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# Magnetic Poles Definition

Magnetic poles are the opposite points on a magnet where magnetic field lines converge or diverge. For example, north and south poles attract each other.

Grades 6-8 VideoElectric & Magnetic Fields
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## Electric & Magnetic Fields

### Fun Facts

• Iron filings become magnetized, and their poles align with the lines of the magnetic fields.
• All magnets have two poles, a north pole where the magnetic field lines diverge and a south pole where these lines converge.
• Like poles of two magnets repel each other and opposite poles attract each other.

### Why Do We Need To Know About Magnetic Poles

Learning about magnetic poles helps us understand how tools like compasses help people find their way. This is because the needle in a compass acts like a tiny magnet that lines up with Earth’s magnetic field. This is very important for jobs in mapping and sailing.

This knowledge is not only useful for navigation but also helps in many other areas like building planes, creating new materials, and making speakers work. For example, knowing about magnetic poles helps invent things like fast-moving planes without needing engines in the same way cars do, or making speakers that can produce sound. This shows how magnetic poles are important in a lot of different jobs.

How can you increase the strength of the magnetic force on an object like a paper clip?
Magnetic forces get stronger as the magnet moves closer to the object it is attracting or repelling. If two magnets are made of the same material, then the larger magnet will have a stronger magnetic field. The strength of a magnet also depends on the material from which it is made. For example, neodymium magnets will have a stronger magnetic field than magnets made from Alnico (an alloy of aluminum, nickel, and cobalt).
Why can iron filings be used to visualize a magnetic field?
Each tiny piece of iron becomes magnetized, and its poles align with the lines of the magnetic field. Therefore, the iron filings will line up to show the field lines and can be used to determine the relative strength of the field. Closely packed lines indicate a stronger field; widely spaced lines indicate a weaker field.
How can two balloons repel each other without touching?
Balloons that have been rubbed with the same material will take on the same charge. Charged objects are surrounded by electric fields that can exert a force on other charged objects. Two balloons with the same charge will repel each other.
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