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Question
If a bimetallic strip of iron and and copper is heated , then it will
If a bimetallic strip of iron and and copper is heated , then it will
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Solution
The correct option is B bend with copper strip at convex side
A bimetallic strip is used to convert a temperature change into mechanical displacement.The strip consists of two layers, usually iron and copper. The two layers are joined together to form the strip owing to the difference in the constants of expansion of the two materials, a flat strip will bend one way (toward the iron part) if heated. The linear thermal expansion coefficient relates the change in temperature to the change in a material's linear dimensions it is the fractional change in length of a bar per degree of temperature change.The copper has thermal expansion coefficient value 17×10−5/oC and iron 12×10−5/oC. When heated copper expands more than iron, so the strip is bended into the iron's way.
A bimetallic strip is used to convert a temperature change into mechanical displacement.
The strip consists of two layers, usually iron and copper. The two layers are joined together to form the strip owing to the difference in the constants of expansion of the two materials, a flat strip will bend one way (toward the iron part) if heated. The linear thermal expansion coefficient relates the change in temperature to the change in a material's linear dimensions it is the fractional change in length of a bar per degree of temperature change.
The copper has thermal expansion coefficient value 17×10−5/oC and iron 12×10−5/oC. When heated copper expands more than iron, so the strip is bended into the iron's way.
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