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If the ratio of coefficient of thermal conductivity of silver and copper is 10 : 9, then the ratio of the lengths upto which wax will melt in Ingen Hausz experiment will be

1. 6 : 10
2. 3 : 10
3. 100 : 81
4. 81 : 100 PG #4

Correct answer: 3 : 10

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