Magnets 2
Make Temporary Magnet
using Magnetic Material
Stroking
Electrical
Stroking a piece of magnetic material
with one pole of a magnet repeatedly,
in the SAME direction
Coil a wire around a magnetic rod
and pass electric current through the wire
to make the magnetic rod an electromagnet
How to measure magnetic strength
The more times the magnetic rod is stroked by the magnet,
the stronger the magnet
The stronger the magnetic strength of the magnet use to stroke the magnetic rod, the stronger the magnet
Ways to loose magnetic strength
bring the magnets equal distance away from some objects made of magnetic materials such as paper clips and see how many objects the magnet attract. the greater number of objects attracted, the stronger the magnetic strength of the magnet.
place a magnetic object such as a paper clip far away from a magnet. slowly push the magnetic material closer to the magnet until it is attracted and pulled over to the magnet. the further the distance the magnet can attract the magnetic object, the stronger its magnetic force.
the more number of batteries connected to the electromagnet,
the stronger the magnet
the more number of coils of wire around the electromagnet,
the stronger the magnet
drop the magnet on a hard surface from a height repeatedly.
hammer the magnet repeatedly.
heat the magnet with a strong flame
Uses
Storing information
Hold thing together
We use magnets to store information
in our credit cards, smart phones and computers
We use magnet to keep the doors of refrigerator shut
and keep doors open using magnetic door stops
Seperate magetic materials
from non-magnetic material
A conveyor belt with magnets
can separate magnetic materials from non-magnetic materials. This allow the magnetic materials to be collected and recycled
Produce
movement and sound
Electrical appliances that produces movement and motors
require magnets to work.
Applances that produces and record sounds
also require magnets to work
Finding direction
A compass is a needle that has been magnetised.
As a freely suspended magnet always come to rest
pointing to the north-south direction,
we use this property to find direction using a compass