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A bimetallic strip is made of aluminium and steel (αAl>αsteel). On heating, the strip will  [NCERT Exemplar]

a
remains straight
b
get twisted
c
will bend with aluminium on concave side
d
will bend with steel on concave side

detailed solution

Correct option is D

As αAl>αsteel, aluminium will expand more. So, it should have larger radius of curvature. Hence, aluminium will be on convex side and steel on concave side.

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