The material used for making the armature of an electric bell is

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aluminum

soft iron

steel

bronze

answer is C.

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Detailed Solution

The material used for the production of electric bell fittings is steel.
An electric bell armature must exhibit magnetic properties only when it is magnetized, otherwise it behaves as a non-magnetic material. This means that the material used to make the armature of an electric bell should magnetize quickly when an electric current passes through them and demagnetize quickly when the electric current stops.
Steel is highly magnetic in nature and demagnetizes quickly. Therefore, steel cannot be used in an electric bell.

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