A copper wire and an aluminimum wire of the same diameter have their lengths in the ratio of 1:2 and their resistivitgies in the ratio of 5:9 compar their resistances.

Two wires of the same material have their lengths in the ratio 3:2 , diameters in the ratio 3:2 and streching forces in the ratio 3:4 . What is the ratio of their extension