Question

A 1.0m length of wire is found to have a resistance of 40 ohm. What would be the resistance of a wire of a piece of same wire of length 2.0m

Answer 1

Answer:

We can solve by direct proportion resistance also increase 80ohm

Explanation:

I am not sure about answer I hope it will help you

Answer 2

Answer:

Given data:

$L_{1}$ = 1.0 m

$R_{1}$ = 40 Ω

$L_{2}$ = 2.0 m

$R_{2}$ = ?

For stretched wire, we have

$R_{2}$ = $n^{2}$ $R_{1}$    

Since    $L_{2}$ = 2 $L_{1}$     i.e. length increases 2 times

So     $R_{2}$ = $2^{2}$ (40)

              = 4 (40) = 160 Ω

Explanation: