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Physics
Classical Physics
Electromagnetism
Definition of current density J?
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[QUOTE="Dale, post: 6020267, member: 43978"] The force on T is mediated by the fields at T’s position. The concept of a test charge can be introduced for the fields. It does not need to be introduced twice, and in fact doing so would be problematic as you would now have two sets of test charges, one for the fields and another for the sources, and with no particular requirement that they be the same. No, the idea of test charges for defining current density is not only unnecessary for your above example, it is a fundamentally bad idea and inconsistent with the literature. [/QUOTE]
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Physics
Classical Physics
Electromagnetism
Definition of current density J?
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