A copper rod of length l 0 at 0 o C is placed on a smooth surface. Now the rod is heated up to 100 o C . Find the longitudinal strain developed ( α = coefficient of linear expansion)

Question

A copper rod of length l 0 at 0 o C is placed on a smooth surface. Now the rod is heated up to 100 o C . Find the longitudinal strain developed ( α = coefficient of linear expansion), 100 - α l 0 + 100 l 0 α, 100 α, Zero, None of these

MARKS App · Accepted Answer

Since, the surface is smooth, so no stress is developed inside the rod. Hence, strain is zero, Mathematically, Y × s t r a i n = s t r e s s = Y × 0 = 0

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