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15.1 - Electromagnetism
Karten in diesem Stapel (11)
- 1What is a magnetic compass?→ A magnetic compass is a tiny magnetic needle pivoted at it's centre.
→ One end always point North, the other, south. This is because of Earth's magnetic field. - 2What is the general rule of attractions between magnets?Like poles repel, unlike poles attract.
- 3What are magnetic materials?Materials that are attracted to magnets.
They include:
→ Iron
→ Nickel
→ Cobalt
→ steel - 4Define demagnetise.To remove magnetism from a magnetic material.
All magnetic materials CAN be demagnetised/magnetised. - 5Permanent magnets are made of steel, because . . .. . . steel does not lose it's magnetism easily, unlike iron.
- 6Define magnetic field.The region around a magnet in which it's magnetic force is still effective.
- 7What does a magnetic field look like, for a bar magnet? What can be used to show the shape of it?Iron filings are used to present the shape of a magnetic field. A plotting compass can be used, too.
- 8Plotting compasses showing the magnetic field
- 9Magnetic field lines are also known as lines of _ _ _ _ _ . The lines are most concentrated at the _ _ _ _ _, because the field is strongest there.a) Lines of force.
b) poles. - 10The further away the plotting compass is from the magnet, the _ _ _ _ _ _ the force of the field on the compass.a) weaker.
- 11Define induced magnetism.An unmagnetised magnetic material can be magnetised by placing it in a magnetic field. The magnetic field is said to "induce" magnetism on the material.
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- Flashcards based on 15.1 - physics. Hope they help :)
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- Aaishah Din
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