Question

How does the resistance of a wire change when its length is tripled ?

• A. Resistance will remain same
• B. Resistance will be 1/3rd of previous one
• C. Resistance will be 9times
• D. Resistance will be 3times

Answer 1

The correct option is D Resistance will be 3times

Resistance of the wire $R=\rho \frac{L}{A}$

$⟹$ $R\propto L$ ($\because \rho ,A$ are constants)

Thus resistance will become 3 times if the length of the wire is tripled.