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Q.

A bimetallic strip is made of aluminium and steel (αAl>α st ) . On heating, the strip will 

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a

get twisted.

b

will bend with aluminium on concave side.

c

will bend with steel on concave side.

d

remain straight.

answer is D.

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Detailed Solution

As  aluminium will expand more. so, it should have larger radius of curvature. Hence, aluminium will be on convex side.

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