Saturday 2 February 2013

What is Biot- Savart Law and drive explanation of magnetic field of current

Biot- Savart Law

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

Magnetic field of wire

Vector form of Biot- Savart Law


vector form of Biot- Savart


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