NEET 2018 Physics Elasticity MCQ Question
Two wires are made of the same material and have the same volume. The first wire has cross-sectional area A and the second wire has cross-sectional area 3A. If the length of the first wire is increased by Δl on applying a force F, how much force is needed to stretch the second wire by the same amount?
9 F
6 F
4 F
F
Correct Answer
Detailed Explanation
Using the formula for Young's modulus, the force required is inversely proportional to the cross-sectional area for the same extension.
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