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Biot-Savart’s Law

Biot-Savart’s law is used to determine the magnetic field at any point due to a current carrying conductor.
This law is although for infinitesimally small conductor yet it can be used for long conductors. In order to understand the Biot-Savart’s law, we need to understand the term current-element.
According to Biot-Savart’s law, magnetic field at point P due to the current element 81732.png is given by the expression, 81738.png also 81744.png
In C.G.S., k = 1 and in S.I., 81750.png. where μ0 = Absolute permeability of air or vacuum = 4π × 10–7 Weber/Ampere-meter. It’s other units are;
Fig. 8
Vectorially, 81776.png

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