A straight wire of diameter 0.5 mm carrying a current of

A straight wire of diameter 0.5 mm carrying a current of 1 A is replaced by another wire of 1 mm diameter carrying same current. The strength of magnetic field far away is

1. twice the earlier value
2. same as the earlier value
3. one-half of the earlier value
4. one-quarter of the earlier value

B =	μ₀i
	2πr

and so it is independent of thickness.
The current is same in both the wires, hence magnetic field induced will be same.