Why does the following: A bimetallic rod when heated, undergoes a change of form

Question

Why does the following: A bimetallic rod when heated, undergoes a change of form ...answer Because the two metals forming part of the rod have different linear expansion coefficients, and the largest value to the lowest curve Because the two metals forming part of the rod have different linear expansion coefficients, and the lowest curve to the highest value Because the two metals forming part of the rod have similar linear expansion coefficients..Because the two metals forming part of the rod have the same linear expansion coefficients.

Explanation / Answer

b.
Because the two metals forming part of the rod have different linearexpansion coefficients, and the lowest curve to the highest value

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