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Name the substance whose resistanc almost remain unchange by increase of temperature

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There can be many substances whose resistance remains almost unchanged by increase of temperature. Materials such as wood and air can be the ones, which has a high electric resistance and it changes rarely with the increase in temperature. Apart from this there are some metal alloys whose resistance remains almost unchanged
Any insulator material like wood etc. They have very high resistance and that rarely changes with increase in temperature.
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