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Two copper rods, A and B, each 2 m long,...

Two copper rods, A and B, each 2 m long, are heated. A is heated from `30^@C` to `50^@C` and the B is heated from `40^@C` to `55^@C`. Which one will elongate more?

A

Both A and B elongate by same amount

B

A will elongate more than B

C

B will elongate more than A

D

Can't say which one

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