A cylindrical metallic wire is stretched to increase its length by 5%. Calculate the percentage change in resistance.

Explanation

Given % change in length, `(dl)/(l) = 5%`
Resistance of wire `R = (rho l^(2))/(V)`
% change in Resistance of wire,
`(dR)/(R ) = 2 (dl)(l) = 2 xx 5% = 10 %`