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State Biot-Savert's law....

State Biot-Savert's law.

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Biot-Savart.s Law : According to this law magnetic field due to a small conductor of length dl, carrying current I at a distance r is given by
`dB = (mu_0)/(4pi) (Idl sin theta)/(r^2)`
where `theta` = Angle between the small current element and line joining the mid-point of current element to the observation point.
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