A planar frame is made of thin uniform rods. The length of section AB and EF is 
and its coefficient of linear expansion is 
. The length of section CD is 
and its coefficient of linear expansion is 
. CB and DE are of the same length having coefficient of linear expansion 
Points A, B, E and F reside on same line, that is, sections AB and EF overlap. Then the ratio 
for which the distance between end A and end F remains the same at all temperatures is 
then find the value of n.
Text Solution
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2
For distance between A and F to remain constant, extension in CD = extension in AB + extension in EF
Or 
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