Question

a wire of Resistivity streached to 3times of its lenght what will be its new resistivity​

Answer 1

remains unchanged. Resistivity does not depend on length or area of cross-section. It just depends on the nature of the material of the wire.

Answer 2

Answer:

What will be its new resistivity? remains unchanged. Resistivity does not depend on length or area of cross-section. It just depends on the nature of the material of the wire.If The wire is stretched 3 times the original length, the cross-section of the wire is cut to 1/3rd it's the original cross-section. Since the resistance of a wire is given by R = rho*l/A the length while cutting the cross-section by 3x, the new resistance will be 9 times the original resistance.