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Q.

If a bimetallic strip is heated, it will

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a

twist itself into a helix

b

bend towards the metal with lower thermal expansion coefficient

c

bend towards the metal with higher thermal expansion coefficient

d

not bend at all

answer is A.

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Detailed Solution

Question Image

Clearly, rod with greater α is the rod II, so bimetallic strip has bent towards metal with smaller α. Had α for rod I been greater than, strip would have bend as shown.

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If a bimetallic strip is heated, it will