The field due to a wire of n turns and radius r which carries a current I is measure on the axis of the coil at a small distance h form the centre of the coil. This is smaller than the field at the centre by the fraction:

Options

A. `(3/2(h^(2))/(r^(2))`
B. `2/3(h^(2))/(r^(2))`
C. `3/2(r^(2))/(h^(2))`
D. `2/3(r^(2))/(h^(3))`

Answer

A