Bio Sawart's Law
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Description:
Biot-Savart’s law states that for the generation of magnetic field there should be a current and to generate current in a conductor there should be a length along which the charge can travel. This length is known as current element.
The magnetic field due to the current element idl→ at a point is given by the expression -
dB α
idlsinθr2
∴ dB =
μ04π
idlsinθr2
where,
idl→ = Current element, its direction is same as that of current.
r→ = Position vector of point P w.r.t. current element.
θ = Angle between current element and position vector.
μ0 = Permeability of free space and μ0 = 4π × 10-7 T mA-1
Observations
If current element is longer then the strength of magnetic field will be greater.
As the point moves away from the conductor, the strength of magnetic field keeps on decreasing.
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