You have a one cubic meter block of copper with which to connect a device to a power supply. If you had to choose one and only one of the following geometries to shape the copper into to form a connector, which of them would give you the LOWEST resistance?
1) Since the material is the same, the geometry of the wire does not change the resistance
2) A wire with a square cross section, width of each side is 1cm
3) A wire with a square cross section, width of each side is 2cm
4) A wire with a circular cross section, radius 1.2cm