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If a cylinder of diameter 1.0 cm at 30°C is to be solid into a hole of diameter 0.9997 cm in a steel plate at the same temperature, then minimum required rise in the temperature of the plate is : (Coefficient of linear expansion of steel C     / 10 12 6 )

1. 25°C
2. 35°C
3. 45°C
4. 55°C

Correct answer: 25°C

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