Скачать с ютуб NCERT Class 6 Science Chapter 13: Fun with Magnets- Magnetic Field & Lines,Poles,Compass (CBSE/NSO) в хорошем качестве

NCERT Class 6 Science Chapter 13: Fun with Magnets- Magnetic Field & Lines,Poles,Compass (CBSE/NSO)

SOF NSO - https://www.doorsteptutor.com/Exams/NSO/ NSTSE Preparation - https://www.doorsteptutor.com/Exams/N... CBSE: https://www.doorsteptutor.com/Exams/C... NTSE: https://www.doorsteptutor.com/Exams/N... Handouts @ https://www.examrace.com/Study-Materi... Story of magnetism started with Greek shepherd Magnus, iron end of whose stick got attracted to Loadstone. Magnetic & Non-Magnetic Materials ============================= Only certain materials respond to magnetism- they are called magnetic examples include iron, cobalt and nickel. Other materials which do not respond to magnetism are called non-magnetic. Magnetic Segregation ================== Difference in behavior between magnetic and non-magnetic materials is used to separate magnetic materials from non-magnetic. When magnet is brought near iron-filings- it is attracted to magnet leaving behind dust in the container. The same principle is used in junk-yards to separate iron scrap using magnets. Magnetic Poles & Properties of Magnetic Poles ===================================== All magnets have 2 poles designated as north and south. Like poles (S-S, N-N) repel each other Unlike poles (N-S) attract each other Magnetic Poles always exist in pairs- impossible to create a magnetic monopole. Compass and Earth's Magnetic Field ============================= Earth's magnetic field can be approximated by a giant bar magnet placed at its center with the south pole of bar magnet pointing towards the North geographic pole and the north pole of bar magnet pointing towards the south geographic pole. It is because of the Earth's magnetic field, a freely suspended bar magnet on Earth aligns itself in the N-S direction with its north pole pointing to the north geographic pole (where there is Earth's south magnetic pole). The north and south poles of magnet are thus also known as north seeking poles and south seeking poles respectively. The line joining the magnetic poles of Earth is called magnetic axis. The magnetic and geographic axis of Earth are misaligned by around 10 degrees. Working of Compass ================= Due to Earth's magnetic field a freely suspended magnet always aligns in N-S direction. Magnetic Field =========== The concept of magnetic field describes the magnitude and direction of the force experienced by a north pole when placed in the region of influence around a magnet. The magnitude of the magnetic field decreases as we move away from the magnet. The direction of the magnetic field is given by the direction of compass needle when placed near the magnet. We can plot the magnetic field direction around the magnet. When we join our plot we get magnetic field lines. Creating Magnets ======================================== We can create magnets by rubbing a piece of iron with magnet- this would take a while but would create relatively permanent magnet. Another way to create a relatively permanent magnet would be to keep the piece of iron in close proximity to a permanent magnet for a while. Spontaneous Magnetization | Magnetic Induction ======================================== Temporarily a piece of iron when kept near a magnet starts behaving like a magnet- this is known as spontaneous magnetization or magnetic induction. It happens because the presence of magnetic field causes the magnetic domains to temporarily align. Such magnetization is temporary and is lost as soon as external magnetic field is removed. Precautions while Handling Magnets ============================== Magnets lose their properties if they are heated, hammered or dropped from height. Proper Storage of Magnets ====================== Magnets become weak if they are not stored properly: Bar magnets should be kept in pairs with their unlike poles on the same side. They must be separated by a piece of wood while two pieces of soft iron should be placed across their ends. For horseshoe magnet, keep a piece of iron across the poles. Keep magnets away from cassettes, mobiles, television, music system, compact disks (CDs) and the computer. For Science Class 11-12 and important topics subscribe to DoorStepTutor:    / doorsteptutor   Chapters: 0:00 NCERT Class 6 Science Chapter 13: Fun with Magnets 0:03 Story of Magnetism 1:40 Magnetic and Non – Magnetic 2:39 Filtration or Segregation 3:35 Magnetic Poles & Their Properties 5:23 Compass & Earth’s Magnetic Field 9:33 Magnetic Field & Magnetic Field Lines 12:41 Magnetic Lines of Force 16:56 Creating Magnets 18:52 Preserving Magnets #science #funwithmagnets #magneticfield #lines #poles #compass #examrace nso, science, examrace, magnets, magnetic poles, compass, magnetic field, creating magnets, fun with magnets, magnet science experiments, magnet science lessons #NSO #NSTSE #Olympiad #NCERT #VVM #examrace #upsc #ugcnet