Q_Goest
Science Advisor
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Think of it this way: The only thing that differentiates a positive charge from a negative one is that they are opposite. There is nothing intrinsic to the nature of the charge itself such that one must be called "positive" and one must be called "negative". We could equally have switched these words. The only thing intrinsic to them is that they are opposite charges, and thus all physical laws remain identical if we only recognize that the opposite charges attract and identical charges repel. This includes the magnetic field as well.