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Q.

Mica sheets are used to provide structure for heating wire because:

 A.

It is a bad conductor of heat as well as electricity

 B.

It is a bad conductor of heat but a good conductor of electricity

 C.

it is a good electrical insulator at the same time as being a good thermal conductor

 D.

It is a good conductor of heat as well as electricity

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Solution:
Option(C) is correct

Mica sheets are used to provide structure for heating wire in heating elements and can withstand up to 900 °C.

Sheet mica is used principally in the electronic and electrical industries. Its usefulness in these applications is derived from its unique electrical and thermal insulating properties and its mechanical properties, which allow it to be cut, punched, stamped, and machined to close tolerances.

Specifically, mica is unusual in that it is a good electrical insulator at the same time as being a good thermal conductor. The leading use of block mica is as an electrical insulator in electronic equipment


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