Answer:
Electric bell consists of an iron hammer around which a wire is wound. When current is passed by pressing the button, the wire turns into a temporary magnet. The hammer is attracted towards going to make sound. When this strikes, the current is disconnected automatically. It happens due to shift arrangement in it. The magnetic property of wire is lost and it comes back to its original position through a spring. In this way, we get repeated hammering, resulting in ringing of an electric bell. 
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