure.

That's a good problem, I wasn't aware one could get the B field from the E field in the wave of light.

Any tip?

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Light, EM wave

**Physics Forums | Science Articles, Homework Help, Discussion**