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An indicator is a chemical compound that changes its colour in presence of an acid or base. Indicators are generally derived from plant pigments and are mildly acidic or basic in nature.
An inductor is a passive electronic component with two terminals. It is mainly made of a coiled insulated wire. An inductor is typically used to store energy in a magnetic field when current travels through it. The variation in the current is resisted with the use of an inductor.