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A metal rod is shaped into a ring with a small gap. If this is heated,

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The length of the rod will increase

The gap will increase

The gap will decrease

The diameter of the ring will increase in the same ratio as the length of the rod

answer is A, B, D.

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Detailed Solution

On heating the system; distance between any two points on the body increases. So, x, r, d all increase, since expansion of isotropic solids is similar to true photographic enlargement.

$I = 3.14 d$

the diameter of the ring will increase in the same ratio as the length of the rod.

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