Three copper wires are there with lengths and cross sectional areas as (l,A); (2l,A/2); (l/2,2A).

Three copper wires are there with lengths and cross sectional areas as (l,A); (2l,A/2); (l/2,2A). Resistance:
1) minimum for the wire of cross-sectional area A/2
2) minimum for the wire of cross-sectional area A
3) minimum for the wire of cross-sectional area 2A
4) same for all the three cases