Recent content by Onufer

I would say its zero because it takes zero energy to move a point charge in from infinite since its field does not effect itself and we generally consider the energy of a charge distribution to be the energy required to assemble the system. probably wrong though. I'm not uncomfortable with...

Cool. That's what i thought too but wasn't sure. Applying that volume and surface integral equation i get: W = 1/(2u) *(integral B^2 over inside volume + integral B^2 over outside volume - surface integral of AxB) I'm going to divide everything by z since i was interested in the energy per...

Btw all Griffiths equations mentioned and the derivation of B^2/(2u) were on page 318

My professor had an example in class the other day where we had an infinite line of current uniformly distributed over a circular wire with radius R. He wanted to look at the energy of the B field produced by this current. He did the normal thing and integrated 1/2u*B^2 over all space. It...