Page 1 - Lessone Notes- Making magnets
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SAI INTERNATIONAL SCHOOL

                                                        Class 6
                                                   Lesson Notes
                                                 Subject- Physics

                                       Ch. – Magnets and Their Effects
                                           Subtopic- Making Magnets



               Test for magnetism
                          Suggested activity
                        Take a magnet. Bring the north pole of the magnet closer to each and of the
                       metal bar. If the magnet attracts one end and repels the other, then the metal
                       bar is a magnet. If the magnet attracts both the ends of the metal bar, then the
                       metal bar is not a magnet. Thus, repulsion is the sure test of magnetism.
               Types of magnets
                         There are two types of magnets
                                      1.  Temporary magnet
                                      2.  Permanent  magnet
                          Temporary magnet
                             Magnets that retain their magnetic properties only for a short period of
                              time are called temporary magnets.
                             These magnets are usually made of iron, cobalt or nickel.
                          Permanent magnet
                             Magnets that retain their magnetic properties for a long period of time
                              are called permanent magnets.
                             Permanent magnets are made from mixtures of iron, cobalt or nickel
                              with other materials.
               Making magnets
               Magnets can be made by using few methods:
                 Single-touch method and Double touch method
                 Electric current is also used to make magnets.
               Magnetisation:The process of making a magnetic substance into a magnet is
               known as magnetisation.
               Single-Touch Method
                       In this method we use a bar magnet to make a permanent magnet from a
                       magnetic material.
               Suggested activity
               Place an iron bar that has to be magnetized on a non-magnetic surface such as
               wood. Take a bar magnet and place its north pole at one end of the iron bar. Drag
               the magnet slowly on the iron bar from its one end to the other, without lifting. Now,
               lift the magnet and bring it back to the start position. Repeat the process 30-40 times
               with same speed. Remove the bar magnet .Bring an iron nail near the iron bar to
               check if it has become a magnet. If not then repeat the process a few more times.
               Keep in mind not to change the poles of the magnet or the direction of movement.


               Double –Touch Method:
               In this method we use two bar magnets of equal strength to make a permanent
               magnet from a magnetic material. Ex: an iron bar
                            Take two magnets of the same size and strength.
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