Answer the following Why would a train move faster using electromagnets? Where are magnets the strongest? Since we know the Aurora Borealis occurs because of magnetism, why do you think it only occurs in 2 places on earth?

Magnet Making and Breaking

Magnetic Domains Tiny fields of magnets normally go all directions When we can organize them in one direction we get magnetism

Magnet Types Two categories of magnetism – Temporary and Permanent Temporary Magnet – loses magnetism easily Permanent Magnet – Hard to magnetize, but keeps charge for a long time.

Permanent Magnets Ferromagnetic Materials – These type of magnets are going to have strong magnetic properties EXAMPLES: Iron, Nickel, cobalt, gadolinum, neodymium Metal alloy – ALNICO Aluminum, nickel, iron and cobalt Cheap and easy to make, very common Most common magnets nowadays are Ferrite Chips easy, but cheap and strong Think Fridge Magnets

Ferrofluids Liquids (Usually oils) mixed with magnetic materials that will react to magnetic fields FERROFLUID VIDEO (WATCH THIS)

Making a stronger magnet The better the domains are aligned – stronger the magnet MRI Machines are an example of very strong electromagnets being used for a specific purpose.