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P7: Quiz 2 – Answers
P7: Quiz 2 – Answers
1)
a) Permanent magnets produce their own magnetic field all of the time
b) Induced magnets are magnetic materials that become magnetic when they are placed inside the magnetic field of another magnet
2)
a) A – south
B – north
b) A – north
B – south
c) Yes, magnetic materials are always attracted to permeant magnets
3)
a) It will lose it magnetism/ will demagnetise
b)
i) Magnetically soft materials lose their magnetism quite quickly. Iron and nickel iron alloys are examples
ii) Magnetically hard materials lose their magnetism quite slowly. Steel is an example
4) We place a permanent bar magnet next to both ends of all 3 of the blocks. The outcomes will be as follows:
a) Permanent magnets produce their own magnetic field all of the time
b) Induced magnets are magnetic materials that become magnetic when they are placed inside the magnetic field of another magnet
2)
a) A – south
B – north
b) A – north
B – south
c) Yes, magnetic materials are always attracted to permeant magnets
3)
a) It will lose it magnetism/ will demagnetise
b)
i) Magnetically soft materials lose their magnetism quite quickly. Iron and nickel iron alloys are examples
ii) Magnetically hard materials lose their magnetism quite slowly. Steel is an example
4) We place a permanent bar magnet next to both ends of all 3 of the blocks. The outcomes will be as follows:
- The non-magnetic material will never be attracted to the permeant magnet
- The magnetic material that is not magnetised will attracted to the permeant magnet for both ends as it will become an induced magnet for both ends
- The permanent magnet will be attracted to the permeant magnet for one end because opposite poles attract. It will then be repulsed for the other end because same poles repel.
Questions
1)
a) Give a definition of a permeant magnet.
b) Give a definition of an induced magnet.
2)
a) We place a magnetic material next to a permeant magnet. The poles of the permeant magnet are labelled on the diagram below. The ends of the magnetic material are labelled as A and B.
1)
a) Give a definition of a permeant magnet.
b) Give a definition of an induced magnet.
2)
a) We place a magnetic material next to a permeant magnet. The poles of the permeant magnet are labelled on the diagram below. The ends of the magnetic material are labelled as A and B.
What are the poles for ends A and B for the magnetic material?
b) We now flip the magnetic, so that the north pole is now on the left and the south pole is now on the right.
b) We now flip the magnetic, so that the north pole is now on the left and the south pole is now on the right.
What are the poles for ends A and B for the magnetic material?
c) Are magnetic materials always attracted to permeant magnets?
3)
a) When a magnetic material is placed in the magnetic field of a permeant magnet, it becomes magnetised and becomes an induced magnet. What will happen to the magnetism of the magnetic material when it is taken away from the permeant magnet?
b)
i) What does magnetically soft mean? Give an example of a magnetically soft material.
ii) What does magnetically hard mean? Give an example of a magnetically hard material.
4) I have 3 blocks. One of these blocks is a permeant magnet, the other is a magnetic material that is not magnetised and the final one is a non-magnetic material.
c) Are magnetic materials always attracted to permeant magnets?
3)
a) When a magnetic material is placed in the magnetic field of a permeant magnet, it becomes magnetised and becomes an induced magnet. What will happen to the magnetism of the magnetic material when it is taken away from the permeant magnet?
b)
i) What does magnetically soft mean? Give an example of a magnetically soft material.
ii) What does magnetically hard mean? Give an example of a magnetically hard material.
4) I have 3 blocks. One of these blocks is a permeant magnet, the other is a magnetic material that is not magnetised and the final one is a non-magnetic material.
How can determine which block is which if I have a permeant magnet?