How resistence of insulator affected after increase the temperature
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Although the resistance of a conductor changes with the size of the conductor (e.g. thicker wires have less resistance to current flow than thinner wires), the resistance of a conductor also changes with changing temperature. ... INSULATORS however are liable to DECREASE their resistance with an increase in temperature.
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with increase in temperature , the resistance of conductor increase, but in case of insulator there is a large energy gap between the two bands, so if the temperature rise is heigh the electron will go to upper band so the resistance of insulator affected after increase the temperature
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