Question

a wire is streched to double its lenghth .what will be its new resistivity​

Answer 1

nothing will happen ..

resistivity depend on nature and temperature of material ..

THOUGH RESISTANCE WILL BE DOUBLE

THEN RESISTIVITY OF MATERIAL WILL BE INCREASE

Answer 2

As a wire gets longer its resistanceincreases, and as it gets thinner its resistance also increases because itscross sectional area decreases. Doubling the length will double the resistance, but the wire also must get thinner as it is stretched, because itwill contain the same amount of metalin twice the length.