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At what temperature a gold ring of diameter 6.230 cm be heated so that it can be fitted on a wooden bangle of diameter 6.241 cm? Both the diameters have been measured at room temperature (27°C). (Given: coefficient of linear thermal expansion of gold α L = 1.4 × 10 –5 K –1 )

1. 125.7°C
2. 91.7°C
3. 425.7°C
4. 152.7°C

Correct answer: 152.7°C

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