Magnetics with polygon

Electricity and Magnetism Level 4

A conducting wire of length $L$ is converted into a regular polygon of $n$ sides. On passing, a current of $I$ through the wire produces a magnetic field of intensity $B$ at the center. Find the value of $B$ .

Details and Assumptions:

$I = 5 A, L = 2 m, n = 15.$
Give your answer in $\mu T$ correct to two decimal places.