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

The correct option is C

$x$, $r$ and $d$ all increase

No matter how detailed this question looks, the simple answer is - everything within an object will expand, if the object itself expands. On heating, $x$, $r$ and $d$ must all increase.