- Properties Of Magnets
- Induced Magnetism & Electrical Method Of Magnetisation (You Are Here!)
- Magnetic Field and Magnetic Field Lines
- Temporary and Permanent Magnets
- Magnetic Field Due To Current In A Straight Wire
- Magnetic Field Due To Current In A Solenoid
- Electric Bell
- Circuit Breaker
- Force On Current-carrying Conductor
- Fleming’s Left-hand Rule
- Workings of D.C. Motor
- Principles of Electromagnetic Induction
- A.C. Generator
- Workings of A Transformer
Magnetic Induction is one of the ways making magnetic materials like steel and iron into magnets. In other words, magnetic induction is a process of inducing magnetism in an ordinary piece of magnetic material.
- This method involves simply placing the magnetic material (soft iron) close to a strong magnet without touching.
- The soft iron bar becomes an induced magnet with the end nearer the magnet having opposite polarity to that of the magnet.
- Hence, the soft iron bar is attracted and attached to the permanent magnet. Magnetic induction process reveals how magnetic materials can be attracted to magnets.
- Induced magnetism is a temporary process. If the permanent magnet is removed, the magnetic material will usually lose its induced magnetism.
Electrical method for magnetisation
For magnetization, a direct current flowing into a solenoid (a long insulated wire coiled into a cylinder) produces a magnetic field that, inside the coil, is uniform in strength and direction.
- The solenoid becomes a magnet.
A steel bar placed inside the coil for a short while becomes magnetised due to magnetic induction from the solenoid.
- The polarities of the magnet depend on the direction of current flow.
Magnetisation by electric current method creates more powerful magnets than other magnetization methods such as stroking.