If a wire is stretched to double of its length.What will be the strain

[qazi75]

If a wire is stretched to double of its length.What will be the strain of wire?I need to prove it mathematically that how it becomes 1.

 

[sophiecentaur]

Welcome
What is the basic definition of strain?
Look it up and put the values for initial and final length in the formula.

 

[qazi75]

Thanks you sir.
Basic definition is:Change in length/original length.So change in length is 2l.And original length is l.So it becomes 2.While the correct answer to this statement is 1.

 

[Thundagere]

You've got something messed up here.

The CHANGE in length. So, what is the final length? 2I. What's the initial? I.
CHANGE = FINAL LENGTH - INITIAL LENGTH
2I is not the change. Keep that in mind and try the equation again. See what you get.

 

[qazi75]

Thanks you very much!Got it.