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1

To basically summarize and re-organize the linked-to answers: 1) When a charge $q$ is moving (say at velocity v) through a perfect conductor such as an ideal wire, it requires no force to maintain its velocity because it encounters no resistance. This is good, since there can be no electric field inside a perfect conduct and thus no force can be applied to ...

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I don't think you have noticed one of the ways that the experimenters of old did it. Here is a link to some of Joseph Henry's student notes, gathered by the Joseph Henry project at Princeton. If your world has a magnetic field, then you can simply hold a small ferromagnetic bar so that the local planetary magnetic field is roughly aligned with the bar and ...

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In an ideal battery, there is no energy "loss" inside the battery during operation, but it is probably literally not the case that $\vec{f}=\vec{0}$ pointwise inside the battery, even in an ideal (no power loss) situation. Let's carefully review what happens inside a circuit and a battery in electrostatic equilibrium. Force (per unit charge) is different ...

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