Question

the resistance of a 10m long wire is 10ohm its length increased by 25%by stretching the wire uniformly the resistance of the wire will change​

Answer 1

There will be no change in the resistance of the wire after stretching.

If you want to know why? Then check the attachment.

Answer 2

Answer:

15.6Ω

Explanation:

Given, l1=l+25100l=5l4.

Since, volume of wire remains unchanged on increasing length, hence

A1l1=Al

A1×5l4=Al or  A1=4A/5

Given, R=ρl/A=10Ω

and R1=ρl1A1=ρ5l/44A/5=25ρl16A

∴ R1=2516×10=25016=15.6Ω