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MAGNETIC FIELD ARREST

Test and compare electrical insulators opposed to magnetic insulators

Suitable For

Grade 7

Difficulty

3

Time Required

 <24 Hours

Supervision

Advised

What’s it about?

All materials can conduct electrical current to varying degrees. ‘Insulators’ are materials that do not conduct electricity well, because their resistance is so high that current flow is blocked. Materials that do not allow magnetic fields to pass are called ‘magnetic insulators’.

A magnetic insulator shield magnetic fields, and do not let magnetism affect objects on the other side of the material. Is the same materials both good electrical insulators and magnetic insulators? Compare both the electrical and magnetic insulating ability of some materials in the following science experiment:

Topics covered

Insulator, Permeability

What will I need?

  • IRON FILINGS
  • CLAY BALLS
  • BAR MAGNET
  • OHMMETER
  • GLASS TEST TUBE
  • BROWN PAPER BAG
  • ALUMINIUM FOIL
  • PLASTIC SANDWICH BAG
  • IRON FRYING PAN
  • WATER
  • PENCIL
  • PAPER

Procedure (Method)

Unfortunately, this section is only available in the e-book version of the project.

How does it work?

Unfortunately, this section is only available in the e-book version of the project.

The electrons of different types of materials have different degrees of freedom to move around. Metals, for instance, has atoms that are so loosely bound that the electrons randomly move in the space between the atoms of that material. They are often called ‘free electrons’. Other types of materials such as glass, has densely packed atoms and electrons have very little freedom to move around. This mobility of electrons within a material is known as ‘electrical conductivity’. Materials with high electron mobility (many free electrons) are called conductors, while materials with low electron mobility (few or no free electrons) are called insulators.

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