A piece of wire of resistance 20 Ω is drawn out so that its length is increased to twice its original length. Calculate the resistance of the wire in the new situation.

Question

A piece of wire of resistance 20 &#x3A9; is drawn out so that its length is increased to twice its original length. Calculate the resistance of the wire in the new situation.

Philoid · Accepted Answer

We known that

Now if we stretch the same wire in such a way that its length get double. At the same time its area of cross-section decrease to half. So that