It's a paperclip compass.

Compass.

In other words, the field of the magnet is near the pigeon's head.

The magnets, of course, have a magnetic field around them.

Distance also plays a role. Think back to playing with a magnet.

JH Now is this electromagnetic here, or are these static?

We have to generate an electromagnetic field...

I need a compass.

The light in this case is created through where the plasmatic magnetic field of the magnetosphere of the...

Compass needles point to the north.

This is a large pulley made by sandwiching rubber between two old CDs.

No compass?

A magnet attracts iron.

This is a horseshoe magnet.

JH I agree.

There is no burning of the fuel in the centre of the planet.

And the closer they are, the stronger the attraction.

Whenever current flows through the coil, this becomes an electromagnet.

You can see, this is the generator. It's a crank generator.

What happens?

The lines of this field run between magnetic north and magnetic south at the two poles.

Charles Walcot investigated the magnetic compass bearing sense in pigeons.

This is a picture about a year ago.

I have here a superconductor, which I wrapped up so it'd stay cold long enough.

It includes 330 compasses.

The magnetite is attracted to the earth's magnetic field.

If we didn't have the energy from thorium, we wouldn't have carbon recycling in the crust.

Except there is a slight tether here, which keeps it from going over the top of its field.

And that's what it is.

And this is a very widespread phenomena.

If I spin this pulley, the small one's going to spin much faster.

Therefore it has a smaller gravitational pull on the astronaut.

Now this is important for two reasons.

I've got some pieces of notebook paper folded up into a rough Z shape.

It's a remarkable effect. It's very strong.

Magnetic Pole

If you float a one yen coin on water and move a magnet slowly towards it then the coin will approach the magnet.

Keeton put magnets on the heads of his pigeons.

The magnets on their heads were responsible for that.

Maybe one more thing might help. Have you ever played with two magnets?

You know, the magnets with the north and the south poles?

This is a permanent magnet.

Magnetic Moment

Electromagnetism

Electromagnetic pulse.