magnetism class 8

introduction

1. CHAPTER 13 CLASS VIII MAGNETISM Prepared by SREELAKSHMI A GCTE TRIVANDRUM

2. MAGNETISM Magnetism is a class of physical phenomena that are mediated by magnetic fields. In simple words , we can say that magnetism is a force that can attract or repel objects that have a magnetic material like iron inside them.

3. TYPE OF MAGNETS 1.NATURAL MAGNETS Those directly obtained from nature. They are permanent magnets. T hey never lose magnetic power. 2.ARTIFICIAL MAGNETS They are made of alloys like alnico. They are either temporary or permanent magnets

4. PROPERTIES OF MAGNET A freely moving magnet align itself in the north south direction of the earth. The end of magnet pointing to the north is north pole (N ) and other end is south pole(S) .

5. Like poles repel each other and unlike poles attract each other. N-N or S-S Poles Repel N-S or S-N Poles Attract