The bimetallic strip made up of aluminium and copper, when heated bends in the direction shown below. Which metal expands more when the two are heated at the same temperature?

Aluminium expands more than copper

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Copper expands more than aluminium

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Both aluminium and copper expand by the same amount

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Neither aluminium nor copper expands

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Solution

The correct option is A Aluminium expands more than copper
The outer edge of the curve is longer as aluminium expands more than copper, if both are heated at the same temperature.

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(C u)

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On heating a bimetallic strip made from brass and iron, the brass strip expands more. $(α_{b r a s s} > α_{i r o n})$

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