P7 - Magnetism and Electromagnetism

draw a magnetic field

what type of force is a magnetic one

non-contact

what does the distance between the lines of a magnetic field tell you

the closer together the lines are, the stronger the magnetic field.

draw the magnetic field for repulsion and attraction

how do compasses work

• inside a compass is a tiny bar magnet

• the north pole of this magnet is attracted to the south pole of any magnet it is near

• when they’re not near a magnet, compasses always point north because the earth generates its own magnetic field.

what are permanent and induced magnets

• permanent magnets produce their own magnetic field

• induced magnets are magnetic materials that turn into a magnet when they are put into a magnetic field.

magnetic materials

1. iron

2. steel

3. nickel

4. cobalt

right hand rule

used to find magnetic field of a wire.

what is a solenoid and how does it increase magnetic field strength

when a wire is warped into a coil.

the field lines round each loop line up with each other so there are lots of fields pointing in the same direction and they are very close together.

how to increase the strength of a solenoid

put a block of iron in the center of the coil, it becomes an induced magnet

what is the motor effect

when a conductor is put between magnetic poles, the field round the conductor interacts with the magnetic field it has been placed in. This causes the conductor and the magnet to exert a force on each other and can cause the conductor to move.

left hand rule