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Magnets and Magnetism
By Albert Zhang download (Magnetism is a…
Magnets and Magnetism
By Albert Zhang 
Magnetism is a fundamental property of matter. Some metals and rocks found in nature are naturally magnetic.
Permanent magnets retain magnetic properties for a long time. Bar magnets and horseshoe magnets are examples of permanent magnets.
Temporary magnets only retain their magnetic properties for a short time. You can make temporary magnets by rubbing a permanent magnet against a piece of metal.
Force of attraction between opposite poles
north pole attracted to south pole, and vice versa
Force of repulsion between like poles
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All magnets must have 2 poles (north and south). Even if a magnet is cut in half, it will just create two magnets, each with two poles.
Magnetic field lines are continuous and flow from the north pole to south pole.
If there are more magnetic field lines clumped together, that means that the magnetic field is more intense there.
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Earth also has a magnetic field. Earth's magnetic north pole is at the geographic South pole, and vice versa
Force on a charged particle due to a magnetic field is F = qvBsin(theta). The force is also equal to the cross product of the velocity vector and magnetic field vector.
The direction of the magnetic force is determined using the Right Hand Rule.
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Earth's magnetic poles move slightly every year and with switch places roughly every 200,000 to 300,000 years. This is called geomagnetic reversal.
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