Permanent and induced magnets

What is a permanent magnet?

A permanent magnet is a material that produces its own magnetic field, such as iron, cobalt, or nickel.

How is a magnetic field created?

A magnetic field is created by moving charges or by the intrinsic properties of certain materials (e.g., permanent magnets).

What is an induced magnet?

An induced magnet is a material that becomes magnetic when placed in a magnetic field but loses its magnetism once removed.

How can you induce magnetism in a material?

By placing a material (like iron) in a magnetic field or rubbing it with a permanent magnet.

What is the difference between permanent and induced magnets?

Permanent magnets retain their magnetism, while induced magnets only become magnetic when exposed to a magnetic field.

How does the strength of an induced magnet compare to that of a permanent magnet?

The strength of an induced magnet is usually weaker than that of a permanent magnet.

Can an induced magnet lose its magnetism?

Yes, once removed from the magnetic field, an induced magnet typically loses its magnetism.

What is the magnetic field of a magnet made up of?

The magnetic field is made up of invisible lines that flow from the north pole to the south pole.

What happens when like poles of two magnets are brought together?

Like poles (north-north or south-south) repel each other.

What happens when opposite poles of two magnets are brought together?

Opposite poles (north-south) attract each other.

How can you demagnetize a material?

By heating it, hammering it, or by placing it in a strong alternating magnetic field.

How can you visualize the magnetic field of a magnet?

By using iron filings or a compass to trace the field lines around the magnet.

What is the Earth's magnetic field?

The Earth's magnetic field is generated by the movement of molten iron in the Earth's outer core, creating a dipole field.

How does a compass work?

A compass needle aligns itself with the Earth's magnetic field, pointing to magnetic north.

What are some common uses of permanent magnets?

Permanent magnets are used in motors, speakers, compasses, and magnetic storage devices.