Magnetic field at the centre of a circular coil

2022 Phase 2 1 question

1. A closely packed coil having 1000 turns has an average radius of 62.8 cm. If the current carried by the wire of the coil is 1 A, the value of magnetic field produced at the centre of the coil will be (permeability of free space $=4\pi\times10^{-7}$ H/m) nearly: