10P7 Magnetism

How will like poles (north & north or south & south) behave when they interact?

They will repel and push away from each other

How will opposite poles (north & south or south & north) behave when they interact?

They will attract and pull towards each other

On a magnet, where is the magnetic field strongest?

at the poles

How can you tell where the strongest parts of a magnet are?

The closeness of the lines tells you the strength of the magnetic field

The strongest parts of the magnet are at the poles

Is the magnetic force a contact or a non-contact force?

Non-contact

What is a permanent magnet?

A magnet that produces its own magnetic field

What is an induced magnet?

A material that becomes magnetic when it is placed in a magnetic field

What is the difference between a permanent and an induced magnet?

A permanent magnet always has a magnetic field, but an induced magnet only becomes magnetic when it is placed into a magnetic field

What is a magnetic field?

The region of space where a magnetic force will act on a magnet or a magnetic material

What are the four types of magnetic material?

Iron

nickel

cobalt

steel

Is the force between a magnet and a magnetic material attractive or repulsive?

Attractive

What shape is the magnetic field around a bar magnet?

Many loops going from the North pole to the South pole

In which direction should magnetic field lines point?

towards the south pole of the magnet

What is a magnetic compass? (2)

A small bar magnet mounted on a pin so that it can spin around

It will point in the direction of a nearby magnetic field

Is the magnetic field around the Earth permanent or induced?

Permanent

What does the strength of a magnetic field depend on?

The strength of the magnet AND the distance from the magnet

What is a solenoid?

A coil of current-carrying wire

What is an electromagnet?

A solenoid (coil of current-carrying wire) with an iron core

What is the shape of the magnetic field around a wire?

Circular field lines around the wire

What is the shape of the magnetic field around an electromagnet?

Similar shape to the field around a bar magnet: many loops going from one end to the other end

How can a magnetic field be produced around a metal wire?

When current flows through the wire

What does the strength of a magnetic field around a wire depend on?

The size of the current in the wire AND the distance from the magnet

Why do opposite charges attract while like charges repel?

The magnetic field lines on opposite charges line up meaning they attract

The magnetic field lines on like charges don’t align meaning they repel