Figure shows the action of a switch by a bimetallic strip. If α1 and α2 are coefficients of thermal expansion of metal 1 and metal 2 respectively.

Engineering

Physics

Thermal Expansion

Question

Figure shows the action of a switch by a bimetallic strip. If α₁ and α₂ are coefficients of thermal expansion of metal 1 and metal 2 respectively.

α₁ > α₂

None of these

α₁ > α₂ if the current in circuit is clockwise

α₁ < α₂

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In a bimetallic strip, whichever strips has less ‘α’ the combination bends towards it, so that, the less α strip forms the inner radius of the curve hence has length less.
Hence for given situation to be free α₁ < α₂.

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