Physics
During washing of clothes, we use indigo due to its

High glorious nature
Proper pigmental composition
Better cleaning action
Very low cost

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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 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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