A bimetallic strip is made of two strips A and B having coefficient of linear expansion as α A and da. If α Aα B, which one of the following describes the behaviour of the metallic strip when heated?

Question

A bimetallic strip is made of two strips A and B having coefficient of linear expansion as α A and da. If α A>α B, which one of the following describes the behaviour of the metallic strip when heated? (A) Strip will bend only when (α A+α B/2)>(α A-α B)  (B) Strip will bend but will not elongate (C) Strip will bend with metal A as the outer side (D) Strip will bend with metal B as The outer side

Tardigrade Admin · Accepted Answer

As α A is more than α 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.

Q. A bimetallic strip is made of two strips $A$ and $B$ having coefficient of linear expansion as $α_{A}$ and da. If $α_{A} > α_{B},$ which one of the following describes the behaviour of the metallic strip when heated?

Strip will bend only when $\frac{α _{A} + α _{B}}{2} > (α_{A} - α_{B})$

Strip will bend but will not elongate

Strip will bend with metal A as the outer side

Strip will bend with metal B as The outer side

As $α_{A}$ is more than $α_{B}$ 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.

Q. A bimetallic strip is made of two strips A and B having coefficient of linear expansion as αA​ and da. If αA​>αB​, which one of the following describes the behaviour of the metallic strip when heated?

Strip will bend only when 2αA​+αB​​>(αA​−αB​)