Question

Two identical rectangular strips one of copper and other of steel are riveted together to form a bimetallic strip (α_copper  >  α_steel). On heating this strip will

(1) Remains straight

(2) Bend with copper on convex side

(3) Bend with steel on convex side

(4) Get twisted

Answer 1

Correct Answer is: (2) Bend with copper on convex side

When a bimetallic strip of different metals is heated, the strip bends due to unequal linear expansion of the two metals. The strip will bend with metal of greater α on the convex side i.e. outer side.