A bimetallic strip is made of aluminium and steel (αAl > αsteel). On heating, the strip will a) remain straight b) get twisted c) will bend with aluminium on the concave side d) will bend with steel on the concave side
Since αAL>αsteel , so on heating the bimetallic strip, aluminium strip will expand more than that of steel strip. Due to it, steel strip will bend on concave side
