Recent content by Ben473

Hello, Im just an amateur physicsist and was interested in Fermi Energy. Found a page http://http://hyperphysics.phy-astr.gsu.edu/hbase/solids/fermi2.html#c1" , that helped. However, I found the page and site a bit hard to understand in some places. Could someone please explain to me...

Thanks Tiny Tim, Mentz 114 and Robphy. Appreciate your help and I understand this equation a lot better. Thanks, Ben. P.S. Nice secret message Robphy!

I know what the equation for proper time is in basic Euclaiden space. But when space-time is concerned, I get a bit confused. The equation is: \Delta\tau=\sqrt{g_{\mu\nu}dx^{\mu}dx^{\nu}} I realize that g_{\mu\nu} is the Metric tensor. However i don't understand the dx's and their indices...

Thanks Tiny-Tim, I had an inkling that this was the case, but i wasnt sure. Ben.

Thanks, I get it now. I really appreciate your help. Ben.

Thanks Alex and JtBell. That really helps. I think I understand it now. But if I was to do this on a real life object, how would I work out the i and j indices? Ben.

Hi Andy, What I fully understand is the Electric and Magnetic constants. Im not so sure on the Kronecker Delta. Everything else is a bit 'iffy'! I presume that the i and j indices are unit vectors. Would I be right in saying this? What I was really asking for (should have been more...

Would someone please be able to run me through the different components of the Maxwell Stress Tensor equation. 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} E^2 \right) I don't understand some of it and...