Question

how will the resistivity of a conductor change when its length is tripled by stretching it

Answer 1

As we know that resistance is directly proportional to lengh of wire or conductor...

Hence,when length is tripled the resistance will also be 3 times...

Answer 2

the resistance of a conductor is directly proportional to the length of that conductor
So if the length is tripled then its resistance will also increases by 3 times