PLEASE EXPLAIN EXAMPLE 9.2 OF TEXTBOOK....OF CHAPTER MECHANICAL PROPERTIES OF SOLID....REPLY FAST experts!

This question is very well explained in the ncert.

The basic this in this question is that, we know that stress is equal to,

Stress = Force / Area of the cross-section of  wire = W/A

We also know that, stress = staine x Young's modulus. 

Now equating the value of the stress for both the wires.

And follow the steps given in the ncert. 

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