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AP EAMCET202123 Aug 2021Morning ShiftPhysicsThermal Properties of MatterActual

A bimetallic strip is made of aluminium and steel ( _ Al > _ steel ) . On heating, the strip will

Options

  1. Aremain straight
  2. Bget twisted
  3. Cbend with aluminium on concave side
  4. Dbend with steel on concave side

Correct answer

B. get twisted

Step-by-step solution

As we know that, array rlrl l & =l₀ T & & = l l₀ T array where, l is change in length, l₀ is initial length, T is change in temperature and is coefficient of linear expansion. Now, array ll & _ Al > _ stecl & l_ Al > l_ stecl array That means aluminium expands more than steel.

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