Explain with the help of a labelled diagram the distribution of magnetic field due to a current through a circular loop. Why is it that if a current carrying coil has n turns, the field produced at any point is n times as large as that produced by a single turn?

Explanation

In a current -carrying circular loop also the Right-Hand Thumb Rule is being obeyed. This means magnetic field lines are around the conducting wire. But circular shape of the conductor means that field lines at different points of the loop appear to be making ring around the periphery of the loop. It can be visualized like many small rings looping around the periphery of a big ring.
Effect of number of turns in a coil : If number of turns in coil is increased , then magnetic field also increases Due to this, strength of magnetic field increases with increased number of turns in a coil.