Question

explain with a reason whether the field will stronger at the centre of current carrying loop or near the circumference of the loop

Answer 1

For the magnetic field lines of a circular wire carrying a current the lines of force near the wire almost concentric circles. As move towards the centre of the loop the concentric circles become larger and larger. Near the centre of the loop the arcs of this big circles a pair of parallel straight lines. Thus the magnetic field is almost uniform at the centre of the loop. By applying right hand thumb rule we can see that the magnetic field lines due to all section of wire are in the same direction within the loop. That is the field is stronger at the centre.