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Concepts Of Physics MCQ Edition [Volume 2]PhysicsHeat and Temperature

A bimetallic strip is created by rivetting together two identical rectangular strips, one of copper and one of steel ( _ copper > _ steel ). Upon heating, this bimetallic strip will

Options

  1. Abend with copper on the convex side
  2. Bbend with steel on the convex side
  3. Cundergo twisting
  4. Dremain straight

Correct answer

A. bend with copper on the convex side

Step-by-step solution

When the bimetallic strip is heated, both the copper and steel strips expand. The increase in length is given by L = L₀ T . Since the coefficient of linear expansion of copper is greater than that of steel ( _ copper > _ steel ), the copper strip expands more than the steel strip. To accommodate the unequal expansion while remaining riveted together, the bimetallic strip bends. The strip with the greater expansion (copper) will form the outer curve, which has a larger radius and greater length. Thus, the bimetallic

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