Q. A bimetallic strip is made of two strips $A$ and $B$ having coefficient of linear expansion as $ {{\alpha }_{A}} $ and da. If $ {{\alpha }_{A}}>{{\alpha }_{B}}, $ which one of the following describes the behaviour of the metallic strip when heated?
Rajasthan PETRajasthan PET 2012
Solution:
As $ {{\alpha }_{A}} $ is more than $ {{\alpha }_{B}} $ so the length of metal A after rise in temperature will be more than that of metal B. The bimetallic strip will bend in such a manner that metal A will fall on the outer side and B will lie on the inner side of the bent strip.
