Energy In a magnetic field?

by Hypo
Tags: energy, field, magnetic
 P: 316 the energy density of a magnetic field is 1/2 B^2/$\mu$ So if you have a region with a magnetic field, you integrate that over the region to find the total energy of the magnetic field. think of it like a hose - pushing the ends of opposing hoses together is hard because the water is pushing them apart. The reason there is energy in the magnetic field is the same as the hose - you need energy to have the water flowing. But these analogies only start to make sense of it, there is no "flowing water" in a magnetic field, unless you're a fan of the old ether theory. Just think of it as a "thing" and whenever there is a "thing", no matter what it does, energy is needed to create it and the energy is stored in it until it is destroyed. Conservation of energy always applies.