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A bimetal strip is made out of copper and steel. How do you construct it so that it bends upward when heated up? Select answer

A bimetal strip is made out of copper and steel. How do you construct it so that it bends upward when heated up?

Select answer from the options below

Copper on top, steel on bottom.

Sandwiched with copper on top and bottom and steel in the middle.

Steel on top, copper on bottom.

Doesn't matter, because of the different expansion coefficients, the two metals cannot stick together.

Sandwiched with steel on top and bottom and copper in the middle.

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