Question

If a copper wire is stretched to make it 0.1% longer, then the percentage change in its resistance
is approximately?
​

Answer 1

Answer:

0.1%

Explanation:

we know that,

the relation between the resistance and the length is as follows

R=pl/A

From this, resistance is directly proportional to the length....

so, ∆R/R×100=∆l/l×100

∆R/R×100=0.1%

Hope it helps you frnd.......