Question

biot- savart's law explain

Answer 1

Bio savart law is used to calculate the magnetic field at a point...The source which create this magnetic field at that point is the current element...

Here current element is i x dl , where i is the amount of current flowing in a conductor and dl is the smallest length of the conductor...

Magnetic field due to this current element is so small...and denoted as dB...

So calculus comes into the picture here...
lets see how..

Suppose there is a conductor and i is the current flowing through it...and we want to calculate magnetic field at some point P around the conductor at a distance r say..

Then magnetic field at a point p and distance r from the conductor is given by Bio savart law as

dB = ů x i dl x Sin¤ / 4 Pie x r^2

Simply Biot-savart law is used to calculated magnetic field at a point...and the Source of this smallest magnetic field is Current element i.e i dl