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Question

A thin metal rod of length L0 is shaped into a ring with a small gap x as shown. On heating the system

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

The correct option is C x, r and d all increase
Heating of the any material must be visualized as photographic expansion of the object, that is, we take a picture of the object and then zoom it. In such an expansion, distance between any two points in the material increases.

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