Two different wires having length L1 and L2 and respective temperature coefficient of linear expression are joined end to end. then the effective temperature coefficent of linear expansin is:
Option: 1
Option: 2
Option: 3
Option: 4
Correct Answer: a)
As,
The coefficient of linear expansion of first wire of length L1? is
and,
The coefficient of linear expansion of first wire of length L2? is
Now, if a single wire of linear expansion α is taken instead of two wires,
Putting the value of
We get,
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