In an electric bell, the sound is produced when the [[1]] strikes the gong.

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answer is HAMMER.

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Detailed Solution

An electric bell consists of an electromagnet, switch, iron strip, contact screw, hammer and a gong.

When the switch is ON, the circuit gets closed and an electric current is passed through the circuit.
Due to the electric current, the wounded iron coil starts acting as an electromagnet.
This electromagnet pulls the iron strip.
In the process, the hammer at the end of the strip strikes the gong of the bell to produce a sound.

Therefore, 'hammer' is the correct response.

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