Static charges and steady currents are responsible for electrostatic and steady magnetic fields, respectively. A static field arises from a charge Q at rest, whereas, for a steady field, a constant current I = dQ/dt is responsible; both represent states of the charge carriers relative to the observer. However, charge and current are not exclusive, and both electric and magnetic fields can be observed as related with time-dependent Q and I, as discussed for magnetic induction.
KeywordsAlternate Current Free Oscillation Cauchy Theorem Voltage Relation Alternate Current Voltage
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