Current I is flowing in a conductor of lenth I. It is bent to form a circular coil of one turn. The same conductor is then bent in the form of a coil of two turns. What is the ratio of magnetic field at the centre in the first case and second case.
1
1 ∶ 4
2
4 ∶ 1
3
1 ∶ 2
4
1 ∶ 1