Demagnetization of Magnets

Q.

Heating magnets enhance its magnetic property.

1. False

2. True

Q.

Heating a magnet to a very high temperature destroys its………..

Q. Write two methods by which a magnet can be demagnetised.

Q. Which of the following ways will NOT cause a permanent magnet to lose its magnetism?

1. Heating it strongly over a flame
2. Repeatedly hitting it with a hammer
3. Improper storage
4. Coating it with a layer of oil

Q. Write two methods by which a magnet can be demagnetised.

Q.

Point out two ways in which a magnet can be demagnetized.

Q. A mixture of iron and nickel can be easily magnetised, even in a weak field. Which results in the formation of a ________. Fill in the blank.

1. Permanent Magnet
2. Electromagnet
3. Temporary Magnet
4. None of the above

Q. Permanent magnetism are demagnetized by:

1. Heating
2. Hammering
3. Dropping from a height
4. Keeping in water

Q. A permanent magnet can be demagnetized by.

1. heating
2. washing
3. freezing
4. rubbing with metals

Q. Magnets which lose their magnetism on heating can regain their magnetic property, if they have not been heated to their Curie temperature.

1. False
2. True

Q. The magnet can be completely demagnetized by

1. Breaking the magnet into small pieces
2. Heating it slightly
3. Droping it into ice cold water
4. A reverse field of appropriate strength

Q.

Which of the following activities will result in the loss of magnetic properties?

1. By immersing a magnet in water at room temperature.

2. Heating

3. Hammering

4. Keeping a magnet idle for a long time

Q. Demagnetisation of magnets can be done by

1. Heating
2. All the above
3. Magnetising in the opposite direction
4. Rough handling

Q. Hammering a permanent magnet may cause it to lose its magnetism.

1. True
2. False