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# MAGNETISM

Physics For XII

Instructed by Narender Singh
Validity: 120 days
Free

Published    07-Feb-2017      Bilingual

Magnetism is chapter-5 of NCERT and counts for 8 marks in exam. It covers the following as per the syllabus: Current loop as a magnetic dipole and its magnetic dipole moment. Magnetic dipole moment of a revolving electron. Magnetic field intensity( bar magnet) along its axis and perpendicular to its axis. Torque on a magnetic dipole( bar magnet) in the uniform magnetic field, bar magnet as an equivalent solenoid, magnetic field lines, Earth's magnetic field and magnetic element. Para-magnetic, dia-magnetic and ferro-magnetic substances with examples, Electromagnets and factors affecting their strength, permanent magnets.

Section 1: Magnetism (In this section you will learn about magnets and magnetism. It is a very important chapter. There will be about 3 questions 1 Very small type, 1 short answer type and one long answer type. In this chapter you will study magnetism, natural magnet, artificial magnet, properties of magnet, coulombs law, magnetic dipole, magnetic dipole moment, magnetic field due to magnetic dipole on axial line and equatorial line, torque acting on a magnetic dipole, potential energy due to magnetic dipole in a uniform magnetic field, current carrying loop, Gauss law in magnetism, magnetic moment of an atom, Earth's magnetism, magnetic meridian and Geographic meridian.)
Lecture 1 Magnetism (In this lecture you will learn what a magnet is, the different types of magnet and the properties of magnet. A magnet is a material that has both attractive and directive properties. The property of attraction is known as magnetism. The magnet when freely suspended, in the rest its north pole indicates the geographical north and south pole indicates geographical south. Horse shoe magnet, bar magnet, ball ended magnet are some of the artificial magnet. Magnetic Needle deflects when exposed to electricity. A Magnet posses following basic properties: 1) It has two poles. 2) It has attractive property. 3) It has directive property. 4) Like poles repel each other and unlike poles attract. 5) Magnetic poles always exist together. 6) Mono poles do not exist, every magnet exist in pairs. Magnetic Induction is the process by which any object or material is magnetized when exposed to some external magnetic field. Magnetic field is the space around a magnet within which its influence can be experienced is called magnetic field. Every magnet has its own axis and equator. Coulombs law of magnetic effect is very important in examination point of view. It states that the force of attraction and repulsion between two magnetic poles is directly proportional to the square of distance between them. A magnetic dipole is an arrangement of two equal and opposite magnetic pole separated by a small distance. You will even discuss the important questions asked in the board exam.)

#### Narender Singh

 Phone: 07********26 Email: nar********@gmail.com Address: C-9/31 SECTOR 15 ROHINI NEW DELHI Institute:

Hello Friends. I am Narender Singh Bobby. Faculty of Physics of Studykhazana. I will cover all the chapters of physics of Class XI and XII. I will provide you complete course with their mock test series with all the important questions. Moreover you can ask doubts or queries if any. I will always be their to help you.

##### Qualification

B.Sc Physics (H),B.ED

##### Biography

I AM TEACHING PHYSICS SINCE 2011