22.1 Magnets

22.1 Magnets

• Magnets are found in all electric motors with uses as diverse as starting cars and moving elevators.

• Magnetic fields can be used in generators to produce hydroelectric power or bicycle lights.
• Magnets are used to separate iron from other refuse.
• Hundreds of millions of dollars are spent each year on magnetic containment of fusion as a future energy source.
• Magnetic resonance imager (MRI) has become an important diagnostic tool in the field of medicine, and the use of magnetism to explore brain activity is a subject of contemporary research and development.
• Computer hard drives, tape recording, and levitation of high-speed trains are some of the applications on the list.
• The Van Allen belts have charged particles trapped in them.

• All of these phenomena are linked by a small number of underlying physical principles.

• iPods would not be possible without a deep understanding of magnetism.

• There are different shapes, sizes, and strengths of magnets.
• All of them have a north and a south pole.
• A monopole is not an isolated pole.

• Iron can be attracted by magnets in a refrigerator door.
• Magnets can attract or repel other magnets.

• Experiments show that magnets have two poles.
• One pole will point to the north if it is freely suspended.

• It is a universal characteristic of all magnets that repel poles.

• It is not possible to separate the north and south poles in the way that + and - charges can be separated.

• There is a thread that points toward the north.
• The two poles of the magnet are labeled N and S.

• The magnetic pole that is near the North Pole has been wrongly referred to as the "North Pole".
• The north magnetic pole should be called the south magnetic pole.

• Unlike poles, poles repel.