NEET 2016 Physics Thermal Expansion MCQ Question
Coefficient of linear expansion of brass and steel rods are α1 and α2. Lengths of brass and steel rods are l¹ and l² respectively. If (l² − l¹) is maintained same at all temperatures, which one of the following relations holds good?
α1l2² = α2l1²
α1l¹ = α2l²
α1l² = α2l¹
α1l2² = α2l1²
Correct Answer
Detailed Explanation
For the difference in length to remain constant, the expansion must be proportional to the square of the lengths, hence α1l2² = α2l1².
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