Question

A cylindrical metal rod of length $L_0$ is shaped into a ring with a small gap as shown. On heating the system

• A. $x$ decreases, $r$ and $d$ increase
• B. $x$ and $r$ increase, $d$ decreases
• C. $x,r$ and $d$ all increase
• D. Data insufficient to arrive at a conclusion

Answer 1

Answer: (C)

On heating the system; $x,r$ and $d$ all increase, since the expansion of isotropic solids is similar to true photographic enlargement.