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Magnetic Properties

1. State two ways in which a magnet can get demagnetized.

2. State one advantage of the shape of a horseshoe magnet.

Long-Answer Questions

1. What is a magnet? What is meant by (a) magnetic materials, and (b) magnetic fields?

2. Why is repulsion a surer test of magnetism than attraction?

3. What is magnetic induction? Describe in detail how a steel needle can be magnetized by induction.

4. Explain the directional property of magnets. How do the poles of a magnet get their names? Describe one application of this property.

5. Describe a simple experiment by which we can get an idea about the shape of the magnetic field produced by a bar magnet. Make a sketch of the field.

6. What is an electromagnet? How is it different from a permanent magnet? Why is iron used as the core of an electromagnet?

7. How can a magnet lose its magnetism? How should magnets be stored so that they do not lose their magnetism gradually?

8. Distinguish between a permanent magnet and a temporary magnet. Mention two uses of each.

9. What causes the earth to behave as a magnet? Where are the poles of this imaginary magnet?



Answer :

GinnyAnswer

Final answer:

Magnets can be demagnetized by heating or shock, the horseshoe shape increases magnet strength, experiments can visualize magnetic fields, electromagnets differ from permanent magnets, and storing magnets properly prevents demagnetization.


Explanation:

Magnetism: A magnet exhibits attractive and repulsive forces due to its magnetic field. Magnetic materials are substances that can be magnetized, while magnetic fields are regions surrounding a magnet where its influence is felt.

Demagnetization of a Magnet: A magnet can be demagnetized by heating it beyond its Curie temperature or subjecting it to mechanical shock, disrupting its aligned magnetic domains.

Horseshoe Magnet Advantage: The horseshoe shape of a magnet increases its magnetic strength as the poles are closer together, concentrating the magnetic field.

Experimental Magnetism: To visualize a magnetic field, place a bar magnet underneath a paper and sprinkle iron filings. The filings align along the field lines, showing the field's shape.

Electromagnets vs. Permanent Magnets: Electromagnets use an electric current to generate a magnetic field and can be turned on and off, unlike permanent magnets which retain their magnetism.

Magnet Loss and Storage: Magnets can lose their magnetism due to high temperatures or physical shock. To prevent gradual loss, store them away from other magnets and heat sources.


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