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  3. 1 54 three rods of equal length are joined to form

1 54 Three rods of equal length are joined to form an equilateral triangle PQR...

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1 54 Three rods of equal length are joined to form an equilateral triangle PQR O is the mid point of PQ Distance OR remains same for small change in temperature Coefficient of linear expansion for PR and RQ is same i e a but that for PQ is a Then R APRF App X2 DEL A A2 2 ExPx Rx x1 4 42 2 Q P 042 a 3 g b a 4 a c a 3 d a 4

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