Question

Meena draws magnetic field lines of the field close to the axis of a current-carrying circular loop. As she moves away from the centre of the circular loop she observes that the lines keep on diverging. How will you explain her observation :

Answer 1

Electric current in a circular loop creates a magnetic field which is more concentrated in the center of the loop than outside the loop.
Concentric circles are formed, which are centered at the point where the wire passes through the cardboard. The lines near the center of the loop are almost straight. The magnetic field at the centre of the loop is perpendicular to the plane of the loop. The concentric circles become larger as we move away from the wire because as the distance increases from the current carrying conductor the strength of the magnetic field fades away.
Thus, the strength of the magnetic field is inversely proportional to the distance from the current carrying conductor. That is, as the distance increases the magnetic field decreases. Hence, Meena observes that the lines keep diverging as she moves away from the circular loop.