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MIT 8.01 Physics I Classical Mechanics, Fall 1999 17 Online
OpenStudy (anonymous):

can energy be contained within a magnetic field?

OpenStudy (kainui):

Short answer: yes.

OpenStudy (anonymous):

could u please speak clearly,kainui

OpenStudy (usman1995):

well it depends energy have a lot of forms if u are talking about heat energy then definitely no. but if you speak of electric energy than yes and if u speak of light energy than again no ,u see this phenomenon is not so simple...

OpenStudy (kainui):

So one way of storing energy in a magnetic field is to take a coil of wire, then connect it to a battery. What's that going to do? It makes an electromagnet, right? So you have made a magnetic field. But when you disconnect the battery, what happens to the magnetic field? Well, it goes away right? That means you have a changing magnetic field. What do we know about changing magnetic fields? They make electric fields, which pushes current along. You can't do that without energy, can you?

OpenStudy (usman1995):

but the question asks can energy be "contained within a magnetic field", not can magnetic field produce energy

OpenStudy (kainui):

Energy is conserved... The magnetic field didn't produce energy out of nothing! It's like the difference between potential and kinetic energy, but now we're talking about magnetic fields instead of gravitational ones.

OpenStudy (radar):

In planned space exploration, (this is just speculation), according to a television program (I think it was NOVA) a "plasma drive" was being channeled within a magnetic flux because the temperature was so extreme (7 times hotter than the surface of the sun) that there was no known material that could do the job without being evaporated.

OpenStudy (anonymous):

yes energy is contained in magnetic field using a inductor as it is stored in a capacitor

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