A cylindrical metal rod of length $L_{0}$ is shaped into a ring with a small gap as shown. On heating the system

x decreases, r and d increase

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x and r increase, d decreases

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x, r and d all increase

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Data insufficient to arrive at a conclusion

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Solution

The correct option is C x, r and d all increase
On heating the system; x, r, d all increases, since the expansion of isotropic solids is similar to true photographic enlargement

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