Draw and discuss the pattern of the magnetic lines of force of a current carrying circular loop.
Magnetic field due to a current through a circular loop: Fig. shows the magnetic field lines of a circular wire carrying a current. The lines of force near the wire are almost concentric circles. As we move towards the centre of loop, the concentric circles become larger and larger. Near the centre of the loop, the arcs of these big circles appear as parallel straight lines. Thus the magnetic field is almost uniform at the centre of the loop. By applying right hand rule, we can see that the magnetic field lines due to all sections of the wire are in the same direction within the loop.
Fig. Magnetic field lines of a circular current loop
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