Pages in this set

Page 1

Preview of page 1
Magnetic fields

Bar magnets

If several plotting compasses are placed around a bar
magnet the needles will line up as shown

Page 2

Preview of page 2
The compass needles line up with the lines of the magnetic
field




The same magnetic field is generated when a current is
passed through a coil of wire




The Earth's dynamo

When a coil moves in a
magnetic field, a current is produced in the coil
This is the principal…

Page 3

Preview of page 3
These electrical currents produce the Earth's magnetic
fields
An electrical current is a flow of electrical charge
Moving electric charges can be thought of as having
electric currents
Since an electrical current has a magnetic field associated
with it, so moving electrical chargers have magnetic fields
associated with them




Solar…

Page 4

Preview of page 4
Cosmic rays

Cosmic rays, mostly from the sun can
interact with Earth's magnetic field
As they spiral around they lose energy
causing coloured light ­ aurora borealis
(the Northern Lights)
Extreme concentration of cosmic rays can
disrupt the National Grid, supply of
electricity, and it's satellite
communications

Cosmic rays are…

Page 5

Preview of page 5
Other stars
Supernova and their remnants
Distant galaxies

Cosmic ray particles are travelling very close to the speed
of light and have a lot of energy
The rays interact with Earth's magnetic field by spiralling
around the field lines




As a result there is a concentration of cosmic rats at…

Page 6

Preview of page 6
The moon

It is thought that two planet's collided




Then the heavier material forms the Earth (iron core)




And the lighter material forms a moon




Evidence for the origin of the Moon

Page 7

Preview of page 7
Earth has a large iron core but the Moon does not
This is because the iron in the Earth had already drained
into the core by the time the collision happened
The debris blown out for both Earth and the other planet
came from their iron-depleted mantles
The iron core…

Comments

No comments have yet been made

Similar Physics resources:

See all Physics resources »See all resources »