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The kind of magic without which all of this wouldn't be possible. This tag should be used for questions about the **physics** of the fields that charged particles create and how these fields interact. It should not be used for all questions involving electromagnetism; that would be everything on the site.

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Magnetic energy evaluation

How to evaluate magnetic energy when only vectors of magnetic induction B, and vector of magnetic field, H are known? We know that in general, $$W_m=\int w_mdV$$ where wm is the density of magnetic …
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