Magnets
- Created by: Shreya Kochhar
- Created on: 02-05-16 12:53
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- Magnets
- Magnetically hard materials retain their magnetism e.g. magnets
- Magnetically soft materials lose their magnetism e.g. iron
- All magnetic materials attract but only magnets repel
- Uniform = same strength
- Uniform magnetic field - between the opposite poles of two magnets placed close together
- To create a uniform magnetic field bring two poles close together then many field line will travel straight from one pole to the other
- Uniform magnetic field - between the opposite poles of two magnets placed close together
- Magnetic field line never cross as they only show direction of a force
- To show field lines place 2 magnets under a sheet of paper and sprinkle iron filings on to the top of the sheet
- The iron filings will arrange themselves into strings of filings along field lines
- Go north to south
- Earth's magnetic field is similar in shape to one around a magnet
- Caused by electric currents flowing through the molten outer core of the earth
- To show field lines place 2 magnets under a sheet of paper and sprinkle iron filings on to the top of the sheet
- When a soft magnet is brought near to a permanent magnet it is attached as it has magnetism induced in it
- The poll of a permanent magnet always induced the opposite pole in an unmagnetised piece of magnetic field
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