Biot savart law6/15/2023 ![]() ![]() Let Φ 1 and Φ 2 be the angles wich point P makes with X and Y and Φ be the angle that P makes with dl.ĬASE 3: Field due to a circular current loopĬonsider a circular loop of radius r carrying current i and having N turns.ĬASE 4: Field at the centre of a current arc To find magnetic field consider a small current element at a distance l making an angle θ as shown.Īccording to Biot Savart Law, magnetic field at point P is: Where α, β are the angles between the wire and the lines joining the end points of wire to the point A where the field is to be calculated.Ĭonsider a conductor XY carrying current I in the direction from X to Y and P be the observation point at a distance 'a' from the straight conductor. The magnetic induction at a distance r from the wire is given by: ![]() ![]() If the wire is gripped in the right hand with the thumb in direction of current the curling fingers give the direction of lines of force in circles.ĬASE 2: Field of a straight current carrying wire of finite lengthĬonsider a straight wire PQ carrying a current i as shown. The magnetic lines of force for a long straight wire are concentric circles centred at the wire and lying in the plane perpendicular to the wire. The magnetic field due to a current carrying straight wire of infinite length at a distance r from the wire is CASE 1: Field of a straight infinite current wire
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