Balancing compass : Fizzics Education

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# Balancing compass

### You will need:

• A horseshoe magnet (find magnet supplies here)
• Modelling clay or dough
• A sharpened pencil
• A compass
• Optional – a smartphone with a compass app.

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Push the end of a sharpened pencil into a lump of modelling clay or dough and stand it upright on a desk.

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Bring a compass up to the base of the pencil. You should see that the horseshoe magnet has lined up with the same direction that the compass is facing. You’ve found Earth’s magnetic north pole!

You can double-check that compass is not being attracted to the horseshoe magnet by moving it away from the balancing compass you’ve made. If it the compass needle still points in the same northerly direction, you’re ok.

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OPTIONAL – Use a compass app on a smartphone to instead of a traditional compass.

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#### Get the Electricity & Magnetism Unit of Work here!

• How does electricity actually flow?
• What makes magnets become magnetic?
• Why is there electromagnetism and what does this tell us about electricity & magnetism?
• From series & parallel circuits to conductors & insulators, there’s a lot to explore & learn!

Includes cross-curricular teaching ideas, student quizzes, a sample marking rubric, scope & sequences & more.

### What is going on?

The Earth’s outer core is constantly moving, whereby iron-rich molten rock swirls in large eddies. This swirling motion of iron-rich molten rock acts as a geodynamo, creating electric currents that produce the Earth’s magnetic field. This dynamic magnetic field extends out into space and is constantly moving due to motion of the outer core (as well as other interactions with sources of magnetism throughout the Earth’s interior and in the Earth’s atmosphere). As such, the magnetic north of the Earth is always moving and is not aligned with north on a map.

Your horseshoe magnet lined up with Earth’ magnetic north pole!

### Variables to test

• Does the size of the horseshoe magnet matter?
• What if you vary how you suspend the magnet?

More on variable testing here