Why mica is a good conductor of heat but an insulator for electricity?

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Solution

Dear student,
Mica is a good conductor of heat but an electrical insulator. According to free electron theory (which applies only to metals) free electrons carry heat and electricity. Therefore, thermal conductivity is directly proportional electrical conductivity.
Mica is therefore extensively used in heating elements, irons and even as insulation between live parts and heat sinks.
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