Two identical wires of substance ' P ' and ' Q ' are subjected to equal stretching force along the length. If the elongation of ' Q ' is more than that of ' P ', then
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: Young's modulus, 
.
where F is the stretching force applied, L is the original length, A is the area and 
is the extension in the length of wire of substances P and Q.
Considering, the given wire ' P ' and ' Q ' are identical i.e., both the wires have same length and same area and an equal stretching force is applied along the length of the two wires.
Since, the elongation of ' Q ' is more than that of ' P ' so, the Young's modulus of Q is less than that of ' P '. Therefore P is more elastic than Q because greater the value of Young's modulus of a substance, higher is its elasticity.
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