Electromagnetism Video Tutorial Part 2 @ www.ThePhysicsCafe.com

In the fifth century B.C., the Greeks already knew that there are some rocks that attract bits of iron.

And they are very plentiful in the district of Magnesia, and so that's where the name "magnet" and "magnetism" comes from.

In eleven hundred A.D., the Chinese used these needles of magnetite to make compasses, and in the thirteenth century, it was discovered that magnetites have two places of maximum attraction, which we call poles.

So if you take one piece of magnetite, it always has two poles.

Let's call one pole A, and the other B. A and A repel each other, B and B repel each other, but A and B attract each other.


This video explains the relation between electricity and magnetism in the first part. In the second segment, the video explains why a magnetic force is produced in the presence of both current and magnetic field.

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[sergiorenegarcia]

Can you explain when to use the left hand rule and when to use the right hand rule, I don't seem to understand.