Two metal rods of lengths 
and 
and coefficients of linear expansion 
and 
respectively, are welded together to make a composite rod of length ( 
) at 
. Find the effective coefficient of linear expansion of the composite rod.
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Given, the lengths of rods are 
and 
and coefficients of linear expansions are 
and 
. As, 
and 
and for combined rod,
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