A student took an iron rod and a wooden rod and wrapped each of them in a piece of paper. These rods were then heated as shown. It was found that the paper around the iron rod does not burn whereas the one around the wooden rod catches fire. It is because,
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(A) Candle, in case of iron rod, is nearer to the paper
(B) Wood being a bad conductor of heat, takes away all the heat
(C) Iron being a good conductor of heat, conducts away the heat given to the paper
(D) Paper, in first case is thicker
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Iron being a good conductor of heat, conducts away the heat given to the paper
Option (C) is correct.
Explanation:
The image is attached.
Since iron is a good conductor of heat, the heat given to the paper wrapped around iron readily gets transferred to the iron rod.
On the other hand, wood is a bad conductor of heat, therefore, the heat in this case does not get transfer to the wood and the paper starts burning.
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(c) Iron being a good conductor of heat conducts always the heart given to the paper
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