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Force fields and law of conversation of energy

by ElmorshedyDr
Tags: conversation, energy, fields, force
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ElmorshedyDr
#1
Mar28-14, 07:55 PM
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Why aren't force fields such as magnetic, electric and gravitational fields considered as a violation to law of conversation of energy??
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Drakkith
#2
Mar28-14, 08:01 PM
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Why would they be?
ElmorshedyDr
#3
Mar28-14, 08:03 PM
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Quote Quote by Drakkith View Post
Why would they be?

After I wrote the topic It came on my mind that my question is illogical since all these forces arise due to the potential gained by the body.

Drakkith
#4
Mar28-14, 08:05 PM
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Force fields and law of conversation of energy

Actually I think energy is the result of these forces interacting with objects, not the other way around.
WannabeNewton
#5
Mar29-14, 10:07 AM
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Quote Quote by Drakkith View Post
Actually I think energy is the result of these forces interacting with objects, not the other way around.
No, the OP had it correct. Given a field, the forces on particles coupling to the field arise from derivatives of the coupling term(s). In the simplest cases (e.g. EM), this would be (minus the) the gradient of the potential energy. A more general treatment can be found in the formalism of classical field theory.
HomogenousCow
#6
Mar29-14, 11:51 PM
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The fields themselves have energy and momentum (dynamic fields anyways), this combined with the energy and momentum of the matter fields is conserved assuming all interactions are mediated by the field.


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