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## Homework Statement

If B0 = 5*10^-7 [T], relative permittivity = 2 and relative permeability = 1.15 how much energy is delivered to an area of 1m^2 by the wave in one second?

Where B0 is a magnetic field measured in teslas.

## Homework Equations

< P > = ((B0^2)*c*(1)) / (2*(vacuum permeability))

(1 is the area given to me)

## The Attempt at a Solution

My problem here is that I don't know how to use the relative permittivity and relative permeability. I've been googling for a few hours to try and find a relation between them and the poynting vector but i can't find anything at all.

I know c = 1/root(vacuum permittivity*vacuum permeability) but that doesn't really help me.

I'm pretty sure that's the equation I have to use but i'm thinking i need to *modify* it. My best guess is that maybe i should use c/n instead so the equation would be:

< P > = ((B0^2)*c*(1)) / (2*(vacuum permeability)*n)

n = root(relative permittivity * relative permeability)

Can anyone confirm if this is right and if not how would you use the relative permittivity and relative permeability?

Thanks

Richy

edit: c = 1/root(vacuum permittivity*vacuum permeability) (forgot the 1 over originally whoops)

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