The production of a magnetic field by moving charges is described by the Biot-Savart Law and Ampère's Law (in its original form). The production of a magnetic field by a changing electric field is one of Maxwell's equations (Ampère- Maxwell Law), involving the concept of displacement current.
A magnetic field can be produced by
Asked in WBCS Main Paper 4 2023 · Topic: Electric Current (Definition of Electric Current and current density)
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