Key Terms

Prepared by: learnloophq@gmail.com

Last edited 26 days ago by Learn LoopHQ.

Chapter: 07. Magnetism

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Magnetism: An invisible force that pulls certain substances towards a magnet.

Magnet: Any substance that has the property of attracting iron and other materials such as steel, cobalt and nickel.

Natural magnet: A magnet which occurs naturally and has the ability to attract magnetic materials.

Artificial magnet: A magnet in which the magnetic properties are imparted artificially.

Bar magnet: A long rectangular magnet, commonly used in everyday life.

Horseshoe magnet: A magnet bent in U shape, making its poles stronger by pointing them in the same direction.

Cylindrical magnet: A magnet designed and constructed in the form of a long cylinder.

Magnetic substances: Substances that are attracted by a magnet.

Non-magnetic substances: Substances which are not attracted by magnets.

Poles: The two ends of a magnet where its attractive property is maximum.

North pole (of a magnet): The end of a freely suspended bar magnet which points towards the geographic north.

South pole (of a magnet): The end of a freely suspended bar magnet which points towards the geographic south.

Magnetic axis: The imaginary line joining the two poles of a magnet.

Magnetic field: The region around the magnet where its magnetic influence can be felt.

Magnetic lines of force: The imaginary curved lines representing the magnetic field of a magnet.

Magnetisation: The process by which a magnetic material attains magnetism temporarily or permanently.

Magnetic induction: The phenomenon by which an ordinary piece of iron acquires magnetic properties temporarily, due to the presence of another magnet near it.

Single touch method: The method of magnetising a magnetic material by rubbing a single bar magnet against it.

Double touch method: The method of magnetising a magnetic material by rubbing two bar magnets against it.

Electromagnet: A soft-iron core that gets magnetised when an electric current is passed through a coil of wire wound around it.

Permanent magnet: A magnet whose magnetic properties are permanent and has fixed north and south poles.

Temporary magnet: A magnet whose magnetic properties are temporary and the position of north and south poles can be changed.

Demagnetisation: The process by which the magnetic properties of a magnet are destroyed.

Magnetic keepers: Pieces of soft iron used to store magnets to avoid self-demagnetisation.

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