When a bimetallic strip is heated, it (a) does not bend at...

When a bimetallic strip is heated, it
(a) does not bend at all
(b) gets twisted in the form of an helix
(c) bend in the form of an arc with the more expandable metal outside
(d) bends in the form of an arc with the more expandable metal inside

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Key Concepts

Thermal Expansion

Thermal expansion is the process by which materials increase in size as their temperature rises. This happens because the particles within a material move more vigorously at higher temperatures, causing an increase in the average distance between them. The extent of the expansion is characterized by a material's coefficient of thermal expansion.

Differential Expansion

Differential expansion occurs when two materials with different coefficients of thermal expansion are subjected to the same temperature change. Because each material expands by a different amount, mechanical stresses are induced at the interface between them, which can lead to bending or warping of the composite structure.

Bimetallic Strip Behavior

A bimetallic strip is a device that consists of two metals with differing rates of thermal expansion bonded together. When exposed to heat, the metal with the higher coefficient of thermal expansion expands more than the other, causing the strip to bend into an arc, with the more expansive metal on the outer side of the curve.

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