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State Biot-Savart's law and express this...

State Biot-Savart's law and express this law in the vector form.

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Biot-Savart's law states that the magnetic field induction at a point due to current I in element of legth `dl`, at distance r from the element is

`dB=(mu_0)/(4pi)(Idlsintheta)/(r^2)`
`dvecB=(mu_0)/(4pi)(I(dveclxxvecr))/(r^3)`
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