Magnetic field due to straight current carrying conductor

Magnetic field due to straight current carrying conductor

Consider a straight conductor carrying current I is as shown in figure. Let P be the point at a distance r from conductor where we have to draw a concentric circle of radius r. The direction of magnetic field at pint P is given by the tangent of the circle. Where the direction of B and dl is along the same direction and angle between them is 0°.

 

 

From Ampere’s Law we know the magnetic field due to straight current carrying conductor is


Magnetic field due to straight current carrying conductor
This is the magnetic field due to straight current carrying conductor.