Six copper wires are characterized by their dimensions and by the current they carry. Rank the wires in order of decreasing drift velocity.

(a) Diameter 2 mm, length 2 m, current 80 mA
(b) Diameter 1 mm, length 1 m, current 80 mA
(c) Diameter 4 mm, length 16 m, current 40 mA
(d) Diameter 2 mm, length 2 m, current 160 mA
(e) Diameter 1 mm, length 4 m, current 20 mA
(f) Diameter 2 mm, length 1 m, current 40 mA