ANSWER THE FOLLOWING QUESTIONS:
1. Can the magnets the isolated? Explain in brief.
2. What do you mean by magnetism.
3. What are magnetic and nonmagnetic substances?
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4. How is the earth behaving like a magnet.
5. Describe in brief about the poles of magnet.
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Answers
Answer:
1. There is never an isolated pole (a monopole). All magnets attract iron, such as that in a refrigerator door. However, magnets may attract or repel other magnets. Experimentation shows that all magnets have two poles.
2. Definition of magnetism
a: a class of physical phenomena that include the attraction for iron observed in lodestone and a magnet, are inseparably associated with moving electricity, are exhibited by both magnets and electric currents, and are characterized by fields of force
b: a science that deals with magnetic phenomena
3. The materials which get attracted towards a magnet are magnetic – for example, iron, nickel or cobalt.
The materials which are not attracted towards a magnet are non-magnetic materials. Examples of non-magnetic materials include rubber, coins, feather and leather.
4. The Earth behaves like a magnet because the Earth is a magnet. It is not a permanent magnet, but an electromagnet. Deep in the Earth, molten metal (mostly iron) flows due to heat which causes convection. (The heat appears to be generated by iron condensing at the solid core.)
5. Magnetic pole, region at each end of a magnet where the external magnetic field is strongest. A bar magnet suspended in Earth's magnetic field orients itself in a north–south direction. Unlike poles of different magnets attract each other; like poles repel each other.