Question

Concentric circle representing magnetic field around circular loop becomes larger and larger as we move away from the wire

Answer 1

It is because the magnetism is faded as we move away from the wire.

Answer 2

 

When a current is passed through a circular loop, the concentric circles representing the magnetic field will be produced around every point of the current-carrying circular loop. The concentric circles would become larger and larger as we move away from the wire. At the centre of the circular loop, the arcs of these big circles would appear as straight lines. Every point on the wire carrying current would give rise to the magnetic field appearing as straight lines at the centre of the loop. By applying the right hand rule, we find that every section of the wire contributes to the magnetic field lines in the same direction within the loop

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