Write the expression for the magnetic induction at any point on the axis of circular current-carrying coil. Hence, orbtain an expression for the magnetic induction at the centre of the circular coil.

Explanation

i) Intensity of magnetic induction field on the axis of the circular coil B `=(mu_(0) n I r^(2))/(2(r^(2)xx x^(2))^(3//2)`
ii) At the centre of the coil `B=(mu_(0) n i)/(2 r)`