Question

If the length of a wire is doubled, then its resistance becomes

• A. four times
• B. two times
• C. one-fourth
• D. half

Answer 1

The correct option is B two times

We know that, Resistance of a wire $R=\frac{\rho l}{A}$

$\therefore R\propto l$

When length $l$ is doubled, while Area $A$ & resistivity $\rho$ remains the same.

Hence, the new resistance becomes two times the initial resistance, Option(B) is correct