Physics
A photo-electric cell converts

Mechanical energy to electric energy
Light energy to chemical energy
Light energy to electrical energy
Heat energy to mechanical energy

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

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