{"id":120421,"date":"2022-03-16T08:30:14","date_gmt":"2022-03-16T03:00:14","guid":{"rendered":"https:\/\/www.aakash.ac.in\/blog\/?p=120421"},"modified":"2023-03-23T17:29:55","modified_gmt":"2023-03-23T11:59:55","slug":"cbse-board-class-12-important-notes-on-the-chapter-magnetism-and-matter","status":"publish","type":"post","link":"https:\/\/www.aakash.ac.in\/blog\/cbse-board-class-12-important-notes-on-the-chapter-magnetism-and-matter\/","title":{"rendered":"CBSE Board class 12: Important Notes on the Chapter Magnetism and Matter"},"content":{"rendered":"

Magnetic phenomena are found worldwide. Magnetic fields from several sources permeate throughout the universe, penetrating stars, planets, atoms, humans, and maybe extraterrestrial beings. Magnetism is prevalent on Earth even before the birth of humanity. The Earth’s magnetic field has been present from when Earth was formed. This article will focus on magnetism, its properties, certain laws of physics about magnetism, etc. All the topics covered in this article are from the CBSE class 12 board examination point of view. You can visit the CBSE Class 12th datasheet<\/a> which has been released.\u00a0<\/span><\/p>\n

History of Magnets<\/h2>\n

The word magnet comes from the Greek island of Magnesia, where magnetic metal reserves were discovered in the early 600 BC. Shepherds were stuck between the rocks when their iron-tipped rods were placed on the ground. Their shoes (the sole made of iron nails) suffered the same fate. The magnetic properties of the rocks made it tough for them to walk around.<\/span><\/p>\n

Curiosity Enough: The Chinese are largely credited for the technological application of magnets. Magnetic needles are mentioned in Chinese writings dating back to 400 BC. Magnetic needles were also used by caravans crossing the Gobi desert.<\/i><\/b><\/p>\n

Some Features of Magnets<\/h2>\n

The following are well-known magnetism concepts:<\/span><\/p>\n

The earth acts like a magnet, with its magnetic field extending roughly between geographical south and north.<\/span><\/p>\n

The magnet’s north pole is the tip that refers to the geographic north, while the south pole is the tip that refers to the geographic south.<\/span><\/p>\n

When two north poles or two south poles are placed near together, they repel each other. But the closed-loop pole of one magnet is placed next to the south pole of another magnet. They experience an attractive force.\u00a0<\/span><\/p>\n

A magnet’s north and south poles cannot be separated. When a bar magnet is split in half, two smaller bar magnets with weaker magnets are formed, with a north and a south pole. A magnet can never exist with one pole; hence magnetic monopoles are impossible.\u00a0<\/span><\/p>\n

Magnets can be made from iron and other ferromagnetic alloys.\u00a0<\/span><\/p>\n

Bar Magnet<\/a>: Definition and Properties<\/h2>\n

A bar magnet is one of the simplest magnets, which is a rectangular bar that points towards geographical North and South when suspended in free space.\u00a0<\/span><\/p>\n

The Magnetic Field Lines<\/b><\/p>\n

Do this at home. Take a bar magnet and place it under a thick sheet of paper. Sprinkle some iron filling on the paper and notice how a specific pattern draws on the paper. You will get a pattern similar to the image displayed below:<\/span><\/p>\n

You can draw the pattern of the magnetic field line using this pattern formed by iron fillings. You can say that magnetic field lines visualize how a magnetic field exists in a magnet. Listed below are some very important properties of magnetic field lines. Read them very carefully:<\/span><\/p>\n