North poles

So I was reading along in my physics book… trying to study for a test.

Electromagnetism is not my friend.

One section was explaining how a compass worked.

I kept reading.

A bit later, I was learning about a rule… that when current is flowing through a wire, if you wrap your hand around it with your fingers pointing the way that the magnetic lines are going, then your thumb will be pointing towards the north pole.

Ok.

I kept reading.

Several pages later… I suddenly realized… that they meant the north pole side of the field created by the current…. not the north pole of the earth like the compass from the other section.

This is when you know that it is time to give it up and go to bed.

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