1 Hard magnets are magnetic materials that
2 Alnico alloys are widely used nowadays as they
3 Soft magnetic materials can be
4 The industrial products of soft materials
5 Alnico alloys can
A operate at high temperatures.
B have a high Curie temperature.
C include pure iron, silicium-steels, and iron-nickel alloys.
D retain the magnetism after being magnetized.
E easily magnetized and demagnetized.
5 
Writing. Write the words in the correct order to form a question. Let your partner answer the questions according to the information given in the text.
1 name hard is of magnet a another what?
2 chromium what high did steel and replace carbon?
3 alloy temperature why at can high Alnico operate?
4 wide of why magnets applications have do range permanent?
5 peculiarity what soft the materials of magnetic is?
6 are magnetic composed soft what materials of?
7 AC is of applications what materials the magnetic soft difference DC and of?
Make a definition for each item in column A. Words from the column B can be used more than once.
Example: Permeability is the main characteristic for DC application.
| are applied in
materials
| a high Curie temperature
are easily magnetized and demagnetized
|
7 
Speaking task. Make a summary of Text 4 using the exercise above.
8 Speaking task. Prepare a report for a scientific conference about future application of hard/soft magnetic materials. While speaking use the following expressions.
To start/begin with
First of all
After this/that
Afterwards
Lastly
With reference to
According to
Owing to the fact that
Therefore
Consequently
As a result
Free Reading
The magnetic and electric fields are both similar and different. They are also inter-related.
Just as the positive (+) and negative (-) electrical charges attract each other, the N and S poles of a magnet attract each other.
In electricity like charges repel, and in magnetism like poles repel.
The magnetic field is a dipole field. That means that every magnet must have two poles.
On the other hand, a positive (+) or negative (-) electrical charge can stand alone. Electrical charges are called monopoles, since they can exist without the opposite charge.
Final test
