NEET Questions Solved

NEET - 2016

 

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?

(a) α1l22=α2l12                (b) α12l2=α22l1

(c) α1l1=α2l2                (c) α1l2=α2l1

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Concept Questions :-

Thermal expansion

 

(c) According to question,

Coefficient of linear expansion of brass=α1

Coefficient of linear expansion of steel= α2

Length of brass and steel rods are l1 and l2 respectively.

As given difference in length l2-l1 is same for all temperature.

So,                                           l2'-l2'=l2-l1

      l21+α2t-l11+α1t=l2-l1                                             l2α2=l1α1

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