Asked by justy
                how do we calculate the current density given the magnetic field?
            
            
        Answers
                    Answered by
            drwls
            
    The magnetic field does NOT depend upon the local current density. The magnetic field depends upon the current density in the surrounding environment, wherever current is flowing. 
Read about the Biot-Savart law for more information.
    
Read about the Biot-Savart law for more information.
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