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Fun with Magnets

Magnet- an introduction

A visit to the junkyard

In a junkyard, there are many materials that can be recycled. First, the materials that are to be recycled have to be separated from the materials that cannot be recycled. This is usually done by using cranes. A crane has a large magnet at the end of its long mechanical arm. This is used to separate materials made up of iron from the rest of the junk. How can the crane separate materials made up of iron so easily?

All materials can be classified into two categories based on their behaviour towards a magnet.

Materials that get attracted toward magnets are known as magnetic materials.

Materials that do not get attracted toward magnet are known as non-magnetic materials.

Iron balls, nails, and coins are made up of magnetic materials as they are attracted toward magnets. Plastic scales, leather shoes, and candles are made up of non-magnetic materials as they are not attracted toward magnets.

Shamsher is a carpenter. One day, he accidentally drops some iron nails in a heap of wooden shavings. How can he easily separate the nails from the wooden shavings?

The magnet attached at the end of the mechanical arm of a crane is used to separate magnetic materials, i.e., those made up of iron, from the rest of the junk.

The given table lists some common materials/objects as magnetic and non-magnetic.

...

Material/Object

Is it attracted by a magnet?

Magnetic or non-magnetic

Iron nail

Yes

Magnetic

Plastic scale

No

Non-magnetic

Wooden block

No

Non-magnetic

Paper

No

Non-magnetic

Glass

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