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Question

# A metal 1 of solid section is encased in a metal 2 tube as shown is diagram . This composite bar is cooled by 500 C, then α1>α2.

A
Both metal will be in tension
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B
Both metal will be in compression
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C
Metal 1 will be in tension, metal 2 will be in compression
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D
Metal 2 will be in tension, metal 1 will be in compression
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Solution

## The correct option is C Metal 1 will be in tension, metal 2 will be in compression As α1>α2, metal 1 undergoes more shortening then metal 2 due to decrease in temperature. To make up for this differential change in length, metal 1 is in tension and metal 2 is in compression.

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