Three rods of equal length l are joined to form an equilateral triangle PQR. O is the midpoint of PQ. Distance OR remains same for small change in temperature. Coefficient of linear expansion for PR and RQ is same i.e. 
but that for PQ is 
. Then
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Neglecting 
and 
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