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Questions and Answers
Which type of materials are easily magnetised but the induced magnetism is usually temporary?
Which type of materials are easily magnetised but the induced magnetism is usually temporary?
- Magnetically hard materials
- Iron-based materials
- Magnetically soft materials (correct)
- Alloy materials
What are the main elements used to create permanent magnets from magnetically hard materials?
What are the main elements used to create permanent magnets from magnetically hard materials?
- Copper, zinc, silver, gold, and platinum
- Iron, aluminium, nickel, cobalt, and rare earth elements (correct)
- Oxygen, nitrogen, carbon, hydrogen, and sulfur
- Lead, mercury, arsenic, cadmium, and antimony
What happens to magnetically hard materials when magnetised by a strong external magnetic field?
What happens to magnetically hard materials when magnetised by a strong external magnetic field?
- They lose their magnetism immediately
- They remain magnetised indefinitely (correct)
- They become temporarily magnetised
- They emit their own weak magnetic field
What can demagnetise magnetically hard materials?
What can demagnetise magnetically hard materials?
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Which type of materials are attracted by magnets and can be magnetised to create permanent magnets?
Which type of materials are attracted by magnets and can be magnetised to create permanent magnets?
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