Electromagnet: 1 Mark
Uses: 1 Mark
An electromagnet is a magnet that runs on electricity. Unlike a permanent magnet, the strength of an electromagnet can easily be changed by changing the amount of electric current that flows through it. The poles of an electromagnet can even be reversed by reversing the flow of electricity. Electromagnets are very strong magnets and they are used in lifting heavy materials like in cranes. They are found in generators, motors and a lot of electronic devices.

The two extreme ends of the bar magnet represent its two poles.

Yes or No: 1 Mark
Reasons: 4 Marks
Yes, magnets can lose their magnetic property.
Magnets lose their properties if they are heated, hammered or dropped from some height. Take care to protect the magnets against mechanical shock. Some magnets are brittle. They will crack or break if they fall on a hard surface or bang against metal or another magnet. Do not strike them with a hammer.  Also, magnets become weak if they are not stored properly. To keep them safe, bar magnets should be kept in pairs with their unlike poles on the same side.

Magnetic compass: 2 Marks
Use: 1 Mark
The magnetic compass is a device containing a magnetic needle pivoted in a horizontal plane that indicates North when held on the earth's surface.
Use: Magnetic compass is used to find directions. It is used by sailors to find the right direction during navigation.

Classification: 1 Mark
Reason: 2 Marks
Magnetic materials: Steel, iron nails and cobalt are magnetic materials because they get attracted to magnets.

Non-magnetic materials: Rubber, wood, and plastic are non-magnetic materials because they show no effect when a magnet is brought near them.

Each Point: 1 Mark
In N - N, repulsion will occur as like poles repel each other.

In N - S, attraction will occur as unlike poles attract each other.

In S - S, repulsion will occur as like poles repel each other.

A freely suspended magnet always aligns in the North-South direction.