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The biot-savart law state that magnitude of magnetic field
at a point due to current distribution is directly proportional to amount of
current and effective length of
conductor and inversely proportional to square of distance between current
distribution and point.
Explanation of magnetic field of current due to Biot- Savart Law
Consider a small section dL of a wire carrying current i. Let P be the observation point at distance R from the centre of element dL. The position vector of P subtends an angle θ with the direction of flow of current in element dL as shown in fig.
I f dB is the magnetic field intensity at
point due to this small element dL
it has been observed that
Vector form of Biot- Savart Law
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