Question

If a wire is stretched to double its length, then the resistance will become

• A. half
• B. double
• C. one fourth
• D. four times

Answer 1

Answer: (B)

double

Without considering the change on area , The resistance becomes doubled.
$\text{Resistance}=\frac{\rho L}{A}$ (Here $\rho$ is the resistivity of the material) Hence if length is doubled, then resistance is also doubled.