9496860
Descripción
Fichas por Aaishah Din, actualizado hace más de 1 año
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Creado por Aaishah Din
hace más de 7 años
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| Pregunta | Respuesta |
| What 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. |
| What is the general rule of attractions between magnets? | Like poles repel, unlike poles attract. |
| What are magnetic materials? | Materials that are attracted to magnets. They include: → Iron → Nickel → Cobalt → steel |
| Define demagnetise. | To remove magnetism from a magnetic material. All magnetic materials CAN be demagnetised/magnetised. |
| Permanent magnets are made of steel, because . . . | . . . steel does not lose it's magnetism easily, unlike iron. |
| Define magnetic field. | The region around a magnet in which it's magnetic force is still effective. |
| What 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. |
| Plotting compasses showing the magnetic field | |
| Magnetic 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. |
| The further away the plotting compass is from the magnet, the _ _ _ _ _ _ the force of the field on the compass. | a) weaker. |
| Define 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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