Magnetism was discovered about 4000 years back in ancient Greece.
Some items such as iron and nickel get attracted to magnets and are called magnetic materials. Items that do not get attracted to magnets are called non-magnetic materials.
Have you ever wondered why a magnet attracts certain materials and what is the range where its influence can be experienced? The region around a magnet where its influence is felt is called the magnetic field of the magnet. We cannot see the magnetic field, but it is represented by a set of curves around a magnet called magnetic field lines or magnetic lines of force.
Earth behaves like a huge magnet with its north pole near the geographic south pole and its south pole near geographic North pole. This is why a freely suspended magnet comes to rest in the North - South direction. The North pole of the suspended magnet is attracted by the south pole of earth's magnet, and hence points to the geographic north.
Revise the 4 basic properties of a bar magnet:
Understand the relationship between electricity and magnet and study the interesting phenomenon of electromagnetism. Understand Fleming's left and right hand rules and learn to apply them in different situations.
A SmartTest on Magnetic Effects of Electric Current
Learnhive Lesson on Uniform and Non-uniform magnetic Field
Learnhive Lesson on Bar Magnet and Solenoid
Learnhive Lesson on Magnetic field due to Circular Coil
Learnhive Lesson on Lens Law
Learnhive Lesson on Flemings Right Hand Rule
Learnhive Lesson on Faradays Laws
Learnhive Lesson on Difference between AC and DC
Learnhive Lesson on Advantages of AC over DC