20.1 Understanding Magnetism

Polarity of magnets:

What happens when you bring two South Poles close?

Where do the magnetic field lines start and end?

What happened to the light bulb when we had more loops in the solenoid?

A steady current flows in a straight wire to the right. Choose the correct magnetic field lines around the red point.

A steady current flows in a straight wire.

The direction of the current is suddenly reversed.

What happens to the magnetic field?

A steady current flows in a straight wire.

Gradually, the current in the wire is increased.

What happens to the magnetic field when the current increases?

What do we call the atoms in a magnet that act as tiny magnets?

Individual dipoles tend to clump with other dipoles forming larger dipoles called domains.

These domains have a weaker magnetic fields than individual dipoles

How can we transform a temporary magnet to permanent magnet?

What happens every time we cut a magnet in half?

Which picture illustrates the correct domain alignment of a non-magnet?

How can we create a ferromagnet?