NEET 2013 Physics Elasticity MCQ Question
If the ratio of diameters, lengths and Young’s modulus of steel and copper wires shown in the figure are p, q and s respectively, then the corresponding ratio of increase in their lengths would be:
5q/2
7q/42
(7sp)/(5sp)
(5sp)/(7sp)
Correct Answer
Detailed Explanation
The increase in length is inversely proportional to the product of Young's modulus and cross-sectional area. Using the given ratios, the correct ratio is (7sp)/(5sp).
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