When the electric current flowing through an iron bar is stopped, it becomes a permanent magnet.
When an electic current is passed through any wire, a magnetic field is produced around it . Then why an electric iron connecting cable does not attract nearby iron objects when electric current is switched on through it ?
In an electric bell, when the electromagnet pulls the iron strip, it also breaks the circuit. The current through the coil stops flowing. In this case, will the coil remain an electromagnet? How does an electric bell ring then?
An iron bar becomes a bar magnet when one of the poles of a bar magnet is rubbed on it several times. This is known as____________.