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How Magnets Work- mini lecture #1

ggilson07

Created on June 27, 2016

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Transcript

MAGNETO

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How Magnets Work

No you, probably won't become Mangeto after this.

Refrigerator Magnets Experiment

You need a parnter. Grab at least two fridge magnets, a metal spoon, and a plastic spoon. Answer the following:

1. Will the magnets stick if you turn them over? 2. Why do they stick to the refrigerator door? 3. What can you say about the magnetic properties of the door next to the magnet? 4. Do refrigerator magnets stick to metal or plastic spoons? 6. Do they stick to all types of metal?

This will cover...

1. The poles of a magnet

I1. Repulsion (like poles) and attraction (unlike poles)

II1. Misconception of the Earth’s polarity in relation to a magnet or compass

1V. Splitting up magnets results in more magnets

The Poles of a Magnet

1.Experimentation shows that magnets have two poles (dipolar) 2.If freely suspended, one pole will point toward the north 3.The two poles are named the north magnetic pole and the south magnetic pole

Opposites Attract

It is a universal characteristic of all magnets that like poles repel and unlike poles attract. Further experimentation shows that it is impossible to separate north and south poles in the manner that + and − charges can be separated.

Dipolar Bar Magnets

MISCONCEPTION ALERT:

The Earth acts like a very large bar magnet with its south-seeking pole near the geographic North Pole. That is why the north pole of your compass is attracted toward the geographic north pole of the Earth—because the magnetic pole that is near the geographic North Pole is actually a south magnetic pole! Confusion arises because the geographic term “North Pole” has come to be used (incorrectly) for the magnetic pole that is near the North Pole. Thus, “North magnetic pole” is actually a misnomer—it should be called the South magnetic pole.

Inseparable Poles

North and south poles always occur in pairs. Attempts to separate them result in more pairs of poles. If we continue to split the magnet, we will eventually get down to an iron atom with a north pole and a south pole—these, too, cannot be separated.