Saket was repairing an electric bell. By mistake, instead of an electromagnet, he placed a permanent magnet in the electric bell. Explain, what changes do you observe.

Explanation

Electromagnets are used in electric bells. When current passes through the coil, the electromagnet attracts a metallic plate. The hammer attached to this metallic plate hits the gong and produces sound. When the plate is attracted by the electromagnet, it breaks the circuit and the electromagnet stops working as a magnet and after hitting the gong, the plate retains its contact with contact screw. Instead of an electromagnet, if we use a normal magnet, the metallic plate cannot regain its original contact.