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Introduction | How,When and Where | History | Class 8th | Magnet Brains Video Lecture
FAQs on Introduction - How,When and Where - History - Class 8th - Magnet Brains Video Lecture
| 1. How do magnets work? |  |
Ans. Magnets work by creating a magnetic field around them. This magnetic field attracts or repels other magnets or magnetic materials. The force of attraction or repulsion is strongest at the poles of the magnet. When two magnets with opposite poles come close to each other, they attract each other. Similarly, when two magnets with the same pole come close, they repel each other.
| 2. When were magnets first discovered? | |
Ans. Magnets were first discovered in ancient times, around 2500 BCE, in the region of Magnesia (now known as Turkey). The first known magnets were naturally occurring minerals called lodestones. People noticed that these lodestones had a natural magnetic property and could attract iron. This discovery laid the foundation for the understanding and use of magnets.
| 3. What are the different types of magnets? | |
Ans. There are several types of magnets:
- Permanent magnets: These magnets retain their magnetic properties and do not lose their magnetism easily. Examples include lodestones and magnets made from materials like iron, nickel, and cobalt.
- Temporary magnets: These magnets are only magnetic when in the presence of a magnetic field. For example, when an iron nail is brought close to a permanent magnet, it becomes temporarily magnetic.
- Electromagnets: These magnets are created by passing an electric current through a coil of wire. The strength of the magnetic field can be controlled by varying the amount of current flowing through the coil.
| 4. How are magnets used in everyday life? | |
Ans. Magnets are used in various aspects of everyday life. Some common uses of magnets include:
- Refrigerator magnets: These are used to stick notes, pictures, and other lightweight items to the refrigerator door.
- Electric motors and generators: Magnets are used to create motion in electric motors and generators, which are essential in many appliances and machines, such as fans, washing machines, and power plants.
- Magnetic compasses: Magnets are used in compasses to determine direction. The needle of the compass aligns itself with the Earth's magnetic field, pointing towards the North Pole.
- Credit cards and ID cards: These cards often have magnetic strips on the back that store information, such as account details or personal identification.
| 5. Can magnets lose their magnetism over time? | |
Ans. Yes, magnets can lose their magnetism over time, but it depends on various factors. Permanent magnets can lose their magnetism if exposed to high temperatures, strong external magnetic fields, or physical damage. However, most magnets used in everyday applications, such as refrigerator magnets or magnets in electric motors, are designed to retain their magnetism for a long time without significant loss.
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