- #1

vwishndaetr

- 87

- 0

I have a couple basic questions about the stress tensor:

[tex] T_{ij} = \epsilon_0 \left( E_i E_j - \frac{1}{2} \delta_{ij} E^2 \right) + \frac{1}{\mu_0} \left( B_i B_j - \frac{1}{2} \delta_{ij} B^2 \right)[/tex]

For the component electric and magnetic fields (denoted with "i" and "j" indices), they are what they are. What ever the indice at the time, that particular component fills it in. But for both the squared Electric and Magnetic Field terms, what is being squared? Is it the

__magnitude of the net__field squared?

Might be a bit silly to be dealing with Tensors and asking such silly questions, but still want to know.

Thanks.