How Is the Biot-Savart Law Derived?

Maxwellkid
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how is the Biot Savart law derived?? From where does it come?
 
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Experiment shows that B depends on current,conductor geometry etc and I assume that Biot and Savart started with experimental results from geometries such as straight wires and solenoids and worked backwards to find a general equation that covers all integratable geometries.
 
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