A long metal rod is bent to form a ring ...

A long metal rod is bent to form a ring with a small gap if this is heated, will this gap increase or decrease?

x decreases, r and d increase

x and r increase, d decrease

x,r and d all increases

Data insufficient to arrive at a conclusion

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The correct Answer is:

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

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