Listen NCERT Audio Books - Kitabein Ab Bolengi
Core of an electromagnet must be of soft iron but not steel. Justify it.
The soft iron inside the coil makes the magnetic field
Stronger because it becomes a magnet itself when the current is flowing. That is, Soft iron is said to form a temporary magnet. In this way, the electromagnet can be switched on and off by turning the electricity on and off.