Electromagnetic Theory: Unit III: (a) Magnetostatics

Magnetic field intensity (H) at the Centre of a Circular Conductor

• Consider the current carrying conductor arranged in a circular form as shown in the Fig. 7.6.1.

 at the Centre of a Circular Conductor

• Consider the current carrying conductor arranged in a circular form as shown in the Fig. 7.6.1.


• The  at the centre of the circular loop is to be obtained. The conductor carries the direct current I.

• Consider the differential length  at a point 1.

• The direction of  at a point 1 is tangential to the circular conductor at point 1.


Using the definition of cross product,


• According to Biot-Savart law, the differential magnetic field intensity  at point P is,


• The flux  at centre of the circular conductor carrying direct current I, placed in a free space is given by,



Review Question

1. Derive an expression for the flux density at the centre of a circular loop carrying current I.


Electromagnetic Theory: Unit III: (a) Magnetostatics : Tag: : - Magnetic field intensity (H) at the Centre of a Circular Conductor