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Magnetism

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Title
Materials
Difficulty
Safety

Build a Simple Speaker

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A speaker is build from a coil of wire, a strong magnet and other simple materials, or even just a coil of foil on cardboard and a magnet.

Diamagnetic Levitating Magnet

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Bismuth is melted into discs, these are set up with neodymium magnets to make one of the magnets levitate. Doesn't require superconductors.

Ferrofluid

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A variety of demonstrations show the properties of Ferrofluid.

Franklin's Bells

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A bell or can is connected to a high voltage power source, another to ground. A ball of metal moves between them as it alternates its charge.

Gauss Rifle/Gun

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Neodymium magnets and ball bearings are arranged in a line, rolling another ball bearing in causes other to shoot away.

Lenz's Law - Magnet Down Metal Tube

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A neodymium magnet is dropped down a copper or aluminium tube, its fall is slowed because of Lenz's law - it induces a magnetic field.

Listening to Magnetism

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A coil of wire is connected to an amplifier with a speaker. Moving a magnet past the coil induces a current which can be heard.

Magnetic Heat Engine

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Nickel is suspended from a pendulum, and attracted by a strong magnet. Heating the nickel with a candle causes it to lose its magnetism and swing.

Magnetic Slime / Silly Putty

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Slime or silly putty is made and iron filings, iron oxide powder or photocopier toner is added. It will then be attracted to a neodymium magnet.

Making a Magnetic Compass

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A compass can be made by magnetising a needle with a magnet. It can then be floated on water to move.

Making Ferrofluid

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Ferrofluid (fluid that is magnetised by a magnetic field) can be made from a variety of materials.

Simple Electromagnet

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Insulated wire is wrapped around an iron rod or nail and connected to a battery, making an electromagnet which can be used to pick up iron objects.

Simplest Electric Motor

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A very simple electric motor is made from a battery, magnet and paper clip. Other versions use coiled insulated copper wire.