If we double the radius of a current carrying coil keeping the current unchanged, the magnetic field at its centre

If we double the radius of the coil keeping the current through it unchanged, the magnetic field on its axis at very very far away points

Find the magnetic field induction at a point on the axis of a circular coil carrying current and hence find the magnetic field at the centre of circular coil carrying current.

Find the magnetic field induction at a point on the axis of a circular coil carrying current and hence find the magnetic field at the centre of circular coil carrying current.

A coil of 50 turns and 4cm radius carries 2A current then magnetic field at its centre is :- ?

When the current flowing in a circular coil is doubled and the number of turns of the coil in it is halved , the magnetic field at its centre will become

The magnetic field at the centre of current carrying coil is