Magnetism(Magnets/Permanent/Induced)

Where is the magnetic force strongest on a magnet

At the poles of the magnet

What two poles do magnets have

North and south

What happens when we bring two magnets close together

They exert a force on each other

What are magnets

An object that produces a magnetic field

When two like poles come together what happens

They repel each other

When two unlike poles come together what happens

They attract to each other

The attraction and repulsion between two magnetic poles are both examples of

Non-Contact forces as they don’t have to touch to experience a force

What elements are commonly found in magnetic materials

Iron,steel,nickel and cobalt

What do permanent magnets produce

It’s own magnetic field

If we bring a permanent magnets close close to another permanent magnet what happens

Then they can attract or repel each other depending on the direction

What is a induced magnet

Are magnetic materials that becomes a magnetic force strongest when it’s placed in a magnetic field

What does Induced magnetism always cause

A force of attraction

What happens if we take away the permanent magnet from two induced magnets

Then the induced magnets lose most of all their magnetism quickly and stop producing a magnetic field

What are magnetically soft materials

Those that lose their magnetism quickly e.g Nickel and Iron

What are Magnetically hard materials

Those that lose their magnetism slowly e.g Steel

What is a magnetic field with example

A region around a magnet where a force acts on another magnet or on a magnetic material

E.g If we place a magnetic material such as iron into this field then it will experience a force of attraction towards the magnet

What does the strength of a magnetic field depend on

The distance from the magnet

How can the direction of a magnetic field be found

Using a compass

What does a magnetic compass contain

A small bar magnet

How can we plot a magnetic field we we place a compass near a bar magnet

1)Place compass near the North Pole of the bar magnet

2)Then draw a cross at the North Pole of the compass

3)Move compass, so the South Pole of the compass is on the cross and then draw another cross at North Pole of compass

4)We continue doing this until we have plotted a complete magnetic field line

5)Now we connect all the dots with a line and then show direction of the field line using an arrow so from North Pole to South Pole

6)Now we repeat this starting at different points around North Pole of bar magnet

The closer together the lines are in a magnetic field

Is where the field is strongest

How does the compass tell us that the Earth has its own magnetic field

Since the compass contains a small bar magnet if we hold the compass away from any magnets then the needle always points in the North-South direction

What is the Earths magnetic field due to

The Earths core

How would you draw magnetic fields for a magnet

Draw lines from north to south with arrows showing direction from north to south.

-Making sure on north side arrows are going out and in south side arrows are going in

How would you draw magnetic fields with two like poles next to each other

Draw the magnetic filed lines moving away like image below with arrows going same way

Describe the iron fillings method for drawing magnetic fields

1)Get a piece of paper and place two permanent magents under it making sure they don’t attract

2)Tap iron fillings onto the paper

3)Keep sprinkling until you see lines being show which represent magnetic field

4)Repeat with magnetics being a short distance between one another

5)Also use two like poles and two unlike