Question

write biot-Savart expression for the magnetic field due to a current element???

Answer 1

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Answer 2

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The Biot-Savart's law gives the magnetic field produced due to a current carrying segment. The magnitude of the magnetic field dB at a distance r from a current carrying element dl is found to be proportional to I and to the length dl. And is inversely proportional to the square of the distance |r|.