Question

A given wire of resistance 1 ohm is stretched to double its length.what will be the new resistance?

Answer 1

Let the length of the wire be some x m.

Then the resistance is 1 ohm.

Since the resistance and length are directly proportional to each other then ,

when the length gets doubled then the resistance also gets doubled.

That is the new length of the wire is 2x m. Therefore,

the new resistance is 2 ohm.