Confusing Options!
Classical Mechanics
Level
2
What is special about the property of Mica?
None of these.
It is a good conductor of both, electricity and heat.
It is a good conductor of electricity and bad conductor of heat.
It is a good conductor of heat and bad conductor of electricity.
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1 solution
Mica is a good conductor of heat but an electrical insulator. The electrical and thermal conduction properties of a material can be similar or very different, in metals the electrical and thermal conductivity is due to free electrons, in non-metals thermal conductivity has nothing to do with free electrons, but more to do with lattice vibrations (phonons, NOT photons).
So mica has good thermal conductivity due to phonons, but doesn't have sufficient free electrons to be a good conductor of electricity.