Heat and Thermal ExpansionHard

Question

Bars of two different metals are bolted together, as shown in figure. The distance  x does not change with temperature  if :-

Options

A.
B.
C.
D.

Solution

x = l′A - l′B = lA (1 + αAᐃT) - lB (1 + αBᐃT) lA - lB
⇒ lAαA = lBαB

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