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Misconceptions of Magnetism

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Stephen Wang

on 21 January 2013

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Transcript of Misconceptions of Magnetism

But why? Are all metals are attracted to magnets? Are larger magnets stronger than smaller magnets? Are magnets and electricity the same thing? Thanks For Watching! Magnetism
Misconceptions Correct, only ferromagnetic metals which are iron, nickel and cobalt (and their alloys) are attracted to magnets. A magnet is made up of many small magnets called dipoles (has two poles - north and south). When aligned, they produce a magnetic field/domain that attracts other ferromagnetic dipoles N S S N S N S N S N S N S N S N S N S N In a normal ferromagnetic material, the dipoles are scattered around and point in different directions. However, if it is in the presence of a magnetic field, they will align themselves to the direction of the field forming a temporary magnet. Before After Contact with magnetic field S N S N S N S N S N S N S N S N S N S N S N S N Most people think that they aren't, and they are... Yes No Yes No False, although it may seem that a larger magnet is stronger, all it means is that it has a larger magnetic field. Therefore, an object is only pulled to a larger magnet because it is in the field of the larger magnet and not the smaller one. Then how is the strength of a magnet determined?
The three factors that affect magnetic strength are material, dipole alignment and temperature.

Permanent magnets are made from one of these four materials: Neodymium Iron Boron, Samarium Cobalt, Alnico, and Ceramic/Ferrite. They are all rare earth magnets that are most commonly used. Dipole alignment is the arrangement of dipoles in an object. Partially aligned dipoles result in a weaker magnetic field produced by the object compared to a completely aligned magnet. S N S N S N S N S N S N S N S N stronger magnet weaker magnet Temperature affects magnets by increasing or decreasing the rate at which the atoms in dipoles flow. When exposed to higher heats, the particles will move faster causing the dipoles to lose their alignment and therefore reducing the magnetic strength S N S N S N S N S N S N S N S N heat Yes No While magnetism and electricity are similar, they are not the same. Electricity is the movement of electrons across atoms while magnetism is the attraction of dipoles. They are similar in the fact that
- they both can create magnetic fields
- attract opposites (North+South or Positive+Negative)
- repel likes (North+North or Positive+Positive) However, magnets do not require the movement of electrons to attract/repel another object.
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