# Comment: Actually there is substantial

(See in situ)

In reply to comment: There is no such thing (see in situ)

### Actually there is substantial

Actually there is substantial energy stored in a magnetic field. But you can only get it out by disrupting whatever is creating the field to make the field go away.

That's where the "inductive kick" comes from. Transformers work by using electrical energy to create this magnetic field with one coil, then taking some-to-most of it out with another. The amount of energy in the magnetic field within the transformer core, at its peak mid-cycle, is at least the amount of energy transferred through the transformer in a half-cycle of the frequency in question.

You can also get an equivalent amount of energy by moving loops of conductor in a way that makes the mag field APPEAR to go away - but in that case the energy you get from the conductor comes from pushing on the conductor to move it, not from the magnetic field, which is really still there.

The Earth's field is low intensity but very large. I haven't run the numbers, but (if you COULD), I doubt collapsing it would release enough energy to run the power grid for a time measured in seconds. Then you'd be waiting for a few hundred years for the Geophysical Dynamo to build it up again. Meanwhile you'd lose the Van Allen belts and the Earthy's magnetic shield against charged particle bombardment.

Meanwhile, you don't get to collapse a magnetic field like the Earth's by sticking an apparatus in it. You'd have to disrupt the generation of the field by the convection of underground lava. That might take a bit of energy to dig up the planet. B-)

That means: For each job "created or saved" about five were destroyed.