Maharashtra State PSC Model Paper 1

The Correct Answer is Magnetic effect of current.

• Electric bell works on the principle of electromagnetism.
• The circuit of an electric bell consists of a coil of wire wound on an iron piece.
• The coil act like an electromagnet.
• An iron strip with a hammer at one end is kept close to the electromagnet.
• There is a contact screw near the iron strip.
• When the iron strip is in contact with the screw, the current flows through the coil which becomes an electromagnet.
• The hammer at the end of the strip strikes the gong of the bell to produce a sound.
• When the electromagnet pulls the iron strip, it also breaks the circuit, and the current through the coil stops flowing.
• The coil is no longer an electromagnet once the current through it stops flowing.
• The circuit completes when the iron strip comes back to its original position and touches the contact screw again.