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# State and explain Biot-Savart Law.

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#### The Biot Savart Law is used to determine the magnetic field intensity B near a current carrying conductor in terms of magnetic field intensity generated by its source current element.Consider a wire carrying an electric current I and also consider an infinitely small length of a wire dl at a distance r from point A.Biot Savart Law states that magnetic intensity dB at a point A due to current I flowing through a small element dl is a) Directly proportional to current (I) b) Directly proportional to the length of the element (dl)c) Directly proportional to the sine of angle θ between the direction of current and the line joining the element dl from point A. d) Inversely proportional to the square of the distance (x) of point A from the element dl. dB∝Idlsinθr2dB=KIdlsinθr2where, K=μ0μr4π μ0= Absolute permittivity of air in vacuum μr= relative permittivity.

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