Physics
Mica is used in electrical appliances such as electric iron because mica is

a good conductor of heat but a bad conductor of electricity
a bad conductor of heat as well as electricity
a good conductor of heat as well as electricity
a bad conductor of heat but a good conductor of electricity

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Physics
The law of conservation of energy states that

Energy can neither be created or destroyed
Energy can either be created nor destroyed
Energy can either be created or destroyed
Energy can neither be created nor destroyed

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